Thursday, June 18, 2020

Moving an exsiting BGP peer to a different interface on the same device without downtime, possible?

We have an upstream bgp peer on our ASR9001 that is connected through a vlan provided by a third-party provided transport. We will now change this transport provider to someone else. The vlan ID, as well as the PtP IP address of the BGP session will not change.

The only thing that changes is the physical interface (e..g te/0/0/1 to te0/0/2). Unfortunately the ptp subnet is a /31 so it is not possible to setup a secondary bgp session.

Is it possible to migrate the config to the new interface without causing the bgp to drop?

We will be able to keep the vlan active on both the old and the new link but I am not sure if that will help as we would then have to put the same IP address on both interfaces.



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