North American Network Operators Group

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Loss of Telnet Capability to 6509

  • From: Richard J. Sears
  • Date: Wed Jul 28 15:01:28 2004

We posted this to cisco-nsp but someone suggested posting it here as

We have a 6509 running a SUP720 in IOS only mode (no cat os). 

At around 4am this morning, we lost our ability to telnet to the router.
Running a tcpdump shows that the router never responds to the telnet

All functions and interfaces on the router seem fine (bgp, etherchannel,
ibgp, vtp, hsrp) and I can console into the sup with no problems at all,
we just cannot telnet into it. The CPU is at around 6%.

I have checked all access lists on the router, none were added/removed
or modified on line vty that would cause this problem. All logging
appears normal.

We are running Version 12.2(17a)SX3.

Anyone have a similar problem or know how to check or restart the telnet
process on the router without a reload...?

Richard J. Sears
Vice President         
American Digital Network                          
[email protected]
858.576.4272 - Phone
858.427.2401 - Fax
INOC-DBA - 6130

I fly because it releases my mind 
from the tyranny of petty things . . 

"Work like you don't need the money, love like you've
never been hurt and dance like you do when nobody's