OSPF IPv6 - Initial Configuration
Initial Configuration
The initial configuration of OSPF (Open Shortest Path First) for IPv6 involves setting up fundamental parameters to establish OSPF routing within an IPv6 network. Key aspects of the initial configuration include assigning OSPF router IDs, specifying OSPF areas, configuring interfaces, and establishing OSPF neighbor relationships. The router ID serves as a unique identifier for each OSPF router within the Autonomous System (AS), and it can be manually assigned or automatically determined based on factors such as the highest IPv6 address on an active interface. OSPF areas partition the network into logical segments, contributing to efficient routing and network scalability. Interface configuration entails enabling OSPF on interfaces and specifying the area to which they belong. OSPF routers discover neighbors through the exchange of Hello packets, and administrators must configure routers to recognize and form adjacencies with neighboring routers. Proper initial configuration is crucial for building a stable and functional OSPF network, ensuring routers effectively exchange routing information and compute optimal paths throughout the OSPF domain.
Lab:
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 Dzas isdz 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
Task 1: Configure IPv6 OSPF process for Autonomous
Step 1: In the configuration mode of router configure IPv6 OSPF Process by following command:
R1:
ipv6 router ospf 1 ! (Start IPv6 OSPF with Process ID 1)
interface s2/0 ! (Send updates on interface in given area)
ipv6 ospf 1 area 1
interface loopback 1
ipv6 ospf 1 area 1
interface loopback 2
ipv6 ospf 1 area 1
interface loopback 3
ipv6 ospf 1 area 1
exit
R2:
ipv6 router ospf 1
interface s2/0
ipv6 ospf 1 area 1
interface e0/0
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 e0/0
ipv6 ospf 1 area 0
interface s2/0
ipv6 ospf 1 area 2
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 s2/0
ipv6 ospf 1 area 2
interface loopback 1
ipv6 ospf 1 area 2
interface loopback 2
ipv6 ospf 1 area 2
interface loopback 3
ipv6 ospf 1 area 2
exit
Task 2: Verification:
Step 1: Verify IPv6 protocols and its details by following command:
R2#show ipv6 protocols
! (Gives details of protocols running on router)
IPv6 Routing Protocol is "connected"
IPv6 Routing Protocol is "ND"
IPv6 Routing Protocol is "ospf 1"
Router ID 22.0.3.2
Area border router
Number of areas: 2 normal, 0 stub, 0 nssa
Interfaces (Area 0):
Loopback1
Loopback2
Loopback3
Ethernet0/0
Interfaces (Area 1):
Serial2/0
Redistribution:
None
Step 2: Verify OSPF updates are sent on relevant interfaces by following command:
! (Gives detailed list of interfaces on which IPv6 OSPF is sending updates)
Loopback1 is up, line protocol is up
Link Local Address FE80::A8BB:CCFF:FE00:200, Interface ID 18
Area 0, Process ID 2, Instance ID 0, Router ID 22.0.3.2
Network Type LOOPBACK, Cost: 1
Loopback interface is treated as a stub Host
Loopback2 is up, line protocol is up
Link Local Address FE80::A8BB:CCFF:FE00:200, Interface ID 19
Area 0, Process ID 2, Instance ID 0, Router ID 22.0.3.2
Network Type LOOPBACK, Cost: 1
Loopback interface is treated as a stub Host
Loopback3 is up, line protocol is up
Link Local Address FE80::A8BB:CCFF:FE00:200, Interface ID 20
Area 0, Process ID 2, Instance ID 0, Router ID 22.0.3.2
Network Type LOOPBACK, Cost: 1
Loopback interface is treated as a stub Host
Ethernet0/0 is up, line protocol is up
Link Local Address FE80::A8BB:CCFF:FE00:200, Interface ID 3
Area 0, Process ID 2, Instance ID 0, Router ID 22.0.3.2
Network Type BROADCAST, Cost: 10
Transmit Delay is 1 sec, State BDR, Priority 1
Designated Router (ID) 33.0.3.3, local address FE80::A8BB:CCFF:FE00:300
Backup Designated router (ID) 22.0.3.2, local address
FE80::A8BB:CCFF:FE00:200
Timer intervals configured, Hello 10, Dead 40, Wait 40, Retransmit 5
Hello due in 00:00:02
Graceful restart helper support enabled
Index 1/1/2, flood queue length 0
Next 0x0(0)/0x0(0)/0x0(0)
Last flood scan length is 2, maximum is 2
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
Link Local Address FE80::A8BB:CCFF:FE00:200, Interface ID 11
Area 1, Process ID 2, Instance ID 0, Router ID 22.0.3.2
Network Type POINT_TO_POINT, Cost: 64
Transmit Delay is 1 sec, State POINT_TO_POINT
Timer intervals configured, Hello 10, Dead 40, Wait 40, Retransmit 5
Hello due in 00:00:01
Graceful restart helper support enabled
Index 1/1/1, flood queue length 0
Next 0x0(0)/0x0(0)/0x0(0)
Last flood scan length is 7, maximum is 7
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)
(In IPv6, Router ID is in form of IPv4)
Step 3: Verify OSPF neighborship by following command:
R2#show ipv6 ospf neighbors
! (Gives list of IPv6 OSPF neighbors)
OSPFv3 Router with ID (22.0.3.2) (Process ID 1)
Neighbor ID Pri State Dead Time Interface ID Interface
33.0.3.3 1 FULL/DR 00:00:33 3 Ethernet0/0
11.0.3.1 0 FULL/ - 00:00:38 11 Serial2/0
Step 4: Verify IPv6 OSPF database by following command:
R2#show ipv6 ospf database
! (Shows details of IPv6 OSPF database based on Area Perspective and LSA
Perspective)
OSPFv3 Router with ID (22.0.3.2) (Process ID 1)
Router Link States (Area 0)
ADV Router Age Seq# Fragment ID Link count Bits
22.0.3.2 126 0x80000003 0 1 B
33.0.3.3 127 0x80000003 0 1 B
Net Link States (Area 0)
ADV Router Age Seq# Link ID Rtr count
33.0.3.3 127 0x80000001 3 2
Inter Area Prefix Link States (Area 0)
ADV Router Age Seq# Prefix
22.0.3.2 154 0x80000001 11:0:1::1/128
22.0.3.2 154 0x80000001 11:0:2::1/128
22.0.3.2 154 0x80000001 11:0:3::1/128
22.0.3.2 154 0x80000001 12::/61
22.0.3.2 154 0x80000001 12::/64
33.0.3.3 154 0x80000001 34::/64
33.0.3.3 154 0x80000001 44:0:1::4/128
33.0.3.3 154 0x80000001 44:0:2::4/128
33.0.3.3 154 0x80000001 44:0:3::4/128
Link (Type-8) Link States (Area 0)
ADV Router Age Seq# Link ID Interface
22.0.3.2 162 0x80000002 3 Et0/0
33.0.3.3 163 0x80000002 3 Et0/0
Intra Area Prefix Link States (Area 0)
ADV Router Age Seq# Link ID Ref-lstype Ref-LSID
22.0.3.2 126 0x80000003 0 0x2001 0
33.0.3.3 127 0x80000003 0 0x2001 0
33.0.3.3 127 0x80000001 3072 0x2002 3
Router Link States (Area 1)
ADV Router Age Seq# Fragment ID Link count Bits
11.0.3.1 162 0x80000002 0 1 None
22.0.3.2 163 0x80000001 0 1 B
Inter Area Prefix Link States (Area 1)
ADV Router Age Seq# Prefix
22.0.3.2 164 0x80000001 22:0:1::2/128
22.0.3.2 164 0x80000001 22:0:2::2/128
22.0.3.2 164 0x80000001 22:0:3::2/128
22.0.3.2 154 0x80000001 23::/64
22.0.3.2 122 0x80000001 33:0:1::3/128
22.0.3.2 122 0x80000001 33:0:2::3/128
22.0.3.2 122 0x80000001 33:0:3::3/128
22.0.3.2 122 0x80000001 44:0:3::4/128
22.0.3.2 122 0x80000001 44:0:2::4/128
22.0.3.2 122 0x80000001 44:0:1::4/128
22.0.3.2 122 0x80000001 34::/64
Link (Type-8) Link States (Area 1)
ADV Router Age Seq# Link ID Interface
11.0.3.1 160 0x80000002 11 Se2/0
22.0.3.2 159 0x80000002 11 Se2/0
Intra Area Prefix Link States (Area 1)
ADV Router Age Seq# Link ID Ref-lstype Ref-LSID
11.0.3.1 162 0x80000002 0 0x2001 0
22.0.3.2 159 0x80000001 0 0x2001 0
Step 5: Verify routing table and IPv6 OSPF route entries by following command:
R2#show ipv6 route
! (Shows router’s routing table and IPv6 routes entries)
IPv6 Routing Table - default - 22 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
L FF00::/8 [0/0]
via Null0, receive