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Catalyst 3750-E and 3560-E Switch Software Configuration Guide
OL-9775-02
Chapter 38 Configuring IP Unicast Routing
Configuring Multi-VRF CE
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 38-7 is a simplified example of the physical connections in a network similar to that in
Figure 38-6. 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 Catalyst 3750-E
or 3560-E switch as 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 AS 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 announce using 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.