Cisco Catalyst 4500 Series - Configuring BGP PE to CE Routing Sessions

43-9
Catalyst 4500 Series Switch, Cisco IOS Software Configuration Guide - Cisco IOS XE 3.9.xE and IOS 15.2(5)Ex
Chapter 43 Configuring VRF-lite
Configuring VRF-lite for IPv4
Use the no router ospf process-id vrf vrf-name global configuration command to disassociate the VPN
forwarding table from the OSPF routing process.
The following example shows how to configure a single VRF named VRF-RED:
Switch(config)# ip vrf VRF-RED
Switch(config-vrf)# rd 1:1
Switch(config-vrf)# exit
Switch(config)# router eigrp virtual-name
Switch(config-router)# address-family ipv4 vrf VRF-RED autonomous-system 1
Switch(config-router-af)# network 10.0.0.0 0.0.0.255
Switch(config-router-af)# topology base
Switch(config-router-topology)# default-metric 10000 100 255 1 1500
Switch(config-router-topology)# exit-af-topology
Switch(config-router-af)# exit-address-family
Configuring BGP PE to CE Routing Sessions
To configure a BGP PE to CE routing session, perform this task:
Step 5
Switch(config-router)# network
network-number area area-id
Defines a network address and mask on which OSPF runs
and the area ID for that network address.
Step 6
Switch(config-router)# end
Returns to privileged EXEC mode.
Step 7
Switch# show ip ospf process-id
Verifies the configuration of the OSPF network.
Step 8
Switch# copy running-config
startup-config
(Optional) Saves your entries in the configuration file.
Command Purpose
Command Purpose
Step 1
Switch# configure terminal
Enters global configuration mode.
Step 2
Switch(config)# router bgp
autonomous-system-number
Configures the BGP routing process with the AS number
passed to other BGP routers and enters router
configuration mode.
Step 3
Switch(config-router)# network
network-number mask network-mask
Specifies a network and mask to announce using BGP.
Step 4
Switch(config-router)# redistribute
ospf process-id match internal
Sets the switch to redistribute OSPF internal routes.
Step 5
Switch(config-router)# network
network-number area area-id
Defines a network address and mask on which OSPF runs
and the area ID for that network address.
Step 6
Switch(config-router-af)#
address-family ipv4 vrf vrf-name
Defines BGP parameters for PE to CE routing sessions and
enters VRF address-family mode.
Step 7
Switch(config-router-af)# neighbor
address remote-as as-number
Defines a BGP session between PE and CE routers.
Step 8
Switch(config-router-af)# neighbor
address activate
Activates the advertisement of the IPv4 address family.
Step 9
Switch(config-router-af)# end
Returns to privileged EXEC mode.
Step 10
Switch# show ip bgp [ipv4] [neighbors]
Verifies BGP configuration.
Step 11
Switch# copy running-config
startup-config
(Optional) Saves your entries in the configuration file.