24.8.2 Configuring route summarization and summarized route advertisement

Configure summarization of directly connected routes and RIPng routes as summarization source routes. Also, configure the switch to re-advertise the summarized routes and directly connected routes by BGP4+ without re-advertising the directly connected routes and RIPng routes that have become summarization source routes.

Figure 24-8: Configuration in which summary routes are advertised by BGP4+

Points to note

To generate a summarized route, use the ipv6 summary-address command. Use the redistribute summary command to configure BGP4+ to advertise the summarized route.

Command examples

1. (config)# interface vlan 10

   (config-if)# ipv6 address 2001:db8:1:fe01::1/64

   Sets the IPv6 address 2001:db8:1:fe01::1/64 for interface vlan 10.

2. (config-if)# exit

   (config)# interface vlan 20

   (config-if)# ipv6 address 2001:db8:1:ff01::1/64

   Sets the IPv6 address 2001:db8:1:ff01::1/64 for interface vlan 20.

3. (config-if)# ipv6 rip enable

   Enables RIPng packet transmission and reception on interface vlan 20.

4. (config-if)# exit

   (config)# ipv6 summary-address 2001:db8:1:ff00::/56 summary-only

   Configures the switch to generate the summarized route 2001:db8:1:ff00::/56. By specifying summary-only, you suppress re-advertisement of the summarization source routes.

5. (config)# router bgp 100

   (config-router-af)# neighbor 2001:db8:3:ffff::2 remote-as 200

   Establishes a BGP4 connection with neighboring router 2001:db8:3:ffff::2.

6. (config-router)# address-family ipv6

   (config-router-af)# redistribute summary

   Uses BGP4+ to re-advertise the summarized route.

7. (config-router-af)# redistribute connected

   Uses BGP4+ to re-advertise the directly connected route.

8. (config-router-af)# redistribute rip

   Uses BGP4+ to re-advertise the RIPng route.

9. (config-router-af)# neighbor 2001:db8:3:ffff::2 activate

   Enables exchanging routes with the neighboring router 2001:db8:3:ffff::2.