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Software Configuration Guide—Release IOS XE 3.6.0E and IOS 15.2(2)E
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Chapter 41 Configuring VRF-lite
Configuring VRF-lite for IPv4
To configure OSPF in the VPN, perform this task:
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:
Command Purpose
Step 1
Switch# configure terminal
Enters global configuration mode.
Step 2
Switch(config)# router ospf
process-id vrf vrf-name
Enables OSPF routing, specifies a VPN forwarding table,
and enters router configuration mode.
Step 3
Switch(config-router)#
log-adjacency-changes
(Optional) Logs changes in the adjacency state (the default
state).
Step 4
Switch(config-router)# redistribute
bgp autonomous-system-number subnets
Sets the switch to redistribute information from the BGP
network to the OSPF network.
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
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.