Hmm, correct me if I'm wrong, but shouldn't the CSU/DSU signalize only line and clocking problems? When I debug the interface, I can see that keepalives are sent and received normaly. There is no restriction in communication between the interfaces, no errors. Only when I shut one interface the other is starting to flap. I always thought that keepalives should prevent interfaces from flapping because they should go down after not receiving a response for three times? Thx in advance Oliver "Javier Contreras" wrote in message [EMAIL PROTECTED]">news:[EMAIL PROTECTED]... > 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 > -- > --- > Javier Contreras Albesa > Professional Trainer > > PRO IN Training S.L. > PROfessional Information Networks > World Trade Center, Moll de Barcelona S/N > Edif Sur, Planta 4 > > Phone: (+34) 93-5088850 E-mail: > [EMAIL PROTECTED] > Fax: (+34) 93-5088860 Internet: http://www.proin.com > > SHAPING THE FUTURE - BE PART OF IT! Message Posted at: http://www.groupstudy.com/form/read.php?f=7&i=1580&t=1580 -------------------------------------------------- FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
