1. How to configure BGP incoming traffic & outgoing Traffic?

[raj11govind]

1. How to configure BGP incoming traffic & outgoing Traffic?
2. How to configure BGP primary if it goes down and switch over to secondary automatically?
3. What is a router reflector? Why use a Router reflector? What is the purpose?
4. What is BGP split Horizon rule?
5. What are Mpls in RD & RT, Mpls VRf?
Difference b/w VRF & vrf elite?

[MHM Cisco World]

this need three page answer. 
try post your Q one by one.

[Harold Ritter · Accepted solution]

Hi @raj11govind ,

> 1. How to configure BGP incoming traffic & outgoing Traffic?

You would normally control inbound/outbound traffic using route-map (route-policies in IOS-XR).

> 2. How to configure BGP primary if it goes down and switch over to secondary automatically?

You can prefer incoming routes from a primary neighbor using local preference. You can also advertise routes to your neighbors using AS PATH prepends make them preferred on the primary side. Traffic should automatically fail over to the secondary, once the primary goes down.

> 3. What is a router reflector? Why use a Router reflector? What is the purpose?

BGP will not advertise routes learnt via iBGP to another iBGP neighbor by default, therefore a iBGP full mesh is required. The concept of route reflector has been introduced to alleviate this restriction. Route reflectors will advertise iBGP leant routes to iBGP peers and to route reflection clients.

> 4. What is BGP split Horizon rule?

BGP advertise the best path to all peers (given the above restrictions), except the peer from which the best path is received.

> 5. What are Mpls in RD & RT, Mpls VRf?

- Route descriptor (RD) is a value that is added to a VPNv4 or VPNv6 route to make it unique in the the MPLS VPN context. 

- Route target (RT) is an extended community that is attached to a MPLS VPN route and is used to control the import/export process for this route from/to specific PE/VRFs.

- Virtual routing and forwarding (VRF) is a separate routing table instance that is used to isolate different customers/entities. 

> Difference b/w VRF & vrf elite?

The term VRF lite is normally used when the VRF concept is used without the full MPLS infrastructure. So if you just configure a VRF on a router for the purpose of creating a local isolation from the global routing table of from other VRFs, you can actually say that you are configuring VRF lite.

Regards,