RST Forum

BGP IPV6

BGP Initial Configuration

by

 

 

LAB9: BGP – IPv6

Disclaimer

This Configuration Guide is designed to assist members to enhance their skills in respective technology area.  While every effort has been made to ensure that all material is as complete and accurate as possible, the enclosed material is presented on an “as is” basis.  Neither the authors nor Forum assume any liability or responsibility to any person or entity with respect to loss or damages incurred from the information contained in this guide. This Lab Guide was developed by RSTForum.  Any similarities between material presented in this configuration guide and any other material is completely coincidental. 

LAB 9: Diagram

Note: This Lab was developed on Cisco IOS Version15.2(4) M1 ADVENTERPRISEK9-M.

 

LAB 9: Configure BGP FOR IPv6:

Task 1:  Configure IPv6 BGP process for Autonomous

  • In the configuration mode of router configure IPv6 BGP Process by following command:

 

R1:

router bgp 65100    ! (Initiate BGP process for AS 65100)

neighbor 22:0:1::2 remote-as 65000  ! (Creates a IPv6 BGP peer group)

neighbor 22:0:1::2 ebgp-multihop 5

neighbor 22:0:1::2 update- loopback 1  ! (To form loop to loop indirect peering

address-family ipv6    ! (Enable address family IPv6) 

neighbor 22:0:1::2 activate   ! (Enables the exchange of information

neighbor 22:0:1::2 soft-reconfiguration inboundwith IPv6 BGP neighboring router)

exit

 

R2:

router bgp 65000

neighbor 11:0:1::1 remote-as 65100

neighbor 11:0:1::1 ebgp-multihop 5  ! (IPv6 BGP connections to external 

neighbor 11:0:1::1 update-source loopback 1 peers residing on networks that are not  

neighbor 33:0:1::3 remote-as 65000  directly connected.)

neighbor 33:0:1::3 update-source loopback 1

address-family ipv6

neighbor 11:0:1::1 activate

neighbor 11:0:1::1 soft-reconfiguration inbound ! (To store fresh incoming updated 

neighbor 33:0:1::3 activate    from neighbor.)

neighbor 33:0:1::3 soft-reconfiguration inbound

exit

 

 

R3:

router bgp 65000

neighbor 44:0:1::4 remote-as 65200

neighbor 44:0:1::4 ebgp-multihop 5

neighbor 44:0:1::4 update-source loopback 1

neighbor 22:0:1::2 remote-as 65000

neighbor 22:0:1::2 update-source loopback 1

address-family ipv6

neighbor 44:0:1::4 activate

neighbor 44:0:1::4 soft-reconfiguration inbound

neighbor 22:0:1::2 activate

neighbor 22:0:1::2 soft-reconfiguration inbound

exit

 

R4:

router bgp 65200

neighbor 33:0:1::3 remote-as 65000

neighbor 33:0:1::3 ebgp-multihop 5

neighbor 33:0:1::3 update-source loopback 1

address-family ipv6

neighbor 33:0:1::3 activate

neighbor 33:0:1::3 soft-reconfiguration inbound

exit

 

 

  • In the configuration mode of router configure IPv4 OSPF Process by following command:

 

R1:

ipv6 router ospf 1  ! (Initiate IPv6 OSPF process with process id 1)

interface serial 2/0

ipv6 ospf 1 area 0  

interface loopback 1

ipv6 ospf 1 area 0

interface loopback 2

ipv6 ospf 1 area 0

interface loopback 3

ipv6 ospf 1 area 0

exit

 

R2:

ipv6 router ospf 1

interface serial 2/0

ipv6 ospf 1 area 0

interface ethernet 0/0

ipv6 ospf 1 area 0

interface loopback 1

ipv6 ospf 1 area 0

interface loopback 2

ipv6 ospf 1 area 0

interface loopback 3

ipv6 ospf 1 area 0

exit

 

R3:

ipv6 router ospf 1

interface serial2/0

ipv6 ospf 1 area 0

interface ethernet 0/0

ipv6 ospf 1 area 0

interface loopback 1

ipv6 ospf 1 area 0

interface loopback 2

ipv6 ospf 1 area 0

interface loopback 3

ipv6 ospf 1 area 0

exit

 

R4:

ipv6 router ospf 1

interface serial 2/0

ipv6 ospf 1 area 0

interface loopback 1

ipv6 ospf 1 area 0

interface loopback 2

ipv6 ospf 1 area 0

interface loopback 3

ipv6 ospf 1 area 0

exit

 

 

  • Announce the network in BGP Process

 

R1:

router bgp 65100

address-family ipv6  ! (Enable address family for IPv6 BGP.)

network 11:0:1::0/64  ! (Announce the network in BGP process.)

network 11:0:2::0/64

network 11:0:3::0/64

exit

 

R2:

router bgp 65000

address-family ipv6

network 22:0:1::0/64

network 22:0:2::0/64

network 22:0:3::0/64

exit

 

R3:

router bgp 65000

address-family ipv6

network 33:0:1::0/64

network 33:0:2::0/64

network 33:0:3::0/64

exit

 

R4:

router bgp 65200

address-family ipv6

network 44:0:1::0/64

network 44:0:2::0/64

network 44:0:3::0/64

exit

 

Task 2:  Verification:

  • Verify IPv6 OSPF routes by following command:

 

 R2#show ipv6 route

! (Shows router’s routing table and IPv6 routes entries.)

 

IPv6 Routing Table - default - 30 entries

Codes: C - Connected, L - Local, S - Static, U - Per-user Static route

       B - BGP, HA - Home Agent, MR - Mobile Router, R - RIP

       H - NHRP, I1 - ISIS L1, I2 - ISIS L2, IA - ISIS interarea

       IS - ISIS summary, D - EIGRP, EX - EIGRP external, NM - NEMO

       ND - ND Default, NDp - ND Prefix, DCE - Destination, NDr - Redirect

       O - OSPF Intra, OI - OSPF Inter, OE1 - OSPF ext 1, OE2 - OSPF ext 2

       ON1 - OSPF NSSA ext 1, ON2 - OSPF NSSA ext 2, l - LISP

B   11:0:1::/64 [20/0]

     via 11:0:1::1

O   11:0:1::1/128 [110/64]

     via FE80::A8BB:CCFF:FE00:100, Serial2/0

B   11:0:2::/64 [20/0]

     via 11:0:1::1

O   11:0:2::1/128 [110/64]

     via FE80::A8BB:CCFF:FE00:100, Serial2/0

B   11:0:3::/64 [20/0]

     via 11:0:1::1

O   11:0:3::1/128 [110/64]

     via FE80::A8BB:CCFF:FE00:100, Serial2/0

C   12::/64 [0/0]

     via Serial2/0, directly connected

L   12::A8BB:CCFF:FE00:200/128 [0/0]

     via Serial2/0, receive

C   22:0:1::/64 [0/0]

     via Loopback1, directly connected

L   22:0:1::2/128 [0/0]

     via Loopback1, receive

C   22:0:2::/64 [0/0]

     via Loopback2, directly connected

L   22:0:2::2/128 [0/0]

     via Loopback2, receive

C   22:0:3::/64 [0/0]

     via Loopback3, directly connected

L   22:0:3::2/128 [0/0]

     via Loopback3, receive

C   23::/64 [0/0]

     via Ethernet0/0, directly connected

L   23::A8BB:CCFF:FE00:200/128 [0/0]

     via Ethernet0/0, receive

B   33:0:1::/64 [200/0]

     via 33:0:1::3

O   33:0:1::3/128 [110/10]

     via FE80::A8BB:CCFF:FE00:300, Ethernet0/0

B   33:0:2::/64 [200/0]

     via 33:0:1::3

O   33:0:2::3/128 [110/10]

     via FE80::A8BB:CCFF:FE00:300, Ethernet0/0

B   33:0:3::/64 [200/0]

     via 33:0:1::3

O   33:0:3::3/128 [110/10]

     via FE80::A8BB:CCFF:FE00:300, Ethernet0/0

O   34::/64 [110/74]

     via FE80::A8BB:CCFF:FE00:300, Ethernet0/0

B   44:0:1::/64 [200/0]

     via 44:0:1::4

O   44:0:1::4/128 [110/74]

     via FE80::A8BB:CCFF:FE00:300, Ethernet0/0

B   44:0:2::/64 [200/0]

     via 44:0:1::4

O   44:0:2::4/128 [110/74]

     via FE80::A8BB:CCFF:FE00:300, Ethernet0/0

B   44:0:3::/64 [200/0]

     via 44:0:1::4

O   44:0:3::4/128 [110/74]

     via FE80::A8BB:CCFF:FE00:300, Ethernet0/0

L   FF00::/8 [0/0]

     via Null0, receive

 

 

  • Verify IPv6 BGP neighborship and its details by following command:

 

BGP neighbor states:

  • Idle – TCP connectivity issue

  • Active – Command configuration issue

  • Established – TCP connectivity established

 

R2#show bgp ipv6 unicast neighbor

! (show details of IPv6bgp neighbor)

 

BGP neighbor is 11:0:1::1,  remote AS 65100, external link

  BGP version 4, remote router ID 11.0.3.1

  BGP state = Established, up for 00:00:54

  Last read 00:00:02, last write 00:00:02, hold time is 180, keepalive interval is 60 seconds

  Neighbor sessions:

    1 active, is not multisession capable (disabled)

  Neighbor capabilities:

    Route refresh: advertised and received(new)

    Four-octets ASN Capability: advertised and received

    Address family IPv6 Unicast: advertised and received

    Enhanced Refresh Capability: advertised and received

    Multisession Capability:

    Stateful switchover support enabled: NO for session 1

  Message statistics:

    InQ depth is 0

    OutQ depth is 0

 

                         Sent       Rcvd

    Opens:                  1          1

    Notifications:          0          0

    Updates:                0          2

    Keepalives:             2          2

    Route Refresh:          0          0

    Total:                  3          5

  Default minimum time between advertisement runs is 30 seconds

 

 For address family: IPv6 Unicast

  Session: 11:0:1::1

  BGP table version 1, neighbor version 1/0

  Output queue size : 0

  Index 1, Advertise bit 0

  1 update-group member

  Slow-peer detection is disabled

  Slow-peer split-update-group dynamic is disabled

                                 Sent       Rcvd

  Prefix activity:               ----       ----

    Prefixes Current:               0          3 (Consumes 264 bytes)

    Prefixes Total:                 0          3

    Implicit Withdraw:              0          0

    Explicit Withdraw:              0          0

    Used as bestpath:             n/a          0

    Used as multipath:            n/a          0

 

                                   Outbound    Inbound

  Local Policy Denied Prefixes:    --------    -------

    Total:                                0          0

  Number of NLRIs in the update sent: max 0, min 0

  Last detected as dynamic slow peer: never

  Dynamic slow peer recovered: never

  Refresh Epoch: 1

  Last Sent Refresh Start-of-rib: never

  Last Sent Refresh End-of-rib: never

  Last Received Refresh Start-of-rib: never

  Last Received Refresh End-of-rib: never

                                       Sent       Rcvd

        Refresh activity:              ----       ----

          Refresh Start-of-RIB          0          0

          Refresh End-of-RIB            0          0

 

  Address tracking is enabled, the RIB does have a route to 11:0:1::1

  Connections established 1; dropped 0

  Last reset never

  External BGP neighbor may be up to 5 hops away.

  Transport(tcp) path-mtu-discovery is enabled

  Graceful-Restart is disabled

Connection state is ESTAB, I/O status: 1, unread input bytes: 0

Connection is ECN Disabled, Mininum incoming TTL 0, Outgoing TTL 5

Local host: 22:0:1::2, Local port: 38536

Foreign host: 11:0:1::1, Foreign port: 179

Connection tableid (VRF): 0

Maximum output segment queue size: 50

 

Enqueued packets for retransmit: 0, input: 0  mis-ordered: 0 (0 bytes)

 

Event Timers (current time is 0x138C7):

Timer          Starts    Wakeups            Next

Retrans             4          0             0x0

TimeWait            0          0             0x0

AckHold             3          0             0x0

SendWnd             0          0             0x0

KeepAlive           0          0             0x0

GiveUp              0          0             0x0

PmtuAger            1          0         0x98CA5

DeadWait            0          0             0x0

Linger              0          0             0x0

ProcessQ            0          0             0x0

 

iss:  535224739  snduna:  535224835  sndnxt:  535224835

irs: 2503198340  rcvnxt: 2503198559

 

sndwnd:  16289  scale:      0  maxrcvwnd:  16384

rcvwnd:  16166  scale:      0  delrcvwnd:    218

 

SRTT: 413 ms, RTTO: 3205 ms, RTV: 2792 ms, KRTT: 0 ms

minRTT: 9 ms, maxRTT: 1000 ms, ACK hold: 200 ms

Status Flags: active open

Option Flags: nagle, path mtu capable

IP Precedence value : 6

 

Datagrams (max data segment is 1440 bytes):

Rcvd: 8 (out of order: 0), with data: 4, total data bytes: 218

Sent: 7 (retransmit: 0, fastretransmit: 0, partialack: 0, Second Congestion: 0), with data: 7, total data bytes: 383

 

 Packets received in fast path: 0, fast processed: 0, slow path: 0

 fast lock acquisition failures: 0, slow path: 0

TCP Semaphore      0xB2CF0E64  FREE

 

BGP neighbor is 33:0:1::3,  remote AS 65000, internal link

  BGP version 4, remote router ID 33.0.3.3

  BGP state = Established, up for 00:00:16

  Last read 00:00:16, last write 00:00:16, hold time is 180, keepalive interval is 60 seconds

  Neighbor sessions:

    1 active, is not multisession capable (disabled)

  Neighbor capabilities:

    Route refresh: advertised and received(new)

    Four-octets ASN Capability: advertised and received

    Address family IPv6 Unicast: advertised and received

    Enhanced Refresh Capability: advertised and received

    Multisession Capability:

    Stateful switchover support enabled: NO for session 1

  Message statistics:

    InQ depth is 0

    OutQ depth is 0

 

                         Sent       Rcvd

    Opens:                  1          1

    Notifications:          0          0

    Updates:                0          0

    Keepalives:             1          1

    Route Refresh:          0          0

    Total:                  2          2

  Default minimum time between advertisement runs is 0 seconds

 

 For address family: IPv6 Unicast

  Session: 33:0:1::3

  BGP table version 1, neighbor version 1/0

  Output queue size : 0

  Index 2, Advertise bit 1

  2 update-group member

  Slow-peer detection is disabled

  Slow-peer split-update-group dynamic is disabled

                                 Sent       Rcvd

  Prefix activity:               ----       ----

    Prefixes Current:               0          0

    Prefixes Total:                 0          0

    Implicit Withdraw:              0          0

    Explicit Withdraw:              0          0

    Used as bestpath:             n/a          0

    Used as multipath:            n/a          0

 

                                   Outbound    Inbound

  Local Policy Denied Prefixes:    --------    -------

    Total:                                0          0

  Number of NLRIs in the update sent: max 0, min 0

  Last detected as dynamic slow peer: never

  Dynamic slow peer recovered: never

  Refresh Epoch: 1

  Last Sent Refresh Start-of-rib: never

  Last Sent Refresh End-of-rib: never

  Last Received Refresh Start-of-rib: never

  Last Received Refresh End-of-rib: never

                                       Sent       Rcvd

        Refresh activity:              ----       ----

          Refresh Start-of-RIB          0          0

          Refresh End-of-RIB            0          0

 

  Address tracking is enabled, the RIB does have a route to 33:0:1::3

  Connections established 1; dropped 0

  Last reset never

  Transport(tcp) path-mtu-discovery is enabled

  Graceful-Restart is disabled

Connection state is ESTAB, I/O status: 1, unread input bytes: 0

Connection is ECN Disabled, Mininum incoming TTL 0, Outgoing TTL 255

Local host: 22:0:1::2, Local port: 54981

Foreign host: 33:0:1::3, Foreign port: 179

Connection tableid (VRF): 0

Maximum output segment queue size: 50

 

Enqueued packets for retransmit: 0, input: 0  mis-ordered: 0 (0 bytes)

 

Event Timers (current time is 0x138C8):

Timer          Starts    Wakeups            Next

Retrans             3          0             0x0

TimeWait            0          0             0x0

AckHold             2          0             0x0

SendWnd             0          0             0x0

KeepAlive           0          0             0x0

GiveUp              0          0             0x0

PmtuAger            1          0         0xA2119

DeadWait            0          0             0x0

Linger              0          0             0x0

ProcessQ            0          0             0x0

 

iss: 3435553471  snduna: 3435553548  sndnxt: 3435553548

irs:  180299801  rcvnxt:  180299878

 

sndwnd:  16308  scale:      0  maxrcvwnd:  16384

rcvwnd:  16308  scale:      0  delrcvwnd:     76

 

SRTT: 330 ms, RTTO: 3159 ms, RTV: 2829 ms, KRTT: 0 ms

minRTT: 0 ms, maxRTT: 1000 ms, ACK hold: 200 ms

Status Flags: active open

Option Flags: nagle, path mtu capable

IP Precedence value : 6

 

Datagrams (max data segment is 1440 bytes):

Rcvd: 5 (out of order: 0), with data: 2, total data bytes: 76

Sent: 5 (retransmit: 0, fastretransmit: 0, partialack: 0, Second Congestion: 0), with data: 5, total data bytes: 284

 

 Packets received in fast path: 0, fast processed: 0, slow path: 0

 fast lock acquisition failures: 0, slow path: 0

TCP Semaphore      0xB3C42AC4  FREE

 

  • Verify IPv6 BGP routes and its details by following command:

 

R2#show bgp ipv6 unicast

! (Shows IPv6 BGP table where “>” shows best path.)

 

BGP table version is 13, local router ID is 22.0.3.2

Status codes: s suppressed, d damped, h history, * valid, > best, i - internal,

 

              r RIB-failure, S Stale, m multipath, b backup-path, f RT-Filter,

              x best-external, a additional-path, c RIB-compressed,

Origin codes: i - IGP, e - EGP, ? - incomplete

RPKI validation codes: V valid, I invalid, N Not found

 

     Network             Next Hop            Metric    LocPrf    Weight    Path

 *>  11:0:1::/64      11:0:1::1                0                              0            65100 i

 *>  11:0:2::/64      11:0:1::1                0                              0            65100 i

 *>  11:0:3::/64      11:0:1::1                0                              0            65100 i

 *>  22:0:1::/64      ::                            0                              32768        i

 *>  22:0:2::/64      ::                            0                              32768        i

 *>  22:0:3::/64      ::                            0                              32768        i

 *>i 33:0:1::/64      33:0:1::3                0              100        0                  i

 *>i 33:0:2::/64      33:0:1::3                0              100        0                  i

 *>i 33:0:3::/64      33:0:1::3                0              100        0                  i

 *>i 44:0:1::/64      44:0:1::4                0              100        0            65200 i

 *>i 44:0:2::/64      44:0:1::4                0              100        0            65200 i

 *>i 44:0:3::/64      44:0:1::4                0              100        0            65200 i

 

 

 

 

 

BGP AS-PATH Attributes

by

 

 

LAB10: BGP – IPv6

Disclaimer

This Configuration Guide is designed to assist members to enhance their skills in respective technology area.  While every effort has been made to ensure that all material is as complete and accurate as possible, the enclosed material is presented on an “as is” basis.  Neither the authors nor Forum assume any liability or responsibility to any person or entity with respect to loss or damages incurred from the information contained in this guide. This Lab Guide was developed by RSTForum.  Any similarities between material presented in this configuration guide and any other material is completely coincidental.

 

LAB 10: Diagram

Note: This Lab was developed on Cisco IOS Version15.2(4) M1 ADVENTERPRISEK9-M. 

 

LAB 10: Configure IPv6 BGP AS-PATH Attributes

Task 1: Configure BGP IPv6 AS-PATH Attributes for Autonomous

  • In the configuration mode of router configure Ipv6 BGP AS-PATH Attributes by following command:

 

R1:

interface loopback 100

ipv6 ospf 1 area 0

ipv6 address 100::1/64

exit

router bgp 65100

address-family ipv6

network 100::/64

exit

 

R4:

interface loopback 100

ipv6 ospf 1 area 0

ipv6 address 100::4/64

exit

router bgp 65200

address-family ipv6

network 100::/64

exit

 

 

  • Verify IPv6 BGP routes by following command:

 

R2#show bgp ipv6 unicast 

(Shows IPv6 bgp table where “>” shows best path.)

 

BGP table version is 14, local router ID is 22.0.3.2

Status codes: s suppressed, d damped, h history, * valid, > best, i - internal,

 

              r RIB-failure, S Stale, m multipath, b backup-path, f RT-Filter,

              x best-external, a additional-path, c RIB-compressed,

Origin codes: i - IGP, e - EGP, ? - incomplete

RPKI validation codes: V valid, I invalid, N Not found

 

     Network             Next Hop            Metric     LocPrf     Weight    Path

 *>  11:0:1::/64      11:0:1::1                 0                                 0         65100 i

 *>  11:0:2::/64      11:0:1::1                 0                                 0         65100 i

 *>  11:0:3::/64      11:0:1::1                 0                                 0         65100 i

 *>  22:0:1::/64      ::                            0                             32768     i

 *>  22:0:2::/64      ::                            0                             32768     i

 *>  22:0:3::/64      ::                            0                             32768     i

 *>i 33:0:1::/64      33:0:1::3                0              100               0        i

 *>i 33:0:2::/64      33:0:1::3                0              100               0        i

 *>i 33:0:3::/64      33:0:1::3                0              100               0        i

 *>i 44:0:1::/64      44:0:1::4                0              100               0        65200 i

 *>i 44:0:2::/64      44:0:1::4                0              100               0        65200 i

 *>i 44:0:3::/64      44:0:1::4                0              100               0        65200 i

 * i 100::/64            44:0:1::4                     0                 100                  0        65200 i

 *>                              11:0:1::1                     0                                           0        65100 i

 

 

(R2 can reach 100 network via next hop 11:0:1::1 through AS 65100 and via 44:0:1::4 through AS 65200.Best path for R2 to reach 100 network is via net hop 11:0:1::1 because 11:0:1::1 is EBGP neighbor with AD value 20 and 44:0:1::4 is received from IBGP neighbor with AD value 200.)

 

 

Task 2: Configure BGP AS-PATH Manipulation for Autonomous

 

  • Prepend AS for as-path manipulation

! (Router R2 wants to make via 44:0:1::4 as best path instead of 11:0:1::1)

 

R2:

router bgp 65000

address-family ipv6

neighbor 11:0:1::1 route-map abc in

exit

exit

route-map abc permit 10

set as-path prepend 222 22

exit

 

(A policy is call on Router R2 that 100 network is prepended 222 22 via 11:0:1::1 through AS 65100 222 22 i.e. through 3 AS.)

 

R1:

router bgp 65100

address-family ipv6

neighbor 22:0:1::2 route-map abc out

exit

exit

route-map abc permit 10

set as-path prepend 111 11

exit

 

(A policy is call on Router R2 that 100 network is prepended 111 11 via 11:0:1::1 through AS 111 11 65100 i.e. through 3 AS.) 

 

  • Verify IPv4 BGP routes by following command:

 

R2# show bgp ipv6 unicast

 

BGP table version is 18, local router ID is 22.0.3.2

Status codes: s suppressed, d damped, h history, * valid, > best, i - internal,

 

              r RIB-failure, S Stale, m multipath, b backup-path, f RT-Filter,

              x best-external, a additional-path, c RIB-compressed,

Origin codes: i - IGP, e - EGP, ? - incomplete

RPKI validation codes: V valid, I invalid, N Not found

 

     Network             Next Hop          Metric    LocPrf    Weight    Path

 *>  11:0:1::/64      11:0:1::1                0                              0        222 22 65100 i

 *>  11:0:2::/64      11:0:1::1                0                              0        222 22 65100 i

 *>  11:0:3::/64      11:0:1::1                0                              0        222 22 65100 i

 *>  22:0:1::/64      ::                           0                          32768    i

 *>  22:0:2::/64      ::                           0                          32768    i

 *>  22:0:3::/64      ::                           0                          32768    i

 *>i 33:0:1::/64      33:0:1::3                0          100             0         i

 *>i 33:0:2::/64      33:0:1::3                0          100             0         i

 *>i 33:0:3::/64      33:0:1::3                0          100             0         i

 *>i 44:0:1::/64      44:0:1::4                0          100             0        65200 i

 *>i 44:0:2::/64      44:0:1::4                0          100             0        65200 i

 *>i 44:0:3::/64      44:0:1::4                0          100             0        65200 i

 *>i 100::/64            44:0:1::4                   0           100               0        65200 i

 *                                  11:0:1::1                   0                                 0        222 22 65100 111 11 i

 

 

(Router R2 now selects 44:0:1::4 as best path because it can reach 100 network through As 65200, where as to reach 100 network via 11:0:1::1 through AS 222 22 65100 111 11

Hence AS-PATH is manipulated.)

 

 

 

 

 

 

 

 

BGP Local Preference Attributes

by

 

LAB11: BGP – IPv6

Disclaimer

This Configuration Guide is designed to assist members to enhance their skills in respective technology area.  While every effort has been made to ensure that all material is as complete and accurate as possible, the enclosed material is presented on an “as is” basis.  Neither the authors nor Forum assume any liability or responsibility to any person or entity with respect to loss or damages incurred from the information contained in this guide. This Lab Guide was developed by RSTForum.  Any similarities between material presented in this configuration guide and any other material is completely coincidental.

 

LAB 11: Diagram

Note: This Lab was developed on Cisco IOS Version15.2(4) M1 ADVENTERPRISEK9-M. 

 

LAB 11: Configure IPv6 BGP Local Preference   Attributes

Task 1: Configure IPv6 BGP Local Preference Attributes for Autonomous

  • In the configuration mode of router configure BGP Local Preference Attributes by following command:

 

R2:

router bgp 65000

address-family ipv6

neighbor 11:0:1::1 route-map xyz in

exit

exit

route-map xyz permit 10

set local-preference 5000

exit

 

(A policy is call on Router R2 that to reach 100 network via 11:0:1::1 through AS 65000 preference is set 5000.)

 

R1:

router bgp 65100

address-family ipv6

neighbor 22:0:1::2 route-map xyz out

exit

exit

route-map xyz permit 10

set local-preference 10000

exit

 

(A policy is call on Router R1 that to reach 100 network via 22:0:1::2 through AS 65100 preference is set 10000.)

 

  • Verify IPv6 BGP routes by following command

 

R2#show bgp ipv6 unicast

 

BGP table version is 29, local router ID is 22.0.3.2

Status codes: s suppressed, d damped, h history, * valid, > best, i - internal,

              r RIB-failure, S Stale, m multipath, b backup-path, f RT-Filter,

              x best-external, a additional-path, c RIB-compressed,

Origin codes: i - IGP, e - EGP, ? - incomplete

RPKI validation codes: V valid, I invalid, N Not found

 

 

     Network             Next Hop          Metric    LocPrf    Weight    Path

 *>  11:0:1::/64      11:0:1::1                0          5000          0         65100 i

 *>  11:0:2::/64      11:0:1::1                0          5000          0         65100 i

 *>  11:0:3::/64      11:0:1::1                0         5000          0          65100 i

 *>  22:0:1::/64      ::                             0                         32768     i

 *>  22:0:2::/64      ::                             0                         32768     i

 *>  22:0:3::/64      ::                             0                         32768     i

 *>i 33:0:1::/64      33:0:1::3                0          100             0          i

 *>i 33:0:2::/64      33:0:1::3                0          100             0          i

 *>i 33:0:3::/64      33:0:1::3                0          100             0          i

 *>i 44:0:1::/64      44:0:1::4                0          100             0         65200 i

 *>i 44:0:2::/64      44:0:1::4                0          100             0         65200 i

 *>i 44:0:3::/64      44:0:1::4                0          100             0         65200 i

 *>  100::/64            11:0:1::1                      0          5000           0        65100 i

 

(Local Preference is by default 100 which is seen only on IBGP neighbor 

Local Preference is Local to an Autonomous. It is non-transitive parameter and is stripped of when routes are moving from one AS to another AS. 

 

R2 - Router R2 now selects 11:0:1::1 as best path because it can reach 100 network through As 65200 with Local Preference 5000, where as to reach 100 network via 44:0:1::4 through AS 65200 with Local Preference 100

Hence path is manipulated with help of Local Preference.

We as an Administrator changed the decision of Router R2 to reach 100:: network via 44:0:1::4 to path via 11:0:1::1 as best path. Therefore it shows only one path in its BGP Table and is ironically known as Sukhiram.)

 

R3# show bgp ipv6 unicast

 

BGP table version is 29, local router ID is 33.0.3.3

Status codes: s suppressed, d damped, h history, * valid, > best, i - internal,

              r RIB-failure, S Stale, m multipath, b backup-path, f RT-Filter,

              x best-external, a additional-path, c RIB-compressed,

Origin codes: i - IGP, e - EGP, ? - incomplete

RPKI validation codes: V valid, I invalid, N Not found

     Network             Next Hop           Metric     LocPrf    Weight    Path

 *>i 11:0:1::/64      11:0:1::1                0            5000          0         65100 i

 *>i 11:0:2::/64      11:0:1::1                0            5000          0         65100 i

 *>i 11:0:3::/64      11:0:1::1                0            5000          0         65100 i

 *>i 22:0:1::/64      22:0:1::2                0             100           0          i

 *>i 22:0:2::/64      22:0:1::2                0             100           0          i

 *>i 22:0:3::/64      22:0:1::2                0             100           0          i

 *>  33:0:1::/64      ::                               0                           32768     i

 *>  33:0:2::/64      ::                               0                           32768     i

 *>  33:0:3::/64      ::                               0                           32768     i

 *>  44:0:1::/64      44:0:1::4                0                                0         65200 i

 *>  44:0:2::/64      44:0:1::4                0                                0         65200 i

 *>  44:0:3::/64      44:0:1::4                0                                0         65200 i

 *>i 100::/64          11:0:1::1                0            5000           0         65100 i

 *                             44:0:1::4                    0                                0         65200 i

 

(R3 - As Local Preference is Local to an Autonomous and R3 belongs to same Autonomous, therefore Router R3 will also select best path as 11:0:1::1 but will show both the path in its BGP table and is ironically known as Dukhiram )

 

 

 

 

 

 

 

 

 

 

 

 

BGP Community String

by

 

 

LAB15: BGP – IPv6

Disclaimer

This Configuration Guide is designed to assist members to enhance their skills in respective technology area.  While every effort has been made to ensure that all material is as complete and accurate as possible, the enclosed material is presented on an “as is” basis.  Neither the authors nor Forum assume any liability or responsibility to any person or entity with respect to loss or damages incurred from the information contained in this guide. This Lab Guide was developed by RSTForum.  Any similarities between material presented in this configuration guide and any other material is completely coincidental.

 

LAB 15: Diagram

Note: This Lab was developed on Cisco IOS Version15.2(4) M1 ADVENTERPRISEK9-M. 

LAB 15: IPv6 BGP Community String:  

 

Task 1: Configure IPv6 BGP Community String 

 

  • In the configuration mode of router configure Community String Attributes by following command:

 

R1:

router bgp 65100

address-family ipv6

neighbor 22:0:1::2 send-community

neighbor 22:0:1::2 route-map bbb out

exit

route-map bbb permit 10

set community 8888

exit

 

 

  • Verify receipt of route in neighbor router’s by following command

 

R2#show bgp ipv6 unicast community

 

BGP table version is 1, local router ID is 22.0.3.2

Status codes: s suppressed, d damped, h history, * valid, > best, i - internal,

 

              r RIB-failure, S Stale, m multipath, b backup-path, f RT-Filter,

              x best-external, a additional-path, c RIB-compressed,

Origin codes: i - IGP, e - EGP, ? - incomplete

RPKI validation codes: V valid, I invalid, N Not found

 

     Network            Next Hop            Metric    LocPrf    Weight    Path

*>  11:0:1::/64      11:0:1::1                 0                         0      65100 i

*>  11:0:2::/64      11:0:1::1                 0                         0      65100 i

*>  11:0:3::/64      11:0:1::1                 0                         0         65100 i

 

R2#show ip bgp community 8888

 

BGP table version is 20, local router ID is 22.0.3.2

Status codes: s suppressed, d damped, h history, * valid, > best, i - internal,

 

              r RIB-failure, S Stale, m multipath, b backup-path, f RT-Filter,

              x best-external, a additional-path, c RIB-compressed,

Origin codes: i - IGP, e - EGP, ? - incomplete

RPKI validation codes: V valid, I invalid, N Not found

     Network            Next Hop            Metric    LocPrf    Weight    Path

*>  11:0:1::/64      11:0:1::1                 0                       0        65100 i

*>  11:0:2::/64      11:0:1::1                 0                         0         65100 i

*>  11:0:3::/64      11:0:1::1                 0                         0         65100 i

 

R2#show bgp ipv6 unicast 11:0:1::0/64

 

BGP routing table entry for 11:0:1::/64, version 2

Paths: (1 available, best #1, table default)

Advertised to update-groups:     2

Refresh Epoch 2

65100, (received & used)

11:0:1::1 (metric 64) from 11:0:1::1 (11.0.3.1)

Origin IGP, metric 0, localpref 100, valid, external, best

Community: 8888

 

(11 network is tagged 8888 community.)

 

 

Task 2: Configure IPv6 BGP Community String Manipulation 

 

  • In the configuration mode of router configure Community String Manipulation by following command:

 

R2:

router bgp 65000

address-family ipv6

neighbor 11:0:1::1 route-map bbb in

exit

ip community-list 1 permit 8888

route-map bbb permit 10

match community 1

set weight 9999

exit

 

 

  • Verify receipt of route in neighbor router’s by following command

 

R2#show bgp ipv6 unicast community

 

BGP table version is 16, local router ID is 22.0.3.2

Status codes: s suppressed, d damped, h history, * valid, > best, i - internal,

 

              r RIB-failure, S Stale, m multipath, b backup-path, f RT-Filter,

              x best-external, a additional-path, c RIB-compressed,

Origin codes: i - IGP, e - EGP, ? - incomplete

RPKI validation codes: V valid, I invalid, N Not found

 

     Network             Next Hop            Metric    LocPrf    Weight   Path

*>  11:0:1::/64      11:0:1::1                0                   9999     65100 i

*>  11:0:2::/64      11:0:1::1                0                   9999     65100 i

*>  11:0:3::/64      11:0:1::1                0                   9999     65100 i

 

 

R2#show bgp ipv6 unicast

 

BGP table version is 16, local router ID is 22.0.3.2

Status codes: s suppressed, d damped, h history, * valid, > best, i - internal,

 

              r RIB-failure, S Stale, m multipath, b backup-path, f RT-Filter,

              x best-external, a additional-path, c RIB-compressed,

Origin codes: i - IGP, e - EGP, ? - incomplete

RPKI validation codes: V valid, I invalid, N Not found

 

     Network             Next Hop            Metric    LocPrf    Weight    Path

*>  11:0:1::/64      11:0:1::1                  0                    9999      65100 i

*>  11:0:2::/64      11:0:1::1                  0                    9999      65100 i

*>  11:0:3::/64      11:0:1::1                       0                         9999       65100 i

*>  22:0:1::/64      ::                             0                  32768      i

*>  22:0:2::/64      ::                             0                    32768       i

*>  22:0:3::/64      ::                             0                    32768       i

*>i 33:0:1::/64      33:0:1::3                 0          100           0          i

*>i 33:0:2::/64      33:0:1::3                 0             100           0          i

*>i 33:0:3::/64      33:0:1::3                 0          100           0          i

*>i 44:0:1::/64      44:0:1::4                 0             100           0         65200 i

*>i 44:0:2::/64      44:0:1::4                 0             100           0         65200 i

*>i 44:0:3::/64      44:0:1::4                 0             100           0         65200 i

 

(Policy is called to match only 8888 community and will change weight attribute to 9999. Hence manipulation is achieved with the help of Community String.)

 

 

 

 

 

 

 

 

 

 

 

 

BGP MED Attributes

by

Disclaimer
This Configuration Guide is designed to assist members to enhance their skills in particular technology area. While every effort has been made to ensure that all material is as complete and accurate as possible, the enclosed material is presented on an “as is” basis. Neither the authors nor Forum assume any liability or responsibility to any person or entity with respect to loss or damages incurred from the information contained in this guide. This configuration guide was developed by Forum. Any similarities between material presented in this configuration guide and any other material is completely coincidental.

Cisco IOS Software, Linux Software (I86BI_LINUX-ADVENTERPRISEK9-M), Version 15.2(4)M1, DEVELOPMENT TEST SOFTWARE

ipv6-bgp-med-attributes-007

Lab created for RST Forum by: Yash Muni, Ritesh Gohil.

 

LAB 12: Configure IPv6 BGP MED Attributes:

Task 1: Configure IPv6 BGP MED Attributes for Autonomous

Step 1: In the configuration mode of router configure IPv6 BGP MED Attributes by following command
R1:
interface serial 2/3
ipv6 address 13::1/64
ipv6 ospf 1 area 0
no shutdown
exit
router bgp 65100
neighbor 13::3 remote-as 65000
address-family ipv6
neighbor 13::3 activate
neighbor 13::3 soft-reconfiguration inbound
exit
R2:
interface serial 2/3
ipv6 address 24::2/64
ipv6 ospf 1 area 0
no shutdown
exit
router bgp 65000
neighbor 24::4 remote-as 65200
address-family ipv6
neighbor 24::4 activate
neighbor 24::4 soft-reconfiguration inbound
exit
R3:
interface s2/3
ipv6 address 13::3/64
ipv6 ospf 1 area 0
no shutdown
exit
router bgp 65000
neighbor 13::1 remote-as 65100
address-family ipv6
neighbor 13::1 activate
neighbor 13::1 soft-reconfiguration inbound
exit
R4:
interface serial 2/3
ipv6 address 24::4/64
ipv6 ospf 1 area 0
no shutdown
exit
router bgp 65200
neighbor 24::2 remote-as 65000
address-family ipv6
neighbor 24::2 activate
neighbor 24::2 soft-reconfiguration inbound
exit
Step 2: Verify IPv4 BGP routes by following command

R1#show bgp ipv6 unicast
BGP table version is 22, local router ID is 11.0.3.1
Status codes: s suppressed, d damped, h history, * valid, > best, i – internal, r RIB-failure, S Stale, m multipath, b backup-path, f RT-Filter, x best-external, a additional-path, c RIB-compressed,

Origin codes: i – IGP, e – EGP, ? – incomplete
RPKI validation codes: V valid, I invalid, N Not found

Network Next Hop Metric LocPrf Weight Path
*> 11:0:1::/64 :: 0 32768 i
*> 11:0:2::/64 :: 0 32768 i
*> 11:0:3::/64 :: 0 32768 i
*> 22:0:1::/64 13::3 0 65000 i
* 22:0:1::2 0 0 65000 i
*> 22:0:2::/64 13::3     0 65000 i 
* 22:0:1::2 0   0 65000 i 
*> 22:0:3::/64 13::3 0 65000 i
* 22:0:1::2 0 0 65000 i
*> 33:0:1::/64 13::3 0 0 65000 i
* 22:0:1::2 0 65000 i
*> 33:0:2::/64 13::3 0 0 65000 i
* 22:0:1::2 0 65000 i
*> 33:0:3::/64 13::3 0 0 65000 i
* 22:0:1::2 65000 i
*> 44:0:1::/64 13::3 65000 65200 i
* 22:0:1::2 65000 65200 i
*> 44:0:2::/64 13::3 65000 65200 i
* 22:0:1::2 65000 65200 i
*> 44:0:3::/64 13::3 65000 65200 i
* 22:0:1::2 65000 65200 i

MED is local to a router and it is use to change router’s decision when it receives multiple path from same AS.

Router R1 can reach 22:0:2::0 via 22:0:1::2 and via 13::3 through AS 65000 i.e. Router R1 has multiple path to reach AS 65000. But Router R1 will select path via 13::3 as best path because MED select directly connected path as best path when having multiple exit. Therefore MED selects 13::3 as best directly connected to reach R2 as best path as 13::3 is directly connected.

R4#show bgp ipv6 unicast
BGP table version is 22, local router ID is 44.0.3.4
Status codes: s suppressed, d damped, h history, * valid, > best, i – internal, r RIB-failure, S Stale, m multipath, b backup-path, f RT-Filter, x best-external, a additional-path, c RIB-compressed,

Origin codes: i – IGP, e – EGP, ? – incomplete
RPKI validation codes: V valid, I invalid, N Not found

Network Next Hop Metric LocPrf Weight Path
*> 11:0:1::/64 24::2 32768 65000 65100 i
* 33:0:1::3 0 65000 65100 i
*> 11:0:2::/64 24::2 32768 65000 65100 i
* 33:0:1::3 0 65000 65100 i
*> 11:0:3::/64 24::2 32768 65000 65100 i
* 33:0:1::3 65000 i
*> 22:0:1::/64 24::2 0 0 65000 i
* 33:0:1::3 0 65000 i
*> 22:0:2::/64 24::2 0   0 65000 i 
* 33:0:1::3   0 65000 i 
*> 22:0:3::/64 24::2 0 0 65000 i
* 33:0:1::3 0 65000 i
*> 33:0:1::/64 24::2 0 65000 i
* 33:0:1::3 0 0 65000 i
*> 33:0:2::/64 24::2 0 65000 i
* 33:0:1::3 0 0 65000 i
*> 33:0:3::/64 24::2 0 65000 i
* 33:0:1::3 0 65000 i
*> 44:0:1::/64 :: 0  32768 i
*> 44:0:2::/64 :: 0  32768 i
*> 44:0:3::/64 :: 0  32768 i

Router R4 can reach 11:0:2::0 via 33:0:1::3 and via 24::2 through AS 65000 65100 i.e. Router R4 has multiple path to reach AS 65000. But Router R1 will select path via 24::2 as best path because MED select directly connected path as best path when having multiple exit. Therefore MED selects 24::2 as best directly connected to reach R2 as best path as 24::2 is directly connected.

Task 2: Configure BGP Selective Manipulation using MED for Autonomous

Step 1: In the configuration mode of router configure BGP Selective Manipulation using MED by following command
R1:
router bgp 65100
address-family ipv6
neighbor 13::3 route-map iii in
exit
route-map iii permit 10
match ipv6 address uuu
set metric 5000
exit
route-map iii permit 20
ipv6 access-list uuu
permit 22:0:2::/64 any
exit
Step 2: Verify IPv6 BGP route by following command

R1#show bgp ipv6 unicast
BGP table version is 41, local router ID is 11.0.3.1
Status codes: s suppressed, d damped, h history, * valid, > best, i – internal, r RIB-failure, S Stale, m multipath, b backup-path, f RT-Filter, x best-external, a additional-path, c RIB-compressed,

Origin codes: i – IGP, e – EGP, ? – incomplete
RPKI validation codes: V valid, I invalid, N Not found

Network Next Hop Metric LocPrf Weight Path
*> 11:0:1::/64 :: 0 32768 i
*> 11:0:2::/64 :: 0 32768 i
*> 11:0:3::/64 :: 0 32768 i
*> 22:0:1::/64 13::3 0 65000 i
* 22:0:1::2 0 0 65000 i
*> 22:0:2::/64 13::3     5000 65000 i 
* 22:0:1::2 0   0 65000 i 
*> 22:0:3::/64 13::3 0 65000 i
* 22:0:1::2 0 0 65000 i
*> 33:0:1::/64 13::3 0 0 65000 i
* 22:0:1::2 0 65000 i
*> 33:0:2::/64 13::3 0 0 65000 i
* 22:0:1::2 0 65000 i
*> 33:0:3::/64 13::3 0 0 65000 i
*> 33:0:1::/64 13::3 0 0 65000 i
* 22:0:1::2 65000 i
*> 33:0:2::/64 13::3 0 0 65000 i
*  22:0:1::2 65000 i
*> 33:0:3::/64  13::3  0  0 65000 i
*   22:0:1::2 65000 i
*> 44:0:1::/64 13::3 65000 65200 i
* 22:0:1::2 65000 65200 i
*> 44:0:2::/64 13::3 65000 65200 i
* 22:0:1::2 65000 65200 i
*> 44:0:3::/64 13::3 65000 65200 i
* 22:0:1::2 65000 65200 i

Router R1 can now reach 22:0:2:: via 22:0:1::2. This is done by calling route map policy in which selective route 22:0:2::0 only will set 13::3 metric 5000 and rest all routes will select their best path via 13::3. Hence Selective Route Manipulation is done. as well as Individual routes to other routers.

BGP Summarization

by

 

 

LAB13: BGP – IPv6

Disclaimer

This Configuration Guide is designed to assist members to enhance their skills in respective technology area.  While every effort has been made to ensure that all material is as complete and accurate as possible, the enclosed material is presented on an “as is” basis.  Neither the authors nor Forum assume any liability or responsibility to any person or entity with respect to loss or damages incurred from the information contained in this guide. This Lab Guide was developed by RSTForum.  Any similarities between material presented in this configuration guide and any other material is completely coincidental.

 

LAB 13: Diagram

Note: This Lab was developed on Cisco IOS Version15.2(4) M1 ADVENTERPRISEK9-M.