06-09-2010 04:26 PM - edited 03-04-2019 08:44 AM
RouterA is connected to RouterB across a 1.54mbps T1. The WAN link is addressed with 192.168.0.0/30 and runing ospf in area 0. I have a requirement for two seperate vrf's to be maintained aross the WAN link. How can this be done if there's only one /30 between the routers? A sample configuration would be great. Thanks in advance.
06-09-2010 06:26 PM
David,
You have to use VRF-lite for that but you can not do it with 1 /30 subnet. If you need 2 VRFs then you need two /30s. It could also be one global with a /30 and one VRF with /30.
Here is a cofing guide on how to configure it:
http://www.cisco.com/en/US/docs/switches/lan/catalyst4500/12.1/20ew/configuration/guide/vrf.html
HTH
Reza
06-10-2010 03:25 AM
Hello David,
if you can enable MPLS between the two routers, that means to use the same IGP routing protocol, if you enable LDP you can use the serial link as an MPLS backbone link between the two PE nodes.
mpls ip
mpls ldp router-id loop0 force
! loop0's ip address has to be advertised in IGP
int ser0/0
mpls ip
and you need also BGP multiprotocol with VPNv4 address family and one address-family for each VRF
router bgp ASN
neigh PE2 remote-as ASN
neigh PE2 update-source loop0
address-family vpnv4
neigh PE2 activate
neigh PE2 send-community both
address-family ipv4 vrf VRFname1
red connected
! other commands here if needed
Hope to help
Giuseppe
06-10-2010 04:08 AM
you may also use frame-relay encapsulation and configure two vc's ,
or, if the T1 line is structured, you may create two channel groups.
Juergen.
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