Contents
What is inter-VRF routing?
A route distinguisher is simply a unique number stored beside each route in the routing table to associate it with its VRF and maintain uniqueness should two or more VRFs have overlapping address space (for example, if all three of our customers were addressed out of the 10.0. 0.0/8 network).
How do you leak routes between VRF and global routing table?
Route leaking between Global Routing Table (GRT) and Virtual Routing and Forwarding (VRF) table is quite easy with the use of static routes. You either provide the next-hop IP address (for multi-access segment) or point the route out of an interface (point-to-point interface).
What is RD and RT in BGP?
The Route-Distinguisher (RD) & Route-Target (RT) are two different concepts that are both used in an MPLS VPN. The RD is used to keep all prefixes in the BGP table unique, and the RT is used to transfer routes between VRF’s/VPNS.
What is VRF table label?
Map the inner label of a packet to a specific VPN routing and forwarding (VRF) instance. When you include the vrf-table-label statement in the configuration of a VRF routing instance, a label-switched interface (LSI) logical interface label is created and mapped to the VRF routing table.
Can you use BGP to route between VRFs?
I am having trouble routing between VRFs using BGP. In my lab there is a hub router with one spoke. I am using MP-BGP to extend VRFs between the two. I want to attach a firewall to the hub with a sub-interface in each VRF. I would like the firewall to run BGP to the hub and be the exchange point between VRFs.
How to configure a router ID for a VRF?
A router ID can also be configured per BGP address family. To configure MP-BGP, we configure a separate address family within BGP for each VRF and simply redistribute all connected and OSPF-learned routes within that VRF. We can verify that each BGP address family now maintains routes for its respective VRF.
Are there any routes from VRF red to VRF Green?
Now VRF Shared has routes from VRFs Red and Green, and VRFs Red and Green each have the route from VRF Shared (it may take a minute for the routes to appear in the table): VRF Blue, however, still contains only its own routes, as we did not configure import or export for this VRF:
How are VRF instances used in VRF Lite?
In Intro to VRF lite, we looked at how virtual routing and forwarding (VRF) instances can be employed to logically separate the layer three topologies of unrelated entities sharing a single physical infrastructure.