we already have a router BGP process of 3x7x3. How can we create another process with router bgp 65xxx on the same ASR router ?

[mdkulkarni]

we already have a router BGP process of 30763.  can I create another process  router bgp 65xxx  on the same  ASR router ?

[Muhammad Thanveer]

Dear Kulkarni,

If we already have a process of BGP with an Autonomous system number 30763, you cannot create an other bgp process with other AS on the same router.

If you try to configure the same, it will throw an error as below.

R1(config)#router BGP 65535
BGP is already running; AS is 30763

But in any of the cases if you want to use an other BGP process for any neighbor you can use this as

R1(config)#router BGP 30763
R1(config)#neighbor 2.2.2.2 remote-as 55486
R1(config)#neighbor 2.2.2.2 local-as 65535

now in other rotuer i.e..e router 2, it can peer with the router 1 as
R2(config)#router BGP 55486
R2(config)#neighbor 1.1.1.1 remote-as 65535

However I have heard that we can have multiple BGP instances in ASR9k with XR 4.2.x.
Commands are as below. Please visit https://supportforums.cisco.com/discussion/11719386/bgp-multi-instances

router bgp 3 instance vpn2

     bgp router-id 20.0.0.2

     address-family vpnv4 unicast

     neighbor 20.0.101.2

         remote-as 200

router bgp 3 instance vpn1

     bgp router-id 20.0.0.1

     address-family vpnv4 unicast

     neighbor 20.0.101.1

         remote-as 200

BR
Mohammad Thanveer
"Please Rate All Helpful Posts"

[mdkulkarni]

Mohmmad,

Thank you ,Appreciate it. 

I will keep you posted , with what solution we do .

[Muhammad Thanveer]

Dear Friend, Please keep posted, it's always good to hear that something good happened.

[mdkulkarni]

We configured it using no prepend replace-as commands.

Thanks,

Manish.