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michel.renfer
Beginner

BGP Multi-Instances

Hi All

The feature BGP Multi-Instances seems to be supported since XR 4.2.x on ASR9k. Unfortunatly there is no specific feature description included in the  configuration guides. Could anyone of the XR cracks help out with more specifics about this feature?

cheers,

michel

2 REPLIES 2
Alexei Kiritchenko
Cisco Employee

Hi Michel,

May be it is not ready yet?

Here are some facts:

Each BGP instance is a separate process.

The BGP instances do not share any prefix table between them

The BGP instances do not communicate with each other and do not set up peering with each other

Only VPNv4/VPNv6/RT-Constrain address-families can be shared between more than one BGP instances. VPNv4/VPNv6  if shared across instance can not share any VRF tables

All VRFs with extranet dependencies must be restricted to a single BGP instance. It will not be possible to import between instances.

MDT SAFI, MVPN SAFI and MVPN-specific BGP knob should be configured on a single instance only. Users need to make sure that all multicast VRFs are configured on the same instance. This instance will communicate with multicast processes.

IPv4 /IPv6 Unicast and corresponding IPv4/IPv6 Labeled-unicast should be configured on the same instance. It is possible to have IPv4 Unicast and IPv4 Labeled-unicast on one instance and IPv6 Unicast and IPv6 Labeled-Unicast on another instance

All global peering addresses must be unique across instances.

Each instance must be configured with an unique BGP router-id

Current maximum number of recommended instances that can be placed on a single RP is limited to 2

Config Example

!

router bgp 3 instance vpn2

     bgp router-id 20.0.0.2

     address-family vpnv4 unicast

     neighbor 20.0.101.2

         remote-as 200

         address-family vpnv4 unicast

             route-policy inbound in

             route-policy outbound out

         !

      !

   !

router bgp 3 instance vpn1

     bgp router-id 20.0.0.1

     address-family vpnv4 unicast

     neighbor 20.0.101.1

         remote-as 200

         address-family vpnv4 unicast

             route-policy inbound in

             route-policy outbound out

         !

      !

!

Regards,

/A

Please visit http://cisco.com/go/testdrive or contact your account rep to schedule nV tech demo.

Guys, do you have any docs related to that functionality?

I was going to test it, but encountered with some issues.

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