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Cisco Catalyst Switch Module 3110 and 3012 for IBM BladeCenter Software Configuration Guide
OL-12189-01
Chapter 38 Configuring IP Unicast Routing
Configuring Multi-VRF CE
Use the no router ospf process-id vrf vrf-name global configuration command to disassociate the VPN
forwarding table from the OSPF routing process.
Configuring BGP PE to CE Routing Sessions
Beginning in privileged EXEC mode, follow these steps to configure a BGP PE to CE routing session:
Use the no router bgp autonomous-system-number global configuration command to delete the BGP
routing process. Use the command with keywords to delete routing characteristics.
Multi-VRF CE Configuration Example
Figure 38-8 is a simplified example of the physical connections in a network similar to that in
Figure 38-7. OSPF is the protocol used in VPN1, VPN2, and the global network. BGP is used in the
CE-to-PE connections. The examples following the illustration show how to configure a switch as a CE
Switch A, and the VRF configuration for customer switches D and F. Commands for configuring CE
Switch C and the other customer switches are not included but would be similar. The example also
includes commands for configuring traffic to Switch A for a Catalyst 6000 or Catalyst 6500 switch acting
as a PE router.
Command Purpose
Step 1
configure terminal Enter global configuration mode.
Step 2
router bgp autonomous-system-number Configure the BGP routing process with the
autonomous-system number passed to other BGP routers,
and enter router configuration mode.
Step 3
network network-number mask
network-mask
Specify a network and mask to advertise through BGP.
Step 4
redistribute ospf process-id match
internal
Set the switch to redistribute OSPF internal routes.
Step 5
network network-number area area-id Define a network address and mask on which OSPF runs
and the area ID for that network address.
Step 6
address-family ipv4 vrf vrf-name Define BGP parameters for PE to CE routing sessions, and
enter VRF address-family mode.
Step 7
neighbor address remote-as as-number Define a BGP session between PE and CE routers.
Step 8
neighbor address activate Activate the advertisement of the IPv4 address family.
Step 9
end Return to privileged EXEC mode.
Step 10
show ip bgp [ipv4] [neighbors] Verify BGP configuration.
Step 11
copy running-config startup-config (Optional) Save your entries in the configuration file.
