BGP AS number per VRF

[carl_townshend]

Hi All

I have a router connected to 2 ISP's and I need to run BGP to each of them, but with separate source AS per connection on my side.

Would this mean I would need to set up 2 separate BGP processes on my router?

cheers

[Julio E. Moisa]

Hi

You cannot have 2 or more BGP AS on a router. BGP allows to have multiple peerings through IPv4 unicast or through Address-family with VRF. For example

router bgp 100

no sync

no auto

neighbor 1.1.1.1 remote 1

neighbor 2.2.2.2 remote 2

[carl_townshend]

OK, What if I want to keep the traffic to each site separate?

Would I just use the same AS source number, but then when I create the address families using VRF's will this allow me to keep the traffic separate on the router?

I wont use route target export/import etc

cheers

[Julio E. Moisa]

Hi

If you are going to use VRF you can separate the routing tables and if it is not going to be used for an MPLS you can remove the route-targets, for example you can have:

ip vrf A

rd 1:1

ip vrf B

rd 2:2

interface g0/0

ip vrf forward A

ip add 1.1.1.2 255.255.255.252

interface g0/1

ip vrf forward B

ip add 2.2.2.1 255.255.255.252

router bgp 100

no syn

no auto

address-family ipv4 vrf A

neighbor 1.1.1.1 remote 1

neighbor 1.1.1.1 activate

address-family ipv4 vrf B

neighbor 2.2.2.2 remote 2

neighbor 2.2.2.2 activate

The traffic will be isolated from each other, but you need to specify what prefixes will be into each VRF.

:-)