Hi
It is not extrange, just one interface is not receiving a "hardware
down"
problable the CSU/DSU is still up, and the router is sending "hello"
packets over and over. After 3 hellos, without answer, the router resets
the interface (you see it going down) waits a little, and starts the
hole
process again.
If you see the interface counters (show int s...) you can see this
behaviour
Regards.
Oliver Stock wrote:
>
> Hi all,
>
> I'm experiencing some strange behaviour of a serial interface in a cisco
> 7206VXR. When the counterside is down, this interface should be down too,
> but is flapping instead. I've checked the configs of both interfaces but
> haven't found any irregularities. Keepalives are set, both interfaces are
> using HDLC as encapsulation. The only point I'm not sure about is both
> interfaces using IP unnumbered Loopback0, but we have other interfaces
> running with this without problems (shouldn't be a problem in a serial
> 1-to-1-connection at all). There is a VPN-connection running over this
> interface.
> IOS-Version of this router is 12.0(13)S, the flapping interface is
> channelized E1. Does anybody has any idea, what can cause such a behaviour?
> Thx in advance,
> Oliver Stock
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