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GRE VPN as Backup Link Issue

Patrick McHenry
Level 4
Level 4

Hi,

been labing a backup solution using a GRE VPN link. The primary connection is a  BGP Link. See attached.

I was hoping someon could explain the behavior I'm seeing.

I have a constant ping going from the HQ Site to the Remote sites loopback amd the Remote site to the HQs loopback..

The HQ router and the Remote Site router are using the BGP routes initially. When I shut the interface facing the Remote Site on the BGP WAN Provider router, the Remote site only drops one ping but, the HQ site ping fails for about 30 seconds and then picks up after it gets the EIGRP route to the Remote Site over the GRE tunnel. Is this normal behavior as it has to wait for the BGP route to time out?

Also, when I bring the interface back up on the BGP WAN Provider, the BGP routes don't come back. I have to manually do a clear ip eigrp neighbor on the Remote Site Router or the HQ router.

Thank you, Pat.

15 Replies 15

Correct. But EIGRP summary is preferred over eBGP.

Thanks.