[nsp] Links UP/Down

Voll, Scott Scott.Voll at wesd.org
Mon Oct 13 10:57:52 EDT 2003


Are you using cisco Gbics? Or a gigbit line card?

-----Original Message-----
From: M.Palis [mailto:security at cytanet.com.cy] 
Sent: Sunday, October 12, 2003 10:48 PM
To: cisco-nsp at puck.nether.net
Subject: [nsp] Links UP/Down

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

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