Configure Dynamic Routing

Configuring a complex inter-VRF solution

Configure Dynamic routing protocols are configured as required and associated with each VRF. routing

OSPF instance 1 is associated with VRF red. OSPF instance 2 is associated with VRF orange. RIP and BGP use address-families as the equivalent of OSPF instances. A RIP ipv4 address- family is created and associated with VRF blue. Appropriate IP networks are allocated to each routing protocol instance or address-family. BGP inter-VRF routes are imported and redistributed via each routing protocol instance or address-family. This allows each external peer router connected in each VRF domain to be taught filtered routes to subnets in VRF shared.

The command default-information originate ensures that OSPF or RIP within each VRF instance redistributes, and advertises to external peers in each VRF instance, a static default route to access the Internet via VRF shared.

awplus(config)#router ospf 1 red awplus(config-router)#network 192.168.10.0/24 area 0 awplus(config-router)#redistribute bgp awplus(config-router)#default-information originate awplus(config-router)#exit awplus(config)#router ospf 2 orange awplus(config-router)#network 192.168.40.0/24 area 0 awplus(config-router)#redistribute static awplus(config-router)#redistribute bgp awplus(config-router)#default-information originate awplus(config-router)#exit awplus(config)#router rip awplus(config-router)#address-family ipv4 vrf blue awplus(config-router-af)#network 192.168.30.0/24 awplus(config-router-af)#redistribute bgp awplus(config-router-af)#default-information originate awplus(config-router-af)#exit-address-family awplus(config-router)#exit

BGP with ASN 100 is configured. BGP is used to provide inter-VRF communication.

BGP address-families are created. Each BGP address-family is associated with a VRF instance, excluding VRF overlap. There is no route leakage to or from VRF overlap, so VRF overlap does not require an associated BGP address-family to be configured.

Via the address-families, routes (prefixes) from each routing protocol associated with each VRF instance are redistributed into BGP100. Via the VRF export maps, and ACLs they are subsequently leaked to and from VRF shared.

Connected (interface) routes and OSPF instance 1 routes associated with VRF red are imported and redistributed into BGP100.

Page 54 Configure VRF-lite

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