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Example for Configuring OSPFv3 Route Summarization on an ABR
Networking Requirements
Routes with the same IPv6 prefix can be summarized into one route. On a large-scale OSPFv3 network, route lookup may slow down because of the large size of the routing table. To reduce the routing table size and simplify management, configure route summarization. With route summarization, if a link connected to a device within an IPv6 address range that has been summarized alternates between Up and Down, the link status change is not advertised to the devices beyond the IPv6 address range. This prevents route flapping and improves network stability.
In Figure 6-13, all devices run OSPFv3. To reduce the routing table size, simplify route management, and improve network stability, it is required that the ABR be configured to summarize the routes with the same prefix (FC00:0:0::) into route FC00:0:0::/48 and advertise it only to area 0.
Configuration Roadmap
The configuration roadmap is as follows:
Assign an IP address to each interface to ensure that devices on the network can communicate with each other.
Configure basic OSPFv3 functions on all devices.
Configure OSPFv3 route summarization on the ABR.
Procedure
- Configure an IP address for each interface.
# Configure SwitchA. The configurations of SwitchB, SwitchC are similar to the configuration of SwitchA.
<HUAWEI> system-view [~HUAWEI] sysname SwitchA [*HUAWEI] commit [~SwitchA] interface 10ge 1/0/1 [~SwitchA-10GE1/0/1] undo portswitch [*SwitchA-10GE1/0/1] ipv6 enable [*SwitchA-10GE1/0/1] ipv6 address fc00:0:0:1002::1 64 [*SwitchA-10GE1/0/1] quit [*SwitchA] commit
# Configure the ABR.
<HUAWEI> system-view [~HUAWEI] sysname ABR [*HUAWEI] commit [~ABR] interface 10ge 1/0/1 [~ABR-10GE1/0/1] undo portswitch [*ABR-10GE1/0/1] ipv6 enable [*ABR-10GE1/0/1] ipv6 address fc00:0:0:1001::2 64 [*ABR-10GE1/0/1] quit [*ABR] interface 10ge 1/0/2 [*ABR-10GE1/0/2] undo portswitch [*ABR-10GE1/0/2] ipv6 enable [*ABR-10GE1/0/2] ipv6 address fc00:0:0:1002::2 64 [*ABR-10GE1/0/2] quit [*ABR] interface 10ge 1/0/3 [*ABR-10GE1/0/3] undo portswitch [*ABR-10GE1/0/3] ipv6 enable [*ABR-10GE1/0/3] ipv6 address fc00:0:0:1003::2 64 [*ABR-10GE1/0/3] quit [*ABR] commit
- Configure basic OSPFv3 functions.
# Configure SwitchA.
[~SwitchA] ospfv3 1 [*SwitchA-ospfv3-1] router-id 10.1.1.1 [*SwitchA-ospfv3-1] area 0.0.0.1 [*SwitchA-ospfv3-1-area-0.0.0.1] quit [*SwitchA-ospfv3-1] quit [*SwitchA] commit [~SwitchA] interface 10ge 1/0/1 [~SwitchA-10GE1/0/1] ospfv3 1 area 1 [*SwitchA-10GE1/0/1] quit [*SwitchA] commit
# Configure SwitchB.
[~SwitchB] ospfv3 1 [*SwitchB-ospfv3-1] router-id 10.2.2.2 [*SwitchB-ospfv3-1] area 0.0.0.0 [*SwitchB-ospfv3-1-area-0.0.0.0] quit [*SwitchB-ospfv3-1] quit [*SwitchB] commit [~SwitchB] interface 10ge 1/0/1 [~SwitchB-10GE1/0/1] ospfv3 1 area 0 [*SwitchB-10GE1/0/1] quit [*SwitchB] commit
# Configure SwitchC.
[~SwitchC] ospfv3 1 [*SwitchC-ospfv3-1] router-id 10.3.3.3 [*SwitchC-ospfv3-1] area 0.0.0.1 [*SwitchC-ospfv3-1-area-0.0.0.1] quit [*SwitchC-ospfv3-1] quit [*SwitchC] commit [~SwitchC] interface 10ge 1/0/1 [~SwitchC-10GE1/0/1] ospfv3 1 area 1 [*SwitchC-10GE1/0/1] quit [*SwitchC] commit
# Configure the ABR.
[~ABR] ospfv3 1 [*ABR-ospfv3-1] router-id 10.4.4.4 [*ABR-ospfv3-1] area 0.0.0.0 [*ABR-ospfv3-1-area-0.0.0.0] quit [*ABR-ospfv3-1] area 0.0.0.1 [*ABR-ospfv3-1-area-0.0.0.1] quit [*ABR-ospfv3-1] quit [*ABR] commit [~ABR] interface 10ge 1/0/1 [~ABR-10GE1/0/1] ospfv3 1 area 0 [*ABR-10GE1/0/1] quit [*ABR] interface 10ge 1/0/2 [*ABR-10GE1/0/2] ospfv3 1 area 1 [*ABR-10GE1/0/2] quit [*ABR] interface 10ge 1/0/3 [*ABR-10GE1/0/3] ospfv3 1 area 1 [*ABR-10GE1/0/3] quit [*ABR] commit
# Run the display ospfv3 peer command to check whether the ABR establishes an OSPFv3 neighbor relationship with SwitchA, SwitchB, and SwitchC. The following example uses the command output on the ABR:
[~ABR] display ospfv3 peer OSPFv3 Process (1) Total number of peer(s): 3 Peer(s) in full state: 3 OSPFv3 Area (0.0.0.0) Neighbor ID Pri State Dead Time Interface Instance ID 10.2.2.2 1 Full/Backup 00:00:39 10GE1/0/1 0 OSPFv3 Area (0.0.0.1) Neighbor ID Pri State Dead Time Interface Instance ID 10.1.1.1 1 Full/Backup 00:00:31 10GE1/0/2 0 10.3.3.3 1 Full/Backup 00:00:32 10GE1/0/3 0# Run the display ospfv3 lsdb command on the ABR to check the OSPFv3 LSDB information. The Inter-area-prefix LSA field in the LSDB of area 1 shows that no summarization is performed for the routes. Therefore, the routes advertised to area 0 are not summarized.
[~ABR] display ospfv3 lsdb OSPFv3 Router with ID (10.4.4.4) (Process 1) Link-LSA (Interface 10GE1/0/1) Link State ID Origin Router Age Seq# CkSum Prefix 0.0.0.54 10.2.2.2 190 0x80000001 0x7edd 1 0.0.11.187 10.4.4.4 1125 0x80000001 0xd1c8 1 Link-LSA (Interface 10GE1/0/2) Link State ID Origin Router Age Seq# CkSum Prefix 0.0.0.56 10.1.1.1 391 0x80000002 0x854f 1 0.0.11.226 10.4.4.4 938 0x80000002 0x56f3 1 Link-LSA (Interface 10GE1/0/3) Link State ID Origin Router Age Seq# CkSum Prefix 0.0.0.13 10.3.3.3 692 0x80000001 0xc969 1 0.0.11.189 10.4.4.4 885 0x80000002 0x2e65 1 Router-LSA (Area 0.0.0.0) Link State ID Origin Router Age Seq# CkSum Link 0.0.0.1 10.2.2.2 150 0x80000002 0x7782 1 0.0.0.1 10.4.4.4 149 0x80000005 0x2738 1 Network-LSA (Area 0.0.0.0) Link State ID Origin Router Age Seq# CkSum 0.0.11.187 10.4.4.4 149 0x80000002 0x38ec Inter-Area-Prefix-LSA (Area 0.0.0.0) Link State ID Origin Router Age Seq# CkSum 0.0.0.2 10.4.4.4 938 0x80000001 0xd0fd 0.0.0.3 10.4.4.4 885 0x80000001 0xd8f3 Intra-Area-Prefix-LSA (Area 0.0.0.0) Link State ID Origin Router Age Seq# CkSum Prefix Reference 0.0.0.1 10.4.4.4 149 0x80000002 0x635f 1 Network-LSA Router-LSA (Area 0.0.0.1) Link State ID Origin Router Age Seq# CkSum Link 0.0.0.1 10.1.1.1 391 0x80000002 0x696a 1 0.0.0.1 10.3.3.3 687 0x80000002 0x46d7 1 0.0.0.1 10.4.4.4 390 0x80000003 0x5602 2 Network-LSA (Area 0.0.0.1) Link State ID Origin Router Age Seq# CkSum 0.0.11.189 10.4.4.4 686 0x80000001 0x41df 0.0.11.226 10.4.4.4 401 0x80000001 0x976a Inter-Area-Prefix-LSA (Area 0.0.0.1) Link State ID Origin Router Age Seq# CkSum 0.0.0.1 10.4.4.4 950 0x80000001 0xc808 Intra-Area-Prefix-LSA (Area 0.0.0.1) Link State ID Origin Router Age Seq# CkSum Prefix Reference 0.0.0.1 10.4.4.4 697 0x80000001 0xad12 1 Network-LSA 0.0.0.2 10.4.4.4 401 0x80000001 0xfc9d 1 Network-LSA[~ABR] display ospfv3 lsdb inter-prefix OSPFv3 Router with ID (10.4.4.4) (Process 1) Inter-Area-Prefix-LSA (Area 0.0.0.0) LS Age: 1006 LS Type: Inter-Area-Prefix-LSA Link State ID: 0.0.0.2 Originating Router: 10.4.4.4 LS Seq Number: 0x80000001 Retransmit Count: 0 Checksum: 0xd0fd Length: 36 Metric: 1 Prefix: FC00:0:0:1002::/64 Prefix Options: 0 (-|-|-|-|-) LS Age: 953 LS Type: Inter-Area-Prefix-LSA Link State ID: 0.0.0.3 Originating Router: 10.4.4.4 LS Seq Number: 0x80000001 Retransmit Count: 0 Checksum: 0xd8f3 Length: 36 Metric: 1 Prefix: FC00:0:0:1003::/64 Prefix Options: 0 (-|-|-|-|-) Inter-Area-Prefix-LSA (Area 0.0.0.1) LS Age: 1007 LS Type: Inter-Area-Prefix-LSA Link State ID: 0.0.0.1 Originating Router: 10.4.4.4 LS Seq Number: 0x80000001 Retransmit Count: 0 Checksum: 0xc808 Length: 36 Metric: 1 Prefix: FC00:0:0:1001::/64 Prefix Options: 0 (-|-|-|-|-) - Configure the ABR to summarize the routes with the same prefix in area 1 into route FC00:0:0::/48.
[~ABR] ospfv3 1 [*ABR-ospfv3-1] area 0.0.0.1 [*ABR-ospfv3-1-area-0.0.0.1] abr-summary fc00:0:0:: 48 [*ABR-ospfv3-1-area-0.0.0.1] quit [*ABR-ospfv3-1] quit [*ABR] commit
- Verify the configuration.
Run the display ospfv3 lsdb command on the ABR to check the OSPFv3 LSDB information. The following command output shows that the routes with the same prefix in area 1 have been summarized into route FC00:0:0::/48 and that the summarized route is advertised to area 0.
[~ABR] display ospfv3 lsdb OSPFv3 Router with ID (10.4.4.4) (Process 1) Link-LSA (Interface 10GE1/0/1) Link State ID Origin Router Age Seq# CkSum Prefix 0.0.0.54 10.2.2.2 675 0x80000001 0x7edd 1 0.0.11.187 10.4.4.4 1610 0x80000001 0xd1c8 1 Link-LSA (Interface 10GE1/0/2) Link State ID Origin Router Age Seq# CkSum Prefix 0.0.0.56 10.1.1.1 876 0x80000002 0x854f 1 0.0.11.226 10.4.4.4 1423 0x80000002 0x56f3 1 Link-LSA (Interface 10GE1/0/3) Link State ID Origin Router Age Seq# CkSum Prefix 0.0.0.13 10.3.3.3 1177 0x80000001 0xc969 1 0.0.11.189 10.4.4.4 1370 0x80000002 0x2e65 1 Router-LSA (Area 0.0.0.0) Link State ID Origin Router Age Seq# CkSum Link 0.0.0.1 10.2.2.2 635 0x80000002 0x7782 1 0.0.0.1 10.4.4.4 634 0x80000005 0x2738 1 Network-LSA (Area 0.0.0.0) Link State ID Origin Router Age Seq# CkSum 0.0.11.187 10.4.4.4 634 0x80000002 0x38ec Inter-Area-Prefix-LSA (Area 0.0.0.0) Link State ID Origin Router Age Seq# CkSum 0.0.0.4 10.4.4.4 20 0x80000001 0x17d7 Intra-Area-Prefix-LSA (Area 0.0.0.0) Link State ID Origin Router Age Seq# CkSum Prefix Reference 0.0.0.1 10.4.4.4 634 0x80000002 0x635f 1 Network-LSA Router-LSA (Area 0.0.0.1) Link State ID Origin Router Age Seq# CkSum Link 0.0.0.1 10.1.1.1 876 0x80000002 0x696a 1 0.0.0.1 10.3.3.3 1172 0x80000002 0x46d7 1 0.0.0.1 10.4.4.4 875 0x80000003 0x5602 2 Network-LSA (Area 0.0.0.1) Link State ID Origin Router Age Seq# CkSum 0.0.11.189 10.4.4.4 1171 0x80000001 0x41df 0.0.11.226 10.4.4.4 875 0x80000001 0x976a Inter-Area-Prefix-LSA (Area 0.0.0.1) Link State ID Origin Router Age Seq# CkSum 0.0.0.1 10.4.4.4 1438 0x80000001 0xc808 Intra-Area-Prefix-LSA (Area 0.0.0.1) Link State ID Origin Router Age Seq# CkSum Prefix Reference 0.0.0.1 10.4.4.4 1185 0x80000001 0xad12 1 Network-LSA 0.0.0.2 10.4.4.4 889 0x80000001 0xfc9d 1 Network-LSA[~ABR] display ospfv3 lsdb inter-prefix OSPFv3 Router with ID (10.4.4.4) (Process 1) Inter-Area-Prefix-LSA (Area 0.0.0.0) LS Age: 76 LS Type: Inter-Area-Prefix-LSA Link State ID: 0.0.0.4 Originating Router: 10.4.4.4 LS Seq Number: 0x80000001 Retransmit Count: 0 Checksum: 0x17d7 Length: 36 Metric: 1 Prefix: FC00::/48 Prefix Options: 0 (-|-|-|-|-) Inter-Area-Prefix-LSA (Area 0.0.0.1) LS Age: 1480 LS Type: Inter-Area-Prefix-LSA Link State ID: 0.0.0.1 Originating Router: 10.4.4.4 LS Seq Number: 0x80000001 Retransmit Count: 0 Checksum: 0xc808 Length: 36 Metric: 1 Prefix: FC00:0:0:1001::/64 Prefix Options: 0 (-|-|-|-|-)# Run the display ospfv3 abr-summary-list command on the ABR to check information about the summarized route.
[~ABR] display ospfv3 abr-summary-list OSPFv3 Process (1) Area ID : 0.0.0.1 Prefix Prefix-Len Matched Status FC00:: 48 2 [Active] Advertised
Configuration Files
SwitchA configuration file
# sysname SwitchA # ospfv3 1 router-id 10.1.1.1 area 0.0.0.1 # interface 10GE 1/0/1 undo portswitch ipv6 enable ipv6 address FC00:0:0:1002::1/64 ospfv3 1 area 0.0.0.1 # returnSwitchB configuration file
# sysname SwitchB # ospfv3 1 router-id 10.2.2.2 area 0.0.0.0 # interface 10GE 1/0/1 undo portswitch ipv6 enable ipv6 address FC00:0:0:1001::1/64 ospfv3 1 area 0.0.0.0 # returnSwitchC configuration file
# sysname SwitchC # ospfv3 1 router-id 10.3.3.3 area 0.0.0.1 # interface 10GE 1/0/1 undo portswitch ipv6 enable ipv6 address FC00:0:0:1003::1/64 ospfv3 1 area 0.0.0.1 # returnABR configuration file
# sysname ABR # ospfv3 1 router-id 10.4.4.4 area 0.0.0.0 area 0.0.0.1 abr-summary FC00:: 48 # interface 10GE 1/0/1 undo portswitch ipv6 enable ipv6 address FC00:0:0:1001::2/64 ospfv3 1 area 0.0.0.0 # interface 10GE 1/0/2 undo portswitch ipv6 enable ipv6 address FC00:0:0:1002::2/64 ospfv3 1 area 0.0.0.1 # interface 10GE 1/0/3 undo portswitch ipv6 enable ipv6 address FC00:0:0:1003::2/64 ospfv3 1 area 0.0.0.1 # return