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Unable to clear vty session on 3750

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Djamel.Bouazza at tecteo

Jul 31, 2012, 2:29 AM

Post #1 of 3 (810 views)
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Unable to clear vty session on 3750

Hi all,

I have an issue today with nombers of vty sessions.We have no console access for this device.See below please :

750_DataCenter#sh users
Line User Host(s) Idle Location
1 vty 0 adminit idle 1d01h scavone-02.ale.be
2 vty 1 adminit idle 1d01h scavone-02.ale.be
3 vty 2 adminit idle 1d01h scavone-02.ale.be
4 vty 3 adminit idle 17:33:17 probook012.staff.win.be
5 vty 4 adminit idle 16:59:13 probook012.staff.win.be
6 vty 5 adminit idle 16:15:11 probook012.staff.win.be
7 vty 6 adminit idle 16:47:55 probook012.staff.win.be
8 vty 7 adminit idle 16:40:58 probook012.staff.win.be
9 vty 8 adminit idle 16:13:12 probook012.staff.win.be
10 vty 9 adminit idle 16:12:34 probook012.staff.win.be
11 vty 10 adminit idle 16:10:46 probook012.staff.win.be
12 vty 11 adminit idle 15:41:14 probook012.staff.win.be
13 vty 12 adminit idle 00:01:52 probook012.staff.win.be
14 vty 13 admin idle 00:00:06 212-166-0-248.win.be
* 15 vty 14 adminit idle 00:00:00 lap104.ale.be

When I cleared , I have the same output
3750_DataCenter_VOO#clear line vty 10
[confirm]
[OK]
3750_DataCenter#sh users
Line User Host(s) Idle Location
1 vty 0 adminit idle 1d01h scavone-02.ale.be
2 vty 1 adminit idle 1d01h scavone-02.ale.be
3 vty 2 adminit idle 1d01h scavone-02.ale.be
4 vty 3 adminit idle 17:34:00 probook012.staff.win.be
5 vty 4 adminit idle 16:59:56 probook012.staff.win.be
6 vty 5 adminit idle 16:15:54 probook012.staff.win.be
7 vty 6 adminit idle 16:48:38 probook012.staff.win.be
8 vty 7 adminit idle 16:41:40 probook012.staff.win.be
9 vty 8 adminit idle 16:13:55 probook012.staff.win.be
10 vty 9 adminit idle 16:13:17 probook012.staff.win.be
11 vty 10 adminit idle 16:11:28 probook012.staff.win.be
12 vty 11 adminit idle 15:41:57 probook012.staff.win.be
13 vty 12 adminit idle 00:00:20 probook012.staff.win.be
14 vty 13 admin idle 00:00:13 212-166-0-248.win.be
* 15 vty 14 adminit idle 00:00:00 lap104.ale.be

Version is : Version 12.2(53r)SE1, RELEASE SOFTWARE (fc1)

Thanks in advance for your help.
Djamel Bouazza

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nick at foobar

Jul 31, 2012, 4:02 AM

Post #2 of 3 (722 views)
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Re: Unable to clear vty session on 3750 [In reply to]

On 31/07/2012 10:29, Bouazza Djamel wrote:
> I have an issue today with nombers of vty sessions.We have no console
> access for this device.See below please :

three options here:

1. configure a timer on the vty and use TCP keepalives to stop this from
happening in future:

switch#conf t
switch(config)#service tcp-keepalives-in
switch(config)#service tcp-keepalives-out
switch(config)#line vty 0 15
switch(config)# exec-timeout 5

If this fails to clear things after 30 minutes, then try:

2. clear the TCB (transmission control block - an internal TCP data
structure) for each vty line.

You can get the TCB id for each line using:

switch#show tcp brief

It's in the first column. Confirm it first with:

switch#show tcp tcb <tcbid>

You can clear the TCB using:

switch#clear tcp tcb <tcbid>

If this fails:

3. reboot.

Probably #2 will work this time and #1 will prevent the problem from
recurring in future.

Nick

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diosbejgli at gmail

Jul 31, 2012, 6:08 AM

Post #3 of 3 (723 views)
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Re: Unable to clear vty session on 3750 [In reply to]

Hi,

Try the 'clear line vty <num>' command as well to clear out the stuck session.

The version number you provided is the rommon version, you need the
first line of 'sh ver' instead. You might be hitting CSCte52821
though.

Best regards,
Andras

On Tue, Jul 31, 2012 at 1:02 PM, Nick Hilliard <nick [at] foobar> wrote:
> On 31/07/2012 10:29, Bouazza Djamel wrote:
>> I have an issue today with nombers of vty sessions.We have no console
>> access for this device.See below please :
>
> three options here:
>
> 1. configure a timer on the vty and use TCP keepalives to stop this from
> happening in future:
>
> switch#conf t
> switch(config)#service tcp-keepalives-in
> switch(config)#service tcp-keepalives-out
> switch(config)#line vty 0 15
> switch(config)# exec-timeout 5
>
> If this fails to clear things after 30 minutes, then try:
>
> 2. clear the TCB (transmission control block - an internal TCP data
> structure) for each vty line.
>
> You can get the TCB id for each line using:
>
> switch#show tcp brief
>
> It's in the first column. Confirm it first with:
>
> switch#show tcp tcb <tcbid>
>
> You can clear the TCB using:
>
> switch#clear tcp tcb <tcbid>
>
> If this fails:
>
> 3. reboot.
>
> Probably #2 will work this time and #1 will prevent the problem from
> recurring in future.
>
> Nick
>
> _______________________________________________
> cisco-nsp mailing list cisco-nsp [at] puck
> https://puck.nether.net/mailman/listinfo/cisco-nsp
> archive at http://puck.nether.net/pipermail/cisco-nsp/
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