Dell SmartFabric OS10 User Guide Release 10.5.3

Use case 2 - Route summarization at the ABR router

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

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:

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".