Allied Telesis C613-16164-00 REV E - page 54

CONFIGURE DYNAMIC ROUTING

Configuring a complex inter-VRF solution

Page 54 | Configure VRF-lite

Configure

routing

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

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.

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.

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

Contents

Main Tech nic al G ui de How To | Configure VRF-lite Introduction What is VRF-lite? Who should read this document? Which products and software version does it apply to? Software feature licenses Command summary Contents Glossary Understanding VRF-lite VRF-lite security domains Route table and interface management with VRF-lite Interface management with VRF Route management with VRF Inter-VRF communication Static and dynamic inter-VRF routing VRF-lite features in AW+ Route limiting per VRF instance VRF-aware utilities within AW+ VRF aware services include Page Configuring VRF-lite The following section describes the generic commands used to configure VRF-lite. Page Page Page Static inter-VRF routing Dynamic inter-VRF communication explained The Forwarding Information Base (FIB) and routing protocols VRF blue FIB VRF red FIB Page Inter-VRF communication via BGP Using the route-target command Page Page How VRF-lite security is maintained Viewing source VRF and attribute information for a prefix Simple VRF-lite configuration examples Multiple VRFs without inter-VRF communication Page VRFs accessing a shared network. An example of static inter-VRF routing Dynamic inter-VRF communication with RIP routing to Dynamic inter-VRF communication with BGP routing to external peers Dynamic inter-VRF communication with OSPF routing to Page Page Inter-VRF configuration examples with Internet access Page Page Inter-VRF configuration examples with Internet access Page 36 | Configure VRF-lite Example B COMMUNICATION PLAN VRF3 has communication with VRF1 VRF3 has communication with VRF2 inter-VRF communication is limited to connected interface routes only. Inter- VRF Page Page Page Example C VRF3 has communication with VRF1 VRF3 has communication with VRF2 Page Page Page Configuring a complex inter-VRF solution Network description VRF communication plan Configuration breakdown Page Page Page Page Page Page Page Page Page Page Page Complete show run output from VRF device is below Page Page Page IP route table from VRF device is below Page Page Page Page Page Page Page Page VCStack and VRF-lite x900 x610 DUTA Other features used in this configuration Stack provisioning Virtual Chassis ID X610 VCStack configuration x900 configuration Page Sharing VRF routing and double tagging on the same port x610 A x610 B Communication plan Configurations x610 A x610 B Page Dynamic inter-VRF routing between the global VRF domain and a VRF instance Additional notes BGP configuration tips Page Dynamic inter-VRF communication with i-BGP routing to external peer Dynamic inter-VRF communication with e-BGP routing to external peer Page Route Limits Configuring static route limits Configuring Dynamic route limits max-fib-routes no max-fib-routes VRF-lite usage guidelines Useful VRF-related diagnostics command list General VRF Routing general Routing protocols Page ARP HW platform table commands TCPdump