iBGP Peering

Assume the following physical topology:

R1---R2---R3 : Ipv4 and OSPF are configured.

There are all in different AS and they are all border routers.

R2 has ebgp peering with R1 and R3.
R1 has ebgp peering with R2 only.
R3 has ebgp peering with R1

R1 has no ebgp peering with R3.
R3 has no ebgp peering with R2.

Will they be able to ping one another?

Can bgp peering be unidirectional?

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Comments

zeetskeet

You are contradicting your statements.

"R3 has ebgp peering with R1 "
"R1 has no ebgp peering with R3."

However, I think I know what you mean.

R1----R2----R3

R1 doesn't have to be a peer with R3 to be able to ping it, if R2 advertises that network to R1. Internet is BGP, you just need to know how to get from one end to another, not all BGP routers are meshed together to be able to forward traffic from one end of the world to another.

BGP peering can't be uni-directional, it has to be configured on both ends.

dppagc

Hey you are contradicting yourself. On the 1st paragraph you say not all BGP routers are meshed together and they can ping.

However, in the 2nd paragraph you say that "BGP peering can't be uni-directional, it has to be configured on both ends." What do you mean?

fredrikjj

The questions can't really be answered because they have nothing to do with the scenario that you've laid out.