OSPF

LAB17: OSPF – IPv4

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 17: Diagram

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

LAB 3: OSPF Summarization on ASBR 

Task 1: Configure IPv4 OSPF Summarization 

• In the configuration mode of router configure 4 loopbacks with network address in sequence 

R1:

interface loopback 100

ip address 100.0.0.1 255.255.255.0

exit

interface loopback 101 

ip address 100.0.1.1 255.255.255.0

exit

interface loopback 102 

ip address 100.0.2.1 255.255.255.0

exit

interface loopback 103 

ip address 100.0.3.1 255.255.255.0

exit

Step 2  Redistribute external 100 network on ASBR.

R1:

router ospf 1

redistribute connected subnets

(Redistributed connected will redistribute its connected network. Subnet will allow classless routes in OSPF process.)

Step 3  Verify routes on neighbor router routing table

R2#show ip route

! (Shows router’s routing table and IPv4 entries)

Codes: L – local, C – connected, S – static, R – RIP, M – mobile, B – BGP

       D – EIGRP, EX – EIGRP external, O – OSPF, IA – OSPF inter area

       N1 – OSPF NSSA external type 1, N2 – OSPF NSSA external type 2

       E1 – OSPF external type 1, E2 – OSPF external type 2

       i – IS-IS, su – IS-IS summary, L1 – IS-IS level-1, L2 – IS-IS level-2

       ia – IS-IS inter area, * - candidate default, U – per-user static route

       o – ODR, P – periodic downloaded static route, H – NHRP, l – LISP

       + - replicated route, % - next hop override

Gateway of last resort is not set

      11.0.0.0/32 is subnetted, 3 subnets

O        11.0.1.1 [110/65] via 12.0.0.1, 00:15:52, Serial2/0

O        11.0.2.1 [110/65] via 12.0.0.1, 00:15:52, Serial2/0

O        11.0.3.1 [110/65] via 12.0.0.1, 00:15:52, Serial2/0

      12.0.0.0/8 is variably subnetted, 2 subnets, 2 masks

C        12.0.0.0/24 is directly connected, Serial2/0

L        12.0.0.2/32 is directly connected, Serial2/0

      22.0.0.0/8 is variably subnetted, 6 subnets, 2 masks

C        22.0.1.0/24 is directly connected, Loopback1

L        22.0.1.2/32 is directly connected, Loopback1

C        22.0.2.0/24 is directly connected, Loopback2

L        22.0.2.2/32 is directly connected, Loopback2

C        22.0.3.0/24 is directly connected, Loopback3

L        22.0.3.2/32 is directly connected, Loopback3

      23.0.0.0/8 is variably subnetted, 2 subnets, 2 masks

C        23.0.0.0/24 is directly connected, Ethernet0/0

L        23.0.0.2/32 is directly connected, Ethernet0/0

      33.0.0.0/32 is subnetted, 3 subnets

O        33.0.1.3 [110/11] via 23.0.0.3, 00:15:10, Ethernet0/0

O        33.0.2.3 [110/11] via 23.0.0.3, 00:15:10, Ethernet0/0

O        33.0.3.3 [110/11] via 23.0.0.3, 00:15:10, Ethernet0/0

      34.0.0.0/24 is subnetted, 1 subnets

O IA     34.0.0.0 [110/74] via 23.0.0.3, 00:15:10, Ethernet0/0

      44.0.0.0/32 is subnetted, 3 subnets

O IA     44.0.1.4 [110/75] via 23.0.0.3, 00:15:10, Ethernet0/0

O IA     44.0.2.4 [110/75] via 23.0.0.3, 00:15:10, Ethernet0/0

O IA     44.0.3.4 [110/75] via 23.0.0.3, 00:15:10, Ethernet0/0

      100.0.0.0/24 is subnetted, 4 subnets

O E2     100.0.0.0 [110/20] via 12.0.0.1, 00:00:53, Serial2/0

O E2     100.0.1.0 [110/20] via 12.0.0.1, 00:00:58, Serial2/0

O E2     100.0.2.0 [110/20] via 12.0.0.1, 00:00:58, Serial2/0

O E2     100.0.3.0 [110/20] via 12.0.0.1, 00:00:58, Serial2/0

(E2 means External route type 2, in which will not change cost after every hop throughout the OSPF.)

Step 4   Summarize external routes on ASBR router

! (In external route summary is always done on Autonomous System Border Router (ASBR))

R1:

router ospf 1

summary-address 100.0.0.0 255.255.252.0

exit

Task 2:  Verification

• Verify receipt of summary route in neighbor routing table & verify creation of null interface in routing table by following command:

R1#show ip route

Codes: L - local, C - connected, S - static, R - RIP, M - mobile, B - BGP

       D - EIGRP, EX - EIGRP external, O - OSPF, IA - OSPF inter area

       N1 - OSPF NSSA external type 1, N2 - OSPF NSSA external type 2

       E1 - OSPF external type 1, E2 - OSPF external type 2

       i - IS-IS, su - IS-IS summary, L1 - IS-IS level-1, L2 - IS-IS level-2

       ia - IS-IS inter area, * - candidate default, U - per-user static route

       o - ODR, P - periodic downloaded static route, H - NHRP, l - LISP

       + - replicated route, % - next hop override

Gateway of last resort is not set

      11.0.0.0/8 is variably subnetted, 6 subnets, 2 masks

C        11.0.1.0/24 is directly connected, Loopback1

L        11.0.1.1/32 is directly connected, Loopback1

C        11.0.2.0/24 is directly connected, Loopback2

L        11.0.2.1/32 is directly connected, Loopback2

C        11.0.3.0/24 is directly connected, Loopback3

L        11.0.3.1/32 is directly connected, Loopback3

      12.0.0.0/8 is variably subnetted, 2 subnets, 2 masks

C        12.0.0.0/24 is directly connected, Serial2/0

L        12.0.0.1/32 is directly connected, Serial2/0

      22.0.0.0/32 is subnetted, 3 subnets

O IA     22.0.1.2 [110/65] via 12.0.0.2, 00:29:15, Serial2/0

O IA     22.0.2.2 [110/65] via 12.0.0.2, 00:29:15, Serial2/0

O IA     22.0.3.2 [110/65] via 12.0.0.2, 00:29:15, Serial2/0

      23.0.0.0/24 is subnetted, 1 subnets

O IA     23.0.0.0 [110/74] via 12.0.0.2, 00:29:15, Serial2/0

      33.0.0.0/32 is subnetted, 3 subnets

O IA     33.0.1.3 [110/75] via 12.0.0.2, 00:28:33, Serial2/0

O IA     33.0.2.3 [110/75] via 12.0.0.2, 00:28:33, Serial2/0

O IA     33.0.3.3 [110/75] via 12.0.0.2, 00:28:33, Serial2/0

      34.0.0.0/24 is subnetted, 1 subnets

O IA     34.0.0.0 [110/138] via 12.0.0.2, 00:28:33, Serial2/0

      44.0.0.0/32 is subnetted, 3 subnets

O IA     44.0.1.4 [110/139] via 12.0.0.2, 00:28:33, Serial2/0

O IA     44.0.2.4 [110/139] via 12.0.0.2, 00:28:33, Serial2/0

O IA     44.0.3.4 [110/139] via 12.0.0.2, 00:28:33, Serial2/0

      100.0.0.0/8 is variably subnetted, 9 subnets, 3 masks

O        100.0.0.0/22 is a summary, 00:00:05, Null0

C        100.0.0.0/24 is directly connected, Loopback100

L        100.0.0.1/32 is directly connected, Loopback100

C        100.0.1.0/24 is directly connected, Loopback101

L        100.0.1.1/32 is directly connected, Loopback101

C        100.0.2.0/24 is directly connected, Loopback102

L        100.0.2.1/32 is directly connected, Loopback102

C        100.0.3.0/24 is directly connected, Loopback103

L        100.0.3.1/32 is directly connected, Loopback103

(When summarization is configured on a router; same router immediately created a routing point to Null 0 for loop prevention.)

R2#show ip route

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

Codes: L - local, C - connected, S - static, R - RIP, M - mobile, B - BGP

       D - EIGRP, EX - EIGRP external, O - OSPF, IA - OSPF inter area

       N1 - OSPF NSSA external type 1, N2 - OSPF NSSA external type 2

       E1 - OSPF external type 1, E2 - OSPF external type 2

       i - IS-IS, su - IS-IS summary, L1 - IS-IS level-1, L2 - IS-IS level-2

       ia - IS-IS inter area, * - candidate default, U - per-user static route

       o - ODR, P - periodic downloaded static route, H - NHRP, l - LISP

       + - replicated route, % - next hop override

Gateway of last resort is not set

      11.0.0.0/32 is subnetted, 3 subnets

O        11.0.1.1 [110/65] via 12.0.0.1, 00:29:30, Serial2/0

O        11.0.2.1 [110/65] via 12.0.0.1, 00:29:30, Serial2/0

O        11.0.3.1 [110/65] via 12.0.0.1, 00:29:30, Serial2/0

      12.0.0.0/8 is variably subnetted, 2 subnets, 2 masks

C        12.0.0.0/24 is directly connected, Serial2/0

L        12.0.0.2/32 is directly connected, Serial2/0

      22.0.0.0/8 is variably subnetted, 6 subnets, 2 masks

C        22.0.1.0/24 is directly connected, Loopback1

L        22.0.1.2/32 is directly connected, Loopback1

C        22.0.2.0/24 is directly connected, Loopback2

L        22.0.2.2/32 is directly connected, Loopback2

C        22.0.3.0/24 is directly connected, Loopback3

L        22.0.3.2/32 is directly connected, Loopback3

      23.0.0.0/8 is variably subnetted, 2 subnets, 2 masks

C        23.0.0.0/24 is directly connected, Ethernet0/0

L        23.0.0.2/32 is directly connected, Ethernet0/0

      33.0.0.0/32 is subnetted, 3 subnets

O        33.0.1.3 [110/11] via 23.0.0.3, 00:28:48, Ethernet0/0

O        33.0.2.3 [110/11] via 23.0.0.3, 00:28:48, Ethernet0/0

O        33.0.3.3 [110/11] via 23.0.0.3, 00:28:48, Ethernet0/0

      34.0.0.0/24 is subnetted, 1 subnets

O IA     34.0.0.0 [110/74] via 23.0.0.3, 00:28:48, Ethernet0/0

      44.0.0.0/32 is subnetted, 3 subnets

O IA     44.0.1.4 [110/75] via 23.0.0.3, 00:28:48, Ethernet0/0

O IA     44.0.2.4 [110/75] via 23.0.0.3, 00:28:48, Ethernet0/0

O IA     44.0.3.4 [110/75] via 23.0.0.3, 00:28:48, Ethernet0/0

      100.0.0.0/22 is subnetted, 1 subnets

O E2     100.0.0.0 [110/20] via 12.0.0.1, 00:00:15, Serial2/0

(Summarized routes are received from external route.)

LAB18: OSPF – 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 18: Diagram

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

LAB 18: IPv6 OSPF Summarization on ASBR

Task 1: Configure IPv6 OSPF Summarization 

• In the configuration mode of router configure 4 loopbacks with network address in sequence 

R1:

interface loopback 100 

ipv6 address 100:0:0::1/64

exit

interface loopback 101

ipv6 address 100:0:1::1/64

exit

interface loopback 102

ipv6 address 100:0:2::1/64

exit

interface loopback 103

ipv6 address 100:0:3::1/64

exit

Step 2   Redistribute external 100 network on ASBR.

R1:

ipv6 router ospf 1

redistribute connected subnets

exit

(Redistributed connected will redistribute its connected network. Subnet will allow classless routes in OSPF process.)

Step 3  Verify routes on neighbor router routing table

 R2#show ipv6 route

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

IPv6 Routing Table - default - 26 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

O   11:0:1::1/128 [110/64]

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

O   11:0:2::1/128 [110/64]

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

O   11:0:3::1/128 [110/64]

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

O   12::/61 [110/128]

     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

O   33:0:1::3/128 [110/10]

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

O   33:0:2::3/128 [110/10]

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

O   33:0:3::3/128 [110/10]

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

OI  34::/64 [110/74]

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

OI  44:0:1::4/128 [110/74]

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

OI  44:0:2::4/128 [110/74]

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

OI  44:0:3::4/128 [110/74]

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

OE2 100::/64 [110/20]

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

OE2 100:0:1::/64 [110/20]

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

OE2 100:0:2::/64 [110/20]

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

OE2 100:0:3::/64 [110/20]

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

L   FF00::/8 [0/0]

     via Null0, receive

(E2 means External route type 2, in which will not change cost after every hop throughout the OSPF.)

Step 4   Summarize external routes on ASBR router

! (In external route summary is always done on Autonomous System Border Router (ASBR))

R1:

ipv6 router ospf 1

summary-prefix 100::/16

exit

Task 2:  Verification

• Verify receipt of summary route in neighbor routing table & verify creation of null interface in routing table by following command:

R1#show ipv6 route

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

C   11:0:1::/64 [0/0]

     via Loopback1, directly connected

L   11:0:1::1/128 [0/0]

     via Loopback1, receive

C   11:0:2::/64 [0/0]

     via Loopback2, directly connected

L   11:0:2::1/128 [0/0]

     via Loopback2, receive

C   11:0:3::/64 [0/0]

     via Loopback3, directly connected

L   11:0:3::1/128 [0/0]

     via Loopback3, receive

C   12::/61 [0/0]

     via Serial2/0, directly connected

O   12::/64 [110/128]

     via FE80::A8BB:CCFF:FE00:200, Serial2/0

L   12::A8BB:CCFF:FE00:100/128 [0/0]

     via Serial2/0, receive

OI  22:0:1::2/128 [110/64]

     via FE80::A8BB:CCFF:FE00:200, Serial2/0

OI  22:0:2::2/128 [110/64]

     via FE80::A8BB:CCFF:FE00:200, Serial2/0

OI  22:0:3::2/128 [110/64]

     via FE80::A8BB:CCFF:FE00:200, Serial2/0

OI  23::/64 [110/74]

     via FE80::A8BB:CCFF:FE00:200, Serial2/0

OI  33:0:1::3/128 [110/74]

     via FE80::A8BB:CCFF:FE00:200, Serial2/0

OI  33:0:2::3/128 [110/74]

     via FE80::A8BB:CCFF:FE00:200, Serial2/0

OI  33:0:3::3/128 [110/74]

     via FE80::A8BB:CCFF:FE00:200, Serial2/0

OI  34::/64 [110/138]

     via FE80::A8BB:CCFF:FE00:200, Serial2/0

OI  44:0:1::4/128 [110/138]

     via FE80::A8BB:CCFF:FE00:200, Serial2/0

OI  44:0:2::4/128 [110/138]

     via FE80::A8BB:CCFF:FE00:200, Serial2/0

OI  44:0:3::4/128 [110/138]

     via FE80::A8BB:CCFF:FE00:200, Serial2/0

O   100::/16 [254/20]

     via Null0, directly connected

C   100::/64 [0/0]

     via Loopback100, directly connected

L   100::1/128 [0/0]

     via Loopback100, receive

C   100:0:1::/64 [0/0]

     via Loopback101, directly connected

L   100:0:1::1/128 [0/0]

     via Loopback101, receive

C   100:0:2::/64 [0/0]

     via Loopback102, directly connected

L   100:0:2::1/128 [0/0]

     via Loopback102, receive

C   100:0:3::/64 [0/0]

     via Loopback103, directly connected

L   100:0:3::1/128 [0/0]

     via Loopback103, receive

L   FF00::/8 [0/0]

     via Null0, receive

(When summarization is configured on a router; same router immediately created a routing point to Null 0 for loop prevention.)

R2#show ipv6 route

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

IPv6 Routing Table - default - 23 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

O   11:0:1::1/128 [110/64]

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

O   11:0:2::1/128 [110/64]

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

O   11:0:3::1/128 [110/64]

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

O   12::/61 [110/128]

     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

O   33:0:1::3/128 [110/10]

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

O   33:0:2::3/128 [110/10]

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

O   33:0:3::3/128 [110/10]

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

OI  34::/64 [110/74]

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

OI  44:0:1::4/128 [110/74]

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

OI  44:0:2::4/128 [110/74]

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

OI  44:0:3::4/128 [110/74]

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

OE2 100::/16 [110/20]

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

L   FF00::/8 [0/0]

     via Null0, receive

 (Summarized routes are received from external route.) 

LAB10: OSPF – 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: IPv6 OSPF Authentication:

Task 1: Configure IPv6 OSPF Authentication

• Enter the interface where authentication is required and select the encryption mode:

R1:

interface s2/0

ipv6 ospf authentication ipsec spi 256 md5 0123456789ABCDEF0123456789ABCDEF

exit

• Enable IPv6 OSPF authentication on both the neighbors:

R2:

interface s2/0

ipv6 ospf authentication ipsec spi 256 md5 0123456789ABCDEF0123456789ABCDEF

exit

Task 2:  Verification:

• Verification of authentication by following command:

R1#show run

! (To display the contents of the currently running configuration file or the configuration the show running-config command in privileged EXEC mode.)

 interface Serial2/0

 ipv6 address 12::/64 eui-64

 ipv6 ospf authentication ipsec spi 256 md5 0123456789ABCDEF0123456789ABCDEF

 ipv6 ospf 1 area 1

R2#show run

 interface Serial2/0

 ipv6 address 12::/64 eui-64

 ipv6 ospf authentication ipsec spi 256 md5 0123456789ABCDEF0123456789ABCDEF

 ipv6 ospf 1 area 1

 

• Verify OSPF neighborship by following command:

 

R1#clear ipv6 ospf process

R2#clear ipv6 ospf process

! (Will flush current IPv6 OSPF process and initiate fresh OSPF process.)

 

 

R1#show ipv6 ospf neighbors

! (Gives list of OSPF neighbors)

 

OSPFv3 Router with ID (11.0.3.1) (Process ID 1)

 

Neighbor ID     Pri        State         Dead Time      Interface ID      Interface

22.0.3.2          0             FULL/ -      00:00:32                11                Serial2/0

 

R2#show ipv6 ospf neighbors

! (Gives list of OSPF neighbors)

 

OSPFv3 Router with ID (22.0.3.2) (Process ID 2)

 

Neighbor ID     Pri       State          Dead Time       Interface ID         Interface

33.0.3.3             1      FULL/DR       00:00:39                 3                 Ethernet0/0

11.0.3.1             0      FULL/ -          00:00:39               11                 Serial2/0

 

(OSPF neighbors will authenticate the key and if key matches, OSPF neighborship will be formed. Fresh IPv6 OSPF neighborship can be verified in IPv6 OSPF neighbor table.)

 

 

 

 

 

 

 

 

 

 

 

LAB2: OSPF – IPv4

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 2: Diagram

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

LAB 2: OSPF Authentication

Task 1: Configure IPv4 OSPF Authentication

• Enter the interface where authentication is required and select the encryption mode

R1:

interface s2/0

ip ospf authentication message-digest

ip ospf message-digest-key 1 md5 cisco

exit

• Enable OSPF authentication on both the neighbors

 

R2:

interface serial 2/0

ip ospf authentication message-digest

ip ospf message-digest-key 1 md5 cisco

exit

 

Task 2:  Verification: 

• Verification of authentication by following command:

 

R1#show run

! (To display the contents of the currently running configuration file)

 

interface Serial 2/0

 ip address 12.0.0.1 255.255.255.0

 ip ospf authentication message-digest

 ip ospf message-digest-key 1 md5 cisco

 serial restart-delay 0

 

 

R2#show run

! (To display the contents of the currently running configuration file)

 

interface Serial 2/0

ip address 12.0.0.2 255.255.255.0

ip ospf authentication message-digest

ip ospf message-digest-key 1 md5 cisco 

serial restart-delay 0

 

 

• Verify OSPF neighborship by following command:

 

R1#clear ip ospf process

R2#clear ip ospf process

! (Will flush current OSPF process and initiate fresh OSPF process.)

 

R1#show ip ospf neighbors

! (Gives details and list of EIGRP neighbors)

 

Neighbor ID     Pri   State           Dead Time   Address         Interface

22.0.3.2          0   FULL/  -        00:00:31    12.0.0.2        Serial2/0

 

R2#show ip ospf neighbors

! (Gives details and list of EIGRP neighbors)

 

 Neighbor ID     Pri   State           Dead Time   Address         Interface

33.0.3.3          1   FULL/DR         00:00:33    23.0.0.3        Ethernet0/0

11.0.3.1          0   FULL/  -           00:00:31    12.0.0.1        Serial2/0

  

(OSPF neighbors will authenticate the key and if key matches, OSPF neighborship will be formed. Fresh OSPF neighborship can be verified in OSPF neighbor table.)

 

 

 

 

 

 

 

 

 

 

 

LAB1: OSPF – IPv4

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 1: Diagram

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

LAB 1: Configure OSPF FOR IPv4:

Task 1: Configure IPv4 OSPF process for Autonomous

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

R1:

router ospf 1    ! (Initiate OSPF process for Process ID 1)

network 11.0.1.1 255.255.255.0 area 1! (Send updates on int. where these N/W 

network 11.0.2.1 255.255.255.0 area 1 are configured in given area)

network 11.0.3.1 255.255.255.0 area 1

network 12.0.0.1 255.255.255.0 area 1

exit

R2:

router ospf 1

network 22.0.1.2 255.255.255.0 area 0

network 22.0.2.2 255.255.255.0 area 0

network 22.0.3.2 255.255.255.0 area 0

network 12.0.0.2 255.255.255.0 area 1

network 23.0.0.2 255.255.255.0 area 0

exit

R3:

router ospf 1

network 33.0.1.3 255.255.255.0 area 0

network 33.0.2.3 255.255.255.0 area 0

network 33.0.3.3 255.255.255.0 area 0

network 23.0.0.3 255.255.255.0 area 0

network 34.0.0.3 255.255.255.0 area 2

exit

R4:

router ospf 1

network 44.0.1.4 255.255.255.0 area 2

network 44.0.2.4 255.255.255.0 area 2

network 44.0.3.4 255.255.255.0 area 2

network 34.0.0.4 255.255.255.0 area 2

exit

Task 2:  Verification

• Verify IP protocols and its details by following command:

R2#show ip protocols

! (Gives details of protocols running on router)

 

 *** IP Routing is NSF aware ***

 

Routing Protocol is "ospf 1"

  Outgoing update filter list for all interfaces is not set

  Incoming update filter list for all interfaces is not set

  Router ID 22.0.3.2

  It is an area border router

  Number of areas in this router is 2. 2 normal 0 stub 0 nssa

  Maximum path: 4

  Routing for Networks:

    12.0.0.2 0.0.0.0 area 1

    22.0.1.2 0.0.0.0 area 0

    22.0.2.2 0.0.0.0 area 0

    22.0.3.2 0.0.0.0 area 0

    23.0.0.2 0.0.0.0 area 0

  Routing on Interfaces Configured Explicitly (Area 0):

    Loopback1

    Loopback2

    Loopback3

    Ethernet0/0

  Routing on Interfaces Configured Explicitly (Area 1):

    Serial2/0

  Routing Information Sources:

    Gateway         Distance      Last Update

    11.0.3.1             110      00:25:10

    33.0.3.3             110      00:24:35

  Distance: (default is 110)

 

 

• Verify OSPF updates are sent on relevant interfaces by following command:

 

R2#show ip ospf interfaces

! (Gives detailed list of interfaces on which OSPF is sending updates)

 

Loopback1 is up, line protocol is up

  Internet Address 22.0.1.2/24, Area 0, Attached via Interface Enable

  Process ID 1, Router ID 22.0.3.2, Network Type LOOPBACK, Cost: 1

  Topology-MTID    Cost    Disabled    Shutdown      Topology Name

        0           1         no          no            Base

  Enabled by interface config, including secondary ip addresses

  Loopback interface is treated as a stub Host

 

Loopback2 is up, line protocol is up

  Internet Address 22.0.2.2/24, Area 0, Attached via Interface Enable

  Process ID 1, Router ID 22.0.3.2, Network Type LOOPBACK, Cost: 1

  Topology-MTID    Cost    Disabled    Shutdown      Topology Name

        0           1         no          no            Base

  Enabled by interface config, including secondary ip addresses

  Loopback interface is treated as a stub Host

Loopback3 is up, line protocol is up

  Internet Address 22.0.3.2/24, Area 0, Attached via Interface Enable

  Process ID 1, Router ID 22.0.3.2, Network Type LOOPBACK, Cost: 1

  Topology-MTID    Cost    Disabled    Shutdown      Topology Name

        0           1         no          no            Base

  Enabled by interface config, including secondary ip addresses

  Loopback interface is treated as a stub Host

Ethernet0/0 is up, line protocol is up

  Internet Address 23.0.0.2/24, Area 0, Attached via Interface Enable

  Process ID 1, Router ID 22.0.3.2, Network Type BROADCAST, Cost: 10

  Topology-MTID    Cost    Disabled    Shutdown      Topology Name

        0           10        no          no            Base

  Enabled by interface config, including secondary ip addresses

  Transmit Delay is 1 sec, State BDR, Priority 1

  Designated Router (ID) 33.0.3.3, Interface address 23.0.0.3

  Backup Designated router (ID) 22.0.3.2, Interface address 23.0.0.2

  Timer intervals configured, Hello 10, Dead 40, Wait 40, Retransmit 5

    oob-resync timeout 40

    Hello due in 00:00:02

  Supports Link-local Signaling (LLS)

  Cisco NSF helper support enabled

  IETF NSF helper support enabled

  Index 4/4, flood queue length 0

  Next 0x0(0)/0x0(0)

  Last flood scan length is 1, maximum is 1

  Last flood scan time is 0 msec, maximum is 0 msec

  Neighbor Count is 1, Adjacent neighbor count is 1

    Adjacent with neighbor 33.0.3.3  (Designated Router)

  Suppress hello for 0 neighbor(s)

Serial2/0 is up, line protocol is up

  Internet Address 12.0.0.2/24, Area 1, Attached via Interface Enable

  Process ID 1, Router ID 22.0.3.2, Network Type POINT_TO_POINT, Cost: 64

  Topology-MTID    Cost    Disabled    Shutdown      Topology Name

        0           64        no          no            Base

  Enabled by interface config, including secondary ip addresses

  Transmit Delay is 1 sec, State POINT_TO_POINT

  Timer intervals configured, Hello 10, Dead 40, Wait 40, Retransmit 5

    oob-resync timeout 40

    Hello due in 00:00:01

  Supports Link-local Signaling (LLS)

  Cisco NSF helper support enabled

  IETF NSF helper support enabled

 

 Index 1/5, flood queue length 0

  Next 0x0(0)/0x0(0)

  Last flood scan length is 6, maximum is 6

  Last flood scan time is 0 msec, maximum is 1 msec

  Neighbor Count is 1, Adjacent neighbor count is 1

    Adjacent with neighbor 11.0.3.1

  Suppress hello for 0 neighbor(s) 

• Verify OSPF neighborship by following command:

 

R2#show ip ospf neighbors

! (Gives list of OSPF neighbors)

 

Neighbor ID     Pri   State           Dead Time   Address         Interface

33.0.3.3          1   FULL/DR         00:00:34    23.0.0.3        Ethernet0/0

11.0.3.1          0   FULL/  -          00:00:33    12.0.0.1        Serial2/0

 

 

• Verify OSPF database by following command:

 

R2#show ip ospf Database

! (Shows details of OSPF database based on Area Perspective and LSA Perspective) 

 

            OSPF Router with ID (22.0.3.2) (Process ID 1)

 

                Router Link States (Area 0)

 

Link ID         ADV Router      Age         Seq#       Checksum Link count

22.0.3.2        22.0.3.2        391         0x80000004 0x00BC7E 4

33.0.3.3        33.0.3.3        386         0x80000004 0x00A35A 4

 

                Net Link States (Area 0)

 

Link ID         ADV Router      Age         Seq#       Checksum

23.0.0.3        33.0.3.3        386         0x80000002 0x00595C

 

                Summary Net Link States (Area 0)

 

Link ID         ADV Router      Age         Seq#       Checksum

11.0.1.1        22.0.3.2        391         0x80000002 0x00874B

11.0.2.1        22.0.3.2        391         0x80000002 0x007C55

11.0.3.1        22.0.3.2        391         0x80000002 0x00715F

12.0.0.0        22.0.3.2        391         0x80000002 0x00854F

34.0.0.0        33.0.3.3        386         0x80000002 0x00FCB5

44.0.1.4        33.0.3.3        386         0x80000002 0x005151

44.0.2.4        33.0.3.3        386         0x80000002 0x00465B

44.0.3.4        33.0.3.3        386         0x80000002 0x003B65

 

 

                Router Link States (Area 1)

 

Link ID         ADV Router      Age         Seq#       Checksum Link count

11.0.3.1        11.0.3.1        405         0x80000003 0x003BB7 5

22.0.3.2        22.0.3.2        391         0x80000002 0x000340 2

 

                Summary Net Link States (Area 1)

 

Link ID         ADV Router      Age         Seq#       Checksum

22.0.1.2        22.0.3.2        391         0x80000002 0x006B9B

22.0.2.2        22.0.3.2        391         0x80000002 0x0060A5

22.0.3.2        22.0.3.2        391         0x80000002 0x0055AF

23.0.0.0        22.0.3.2        391         0x80000002 0x00D728

33.0.1.3        22.0.3.2        391         0x80000002 0x0036BA

33.0.2.3        22.0.3.2        391         0x80000002 0x002BC4

33.0.3.3        22.0.3.2        391         0x80000002 0x0020CE

34.0.0.0        22.0.3.2        391         0x80000002 0x00CAE9

44.0.1.4        22.0.3.2        391         0x80000002 0x001F85

44.0.2.4        22.0.3.2        391         0x80000002 0x00148F

44.0.3.4        22.0.3.2        391         0x80000002 0x000999

 

 

• Verify routing table and OSPF route entries by following command:

R2#show ip route

! (Shows router’s routing table and IPv4 routes entries)

 

Codes: L - local, C - connected, S - static, R - RIP, M - mobile, B - BGP

       D - EIGRP, EX - EIGRP external, O - OSPF, IA - OSPF inter area

       N1 - OSPF NSSA external type 1, N2 - OSPF NSSA external type 2

       E1 - OSPF external type 1, E2 - OSPF external type 2

       i - IS-IS, su - IS-IS summary, L1 - IS-IS level-1, L2 - IS-IS level-2

       ia - IS-IS inter area, * - candidate default, U - per-user static route

       o - ODR, P - periodic downloaded static route, H - NHRP, l - LISP

       + - replicated route, % - next hop override

 

Gateway of last resort is not set

 

      11.0.0.0/32 is subnetted, 3 subnets

O        11.0.1.1 [110/65] via 12.0.0.1, 00:45:16, Serial2/0

O        11.0.2.1 [110/65] via 12.0.0.1, 00:45:16, Serial2/0

O        11.0.3.1 [110/65] via 12.0.0.1, 00:45:16, Serial2/0

      12.0.0.0/8 is variably subnetted, 2 subnets, 2 masks

C        12.0.0.0/24 is directly connected, Serial2/0

L        12.0.0.2/32 is directly connected, Serial2/0

      22.0.0.0/8 is variably subnetted, 6 subnets, 2 masks

C        22.0.1.0/24 is directly connected, Loopback1

L        22.0.1.2/32 is directly connected, Loopback1

C        22.0.2.0/24 is directly connected, Loopback2

L        22.0.2.2/32 is directly connected, Loopback2

C        22.0.3.0/24 is directly connected, Loopback3

L        22.0.3.2/32 is directly connected, Loopback3

      23.0.0.0/8 is variably subnetted, 2 subnets, 2 masks

C        23.0.0.0/24 is directly connected, Ethernet0/0

L        23.0.0.2/32 is directly connected, Ethernet0/0

      33.0.0.0/32 is subnetted, 3 subnets

O        33.0.1.3 [110/11] via 23.0.0.3, 00:44:40, Ethernet0/0

O        33.0.2.3 [110/11] via 23.0.0.3, 00:44:40, Ethernet0/0

O        33.0.3.3 [110/11] via 23.0.0.3, 00:44:40, Ethernet0/0

      34.0.0.0/24 is subnetted, 1 subnets

O IA     34.0.0.0 [110/74] via 23.0.0.3, 00:44:40, Ethernet0/0

      44.0.0.0/32 is subnetted, 3 subnets

O IA     44.0.1.4 [110/75] via 23.0.0.3, 00:44:40, Ethernet0/0

O IA     44.0.2.4 [110/75] via 23.0.0.3, 00:44:40, Ethernet0/0

O IA     44.0.3.4 [110/75] via 23.0.0.3, 00:44:40, Ethernet0/0

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

LAB4: OSPF – IPv4

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 4: Diagram

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

LAB 4: OSPF Redistribution

Task 1: Configure IPv4 OSPF Redistribution 

• In the configuration mode of router configure 4 loopbacks with network address in sequence:

R1:

interface loopback 100

ip address 100.0.0.2 255.255.255.0

interface loopback 101

ip address 100.0.1.2 255.255.255.0

interface loopback 102

ip address 100.0.2.2 255.255.255.0

interface loopback 103

ip address 100.0.3.2 255.255.255.0

exit

 

 

• Redistribute these connected network in OSPF process (External Type 2)

 

R1:

router ospf 1

redistribute connected subnet

exit

 

(Redistributed connected will redistribute its connected network. Subnet will allow classless routes in OSPF process.)

 

R2#show ip route

! (Show router’s routing table and IPv4 entries)

 

Codes: L - local, C - connected, S - static, R - RIP, M - mobile, B - BGP

       D - EIGRP, EX - EIGRP external, O - OSPF, IA - OSPF inter area

       N1 - OSPF NSSA external type 1, N2 - OSPF NSSA external type 2

       E1 - OSPF external type 1, E2 - OSPF external type 2

       i - IS-IS, su - IS-IS summary, L1 - IS-IS level-1, L2 - IS-IS level-2

       ia - IS-IS inter area, * - candidate default, U - per-user static route

       o - ODR, P - periodic downloaded static route, H - NHRP, l - LISP

       + - replicated route, % - next hop override

 

Gateway of last resort is not set

      11.0.0.0/32 is subnetted, 3 subnets

O        11.0.1.1 [110/65] via 12.0.0.1, 00:04:06, Serial2/0

O        11.0.2.1 [110/65] via 12.0.0.1, 00:04:06, Serial2/0

O        11.0.3.1 [110/65] via 12.0.0.1, 00:04:06, Serial2/0

      

 

12.0.0.0/8 is variably subnetted, 2 subnets, 2 masks

C        12.0.0.0/24 is directly connected, Serial2/0

L        12.0.0.2/32 is directly connected, Serial2/0

      22.0.0.0/8 is variably subnetted, 6 subnets, 2 masks

C        22.0.1.0/24 is directly connected, Loopback1

L        22.0.1.2/32 is directly connected, Loopback1

C        22.0.2.0/24 is directly connected, Loopback2

L        22.0.2.2/32 is directly connected, Loopback2

C        22.0.3.0/24 is directly connected, Loopback3

L        22.0.3.2/32 is directly connected, Loopback3

      23.0.0.0/8 is variably subnetted, 2 subnets, 2 masks

C        23.0.0.0/24 is directly connected, Ethernet0/0

L        23.0.0.2/32 is directly connected, Ethernet0/0

      33.0.0.0/32 is subnetted, 3 subnets

O        33.0.1.3 [110/11] via 23.0.0.3, 00:03:22, Ethernet0/0

O        33.0.2.3 [110/11] via 23.0.0.3, 00:03:22, Ethernet0/0

O        33.0.3.3 [110/11] via 23.0.0.3, 00:03:22, Ethernet0/0

      34.0.0.0/24 is subnetted, 1 subnets

O IA     34.0.0.0 [110/74] via 23.0.0.3, 00:03:22, Ethernet0/0

      44.0.0.0/32 is subnetted, 3 subnets

O IA     44.0.1.4 [110/75] via 23.0.0.3, 00:02:44, Ethernet0/0

O IA     44.0.2.4 [110/75] via 23.0.0.3, 00:02:44, Ethernet0/0

O IA     44.0.3.4 [110/75] via 23.0.0.3, 00:02:44, Ethernet0/0

      100.0.0.0/24 is subnetted, 4 subnets

O E2     100.0.0.0 [110/20] via 12.0.0.1, 00:00:14, Serial2/0

O E2     100.0.1.0 [110/20] via 12.0.0.1, 00:00:14, Serial2/0

O E2     100.0.2.0 [110/20] via 12.0.0.1, 00:00:14, Serial2/0

O E2     100.0.3.0 [110/20] via 12.0.0.1, 00:00:14, Serial2/0

 

(E2 means External route type 2, in which will not change cost after every hop throughout the OSPF.)

 

• Redistribute these connected network in OSPF process (External Type 1)

 

R1:

router ospf 1

redistribute connected subnet metric-type 1

exit

 

(Redistributed connected will redistribute its connected network. 

Subnet will allow classless routes in OSPF process

Metric type 1 means will redistribute in the form of E1, in which will change cost after every hop.)

 

R2#show ip route

! (Show router’s routing table and IPv4 entries)

 

Codes: L - local, C - connected, S - static, R - RIP, M - mobile, B - BGP

       D - EIGRP, EX - EIGRP external, O - OSPF, IA - OSPF inter area

       N1 - OSPF NSSA external type 1, N2 - OSPF NSSA external type 2

       E1 - OSPF external type 1, E2 - OSPF external type 2

       i - IS-IS, su - IS-IS summary, L1 - IS-IS level-1, L2 - IS-IS level-2

       ia - IS-IS inter area, * - candidate default, U - per-user static route

       o - ODR, P - periodic downloaded static route, H - NHRP, l - LISP

       + - replicated route, % - next hop override

 

Gateway of last resort is not set

 

      11.0.0.0/32 is subnetted, 3 subnets

O        11.0.1.1 [110/65] via 12.0.0.1, 00:06:51, Serial2/0

O        11.0.2.1 [110/65] via 12.0.0.1, 00:06:51, Serial2/0

O        11.0.3.1 [110/65] via 12.0.0.1, 00:06:51, Serial2/0

      12.0.0.0/8 is variably subnetted, 2 subnets, 2 masks

C        12.0.0.0/24 is directly connected, Serial2/0

L        12.0.0.2/32 is directly connected, Serial2/0

      22.0.0.0/8 is variably subnetted, 6 subnets, 2 masks

C        22.0.1.0/24 is directly connected, Loopback1

L        22.0.1.2/32 is directly connected, Loopback1

C        22.0.2.0/24 is directly connected, Loopback2

L        22.0.2.2/32 is directly connected, Loopback2

C        22.0.3.0/24 is directly connected, Loopback3

L        22.0.3.2/32 is directly connected, Loopback3

      23.0.0.0/8 is variably subnetted, 2 subnets, 2 masks

C        23.0.0.0/24 is directly connected, Ethernet0/0

L        23.0.0.2/32 is directly connected, Ethernet0/0

      33.0.0.0/32 is subnetted, 3 subnets

O        33.0.1.3 [110/11] via 23.0.0.3, 00:06:07, Ethernet0/0

O        33.0.2.3 [110/11] via 23.0.0.3, 00:06:07, Ethernet0/0

O        33.0.3.3 [110/11] via 23.0.0.3, 00:06:07, Ethernet0/0

      34.0.0.0/24 is subnetted, 1 subnets

O IA     34.0.0.0 [110/74] via 23.0.0.3, 00:06:07, Ethernet0/0

      44.0.0.0/32 is subnetted, 3 subnets

O IA     44.0.1.4 [110/75] via 23.0.0.3, 00:05:29, Ethernet0/0

O IA     44.0.2.4 [110/75] via 23.0.0.3, 00:05:29, Ethernet0/0

O IA     44.0.3.4 [110/75] via 23.0.0.3, 00:05:29, Ethernet0/0

      100.0.0.0/24 is subnetted, 4 subnets

O E1     100.0.0.0 [110/84] via 12.0.0.1, 00:00:11, Serial2/0

O E1     100.0.1.0 [110/84] via 12.0.0.1, 00:00:11, Serial2/0

O E1     100.0.2.0 [110/84] via 12.0.0.1, 00:00:11, Serial2/0

O E1     100.0.3.0 [110/84] via 12.0.0.1, 00:00:11, Serial2/0

(E1 means External route type 1, in which will change cost after every hop throughout the OSPF.)

Task 2:  Verification

• Analyze network type as E1 or E2 and its cost of redistribution route in neighbor router

 

External Type 2:

 

R2#show ip route

 

O E2     100.0.0.0 [110/20] via 12.0.0.1, 00:00:14, Serial2/0

O E2     100.0.1.0 [110/20] via 12.0.0.1, 00:00:14, Serial2/0

O E2     100.0.2.0 [110/20] via 12.0.0.1, 00:00:14, Serial2/0

O E2     100.0.3.0 [110/20] via 12.0.0.1, 00:00:14, Serial2/0

 

(R2 router receives redistributed 100 network with metric (cost) 20 and R3 router receives redistributed 100 network with metric (cost) 20. Hence External type 2 (E2) cost remains constant after every hop.)

 

 

• Analyze network type as E1 or E2 and its cost of redistribution route in neighbor router

 

External Type 1:

 

R2#show ip route

 

O E1     100.0.0.0 [110/84] via 12.0.0.1, 00:00:18, Serial2/0

O E1     100.0.1.0 [110/84] via 12.0.0.1, 00:00:18, Serial2/0

O E1     100.0.2.0 [110/84] via 12.0.0.1, 00:00:18, Serial2/0

O E1     100.0.3.0 [110/84] via 12.0.0.1, 00:00:18, Serial2/0

 

R3#show ip route

 

O E1     100.0.0.0 [110/94] via 23.0.0.3, 00:03:10, Ethernet0/0

O E1     100.0.1.0 [110/94] via 23.0.0.3, 00:03:10, Ethernet0/0

O E1     100.0.2.0 [110/94] via 23.0.0.3, 00:03:10, Ethernet0/0

O E1     100.0.3.0 [110/94] via 23.0.0.3, 00:03:10, Ethernet0/0

 

(R1 router receives redistributed 100 network with metric (cost) 84 and R3 router receives redistributed 100 network with metric (cost) 94.Hence External type 1 (E1) allows to change cost after every hop.)