BGP_Question

[Ibrahim Jamil]

Hi Experts

kindly see attached

I have seen  a Ciscopress routing video , i notice that the WAN Links towards BB1 and BB2 Represents the ISPs are advertised in BGP,is that possible?when we need this type of setup?i think its wrong setuppls clear my confusion

thanks

jamil

[John Blakley]

Jamil,

This setup is fine. Router R1 is advertising the subnet that's peering with the ISP. The ISP can advertise this as well instead of the "customer". The problem that you'll see is a RIB-failure if both sides are advertising the same network because R1 would see the advertised route and inferior to the locally connected route. Otherwise, if the ISP is not advertising that space, then R1 should advertise it so others will know how to get to your internal networks: the loopback in this case.

HTH,

John

[Ibrahim Jamil]

Hi John

thanks for ur reply

but i haven't see this setup ever , this is not real world scenario