Loss of Telnet Capability to 6509

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1

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

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
request.

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...?

2

Richard J. Sears wrote:

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

Isnt't here a maximum of VTY's that can be used at one time? Perhaps that's the problem. From the console what does the swtich say if you do a "show users" or "who" ?

If it shows users, then there are some other connections using the VTY's and probably not permitting any more connections.

Try clearing the vty's if you think they are stale.

3

Hi Robert -

There is only a single connection to vty 2 (which I cannot clear) other
than that, there are no other connections at all.