[nsp] Links UP/Down

[M.Palis]

Dear all


We are facing a some problems during the last month with links going up/down
simultaneously causing BGP flapping and therefore affecting our traffic and
the traffic of our customers. We have 2 C7507 with connections to upstream
ISPs on both routers and connection to international customers to one of the
routers. The routers are connected together through a Gigabit switch. All
links on both routers (very strange)  go UP/Down at random periods   with
out any cause.

We investigate it with our transmition and the did not find anything. All
links follow a  different path through our transmission.. We change some
line cards on the C7507 again with out success. IOS that we are using is
122-15.T7.

We are thinking now the case of a kind of attack that causes flapping of the
links..

Does anyone of you face a similar situation before?

I will appreciate and help/advice/opinion

REGARDS