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Dell SmartFabric OS10 User Guide Release 10.5.3

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Use case 2 - Route summarization at the ABR router

This use case describes route summarization at the ABR router using the area range configuration.

area-range-address-command-address-1

After configuring the area range command on Router R2 all the interarea routes are summarized.

In the previous configuration without an area range, interarea routes 2005:1:2:3::/64 and 2005:1:4:5::/64 are advertised from R2 to R3.

After configuring the area range command, only the summarized route (2005:1::/32) is advertised from R2 to R3.

The following depicts the no form of the not-advertise option:

area-range-command-address-2

Configuration on router R2

  • Without area range configuration:
    !
    router ospfv3 10
  • After configuring area range configuration
    !
    router ospfv3 10
    area 1.1.1.1 range 2005:1::/32
  • area range with not-advertise option
    OS10(config-router-ospfv3-10)# area 1.1.1.1 range 
    
    2005:1::/32 not-advertise
    !
    router ospfv3 10
    area 1.1.1.1 range 2005:1::/32 not-advertise
  • No form of not-advertise option
    OS10(config-router-ospfv3-10)# no area 1.1.1.1 
    range 2005:1::/32 not-advertise
    OS10(config-router-ospfv3-10)# show 
    configuration
    !
    router ospfv3 10
    area 1.1.1.1 range 2005:1::/32
    No form of "area <area-id> <prefix>
     not-advertise" is equivalent
     to "area <area-id> <prefix>"

RTM routes at router R2

  • OS10# show ipv6 route
    O 2005:1:2:3::/64 via
     fe80::4093:a4ff:fe1c:a91e
     ethernet1/1/4 110/5 00:00:09
    O 2005:1:4:5::/64 via 
    fe80::4093:a4ff:fe1c:a91e 
    ethernet1/1/4 110/5 00:00:091
  • OS10# show ipv6 route
    +O 2005:1::/32 Direct 
    null0 0/0 00:00:11
    O 2005:1:2:3::/64 via 
    fe80::4093:a4ff:fe1c:a91e 
    ethernet1/1/4 110/5 00:02:24
    O 2005:1:4:5::/64 via 
    fe80::4093:a4ff:fe1c:a91e 
    ethernet1/1/4 110/5 00:02:243
  • OS10# show ipv6 route
    O 2005:1:2:3::/64 via 
    fe80::4093:a4ff:fe1c:a91e 
    ethernet1/1/4 110/5 00:07:09
    O 2005:1:4:5::/64 via 
    fe80::4093:a4ff:fe1c:a91e 
    
    ethernet1/1/4 110/5 00:07:09
  • OS10# show ipv6 route
    +O 2005:1::/32 Direct null0 0/0 00:00:11
    O 2005:1:2:3::/64 via 
    fe80::4093:a4ff:fe1c:a91e 
    ethernet1/1/4 110/5 00:02:24
    O 2005:1:4:5::/64 via 
    fe80::4093:a4ff:fe1c:a91e 
    ethernet1/1/4 110/5 00:02:24

RTM routes at router R3

  • OS10# show ipv6 route
    O IA 2005:1:2:3::/64 via fe80::ec4e:92ff:fecb:a897 ethernet1/1/1 110/9 00:00:38
    O IA 2005:1:4:5::/64 via fe80::ec4e:92ff:fecb:a897 ethernet1/1/1 110/9 00:00:38/64 via fe80::ec4e:92ff:fecb:a897 ethernet1/1/1 110/20 00:00:03
  • OS10# show ipv6 route
    O IA 2005:1::/32 via fe80::ec4e:92ff:fecb:a897 ethernet1/1/1 110/9 00:00:33 via fe80::ec4e:92ff:fecb:a897 ethernet1/1/1 110/20 00:01:08
  • OS10# show ipv6 route
    O E2 2005:1::/32 via fe80::ec4e:92ff:fecb:a897 ethernet1/1/1 110/20 00:01:08
    OS10# show ipv6 ospf database
    Type-5 AS External Link States
    ADV Router       Age      Seq#                 Prefix         Tag
    -------------------------------------------------------------------
    6.32.136.106     373     0x80000001       2005:1::/32         300
  • OS10# show ipv6 route
    <No routes which fall under the range of area range <prefix> will be advertised to R3".ch fall under the range of summary <prefix> will be advertised to R2".

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