From: Barry J. Bocaner (barry@xxxxxxxxxxx)
Date: Thu Jan 04 2001 - 12:41:56 GMT-3
On Thu, 4 Jan 2001, Robert DeVito wrote:
> I am working on ccbootcamp lab #16. On task 5, number 4 it states "tunnel is
> flapping because of recursive routes" I ran into this problem and what I
> had to do to get this working is prevent R8 from advertising routes into the
> VPN tunnel. My question is why? Why did these routes caused the tunnel to
> flap?
If a router learns about it's tunnel destination address over the tunnel
it will try to send the GRE (or whatever tunnel mode you are
using) packets over the tunnel itself... that won't work! Use a
distribute list to prevent each side from advertising it's tunnel source
address to the other side over the tunnel.
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Barry J. Bocaner
Sr. Network Engineer TruEdge Technologies
<barry@truedge.com> 703-573-9884 x 103
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