Dell SmartFabric OS10 User Guide Release 10.5.3

Use case 1 - Route summarization at the ASBR router

This use case describes route summarization at the ASBR router using summary address configuration.

Before applying the summary-address command, individual routes (2005:1:2:3::/64 and 2005:1:4::/64) were advertised from Router R1 to R2.

After you apply route summarization, a single summarized route 2005:1::/32 is advertised to R2.

After you apply route summarization, summary route with special next hop NULL0 is installed in the RTM, Linux, and the NPU to block the summary route for the summary prefix.

Configuration on router R1

• Without summary address configuration:

  !
  router ospfv3 10
  redistribute static

• After configuring summary address configuration:

  !
  router ospfv3 10
  summary-address 2005:1::/32
  redistribute static

• Summary address with tag option:

  !
  router ospfv3 10
  summary-address 2005:1::/32 tag 300
  redistribute static

• Summary address with "not-advertise" option:

  !
  router ospfv3 10
  summary-address 2005:1::/32 not-advertise
  redistribute static

• No form of not-advertise option:

  OS10(config-router-ospfv3-10)# show configuration
  !
  router ospfv3 10
  summary-address 2005:1::/32 not-advertise
  redistribute static
  OS10(config-router-ospfv3-10)# no summary-address 2005:1::/32 not-advertise
  
  OS10(config-router-ospfv3-10)# show configuration
  !
  router ospfv3 10
  summary-address 2005:1::/32
  redistribute static
  
  No form of "summary address <prefix> not-advertise" is equivalent to "summary address <prefix>"

RTM routes at router R1

• OS10# show ipv6 route
  S 2005:1:2:3::/64 via 10::3 ethernet1/1/1 1/0 00:00:43
  S 2005:1:4:5::/64 via 10::3 ethernet1/1/1 1/0 00:00:21

• OS10# show ipv6 route
  +O 2005:1::/32 Direct null0 110/0 00:00:44
  S 2005:1:2:3::/64 via 10::3 ethernet1/1/1 1/0 00:04:24
  S 2005:1:4:5::/64 via 10::3 ethernet1/1/1 1/0 00:02:23

• OS10# show ipv6 route
  +O 2005:1::/32 Direct null0 110/0 00:00:44
  S 2005:1:2:3::/64 via 10::3 ethernet1/1/1 1/0 00:04:24
  S 2005:1:4:5::/64 via 10::3 ethernet1/1/1 1/0 00:02:23

• OS10# show ipv6 route
  S 2005:1:2:3::/64 via 10::3 ethernet1/1/1 1/0 00:06:43
  S 2005:1:4:5::/64 via 10::3 ethernet1/1/1 1/0 00:04:42

• OS10# show ipv6 route
  +O 2005:1::/32 Direct null0 110/0 00:00:44
  S 2005:1:2:3::/64 via 10::3 ethernet1/1/1 1/0 00:04:24
  S 2005:1:4:5::/64 via 10::3 ethernet1/1/1 1/0 00:02:23

RTM routes at router R2

• OS10# show ipv6 route
  O E2 2005:1:2:3::/64 via fe80::ec4e:92ff:fecb:a897 ethernet1/1/1 110/20 00:02:04
  O E2 2005:1:4:5::/64 via fe80::ec4e:92ff:fecb:a897 ethernet1/1/1 110/20 00:00:03

• 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 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 summary <prefix> will be advertised to R2".

• OS10# show ipv6 route
  O E2 2005:1::/32 via fe80::ec4e:92ff:fecb:a897 ethernet1/1/1 110/20 00:01:08