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Webcast-Catalyst9k
New Member

How to clear vty line on Cat6500

Hi,

Can you please advise on how to clear vty line?  Please see below. A sh tcp <line number> shows that the TCB is waiting for TCP Process.  The TCP processs TCB is waiting for is SSH.  I believe because of this ssh process still running, the vty line cannot be cleared.

Can you please advise if this is the case and how do we resolve the problem.

TIA.

PF

sh users

   Line       User       Host(s)             Idle       Location

   1 vty 0     pf         10.10.20.8                                   9w1d 10.10.1.54

   2 vty 1     pf         10.10.1.16                                35w0d 10.10.1.54

   3 vty 2     pf         10.10.1.16                                 1y14w 10.10.1.54

   4 vty 3     pf         10.10.1.15                                   2w1d 10.10.1.54

* 5 vty 4     pf         idle                 00:00:00 10.10.1.54

Interface     User       Mode                     Idle     Peer Address

sh tcp 1

tty1, virtual tty from host 10.10.1.54

Connection state is CLOSED, I/O status: 10, unread input bytes: 0

Mininum incoming TTL 0, Outgoing TTL 255

Local host: 10.10.1.3, Local port: 22

Foreign host: 10.10.1.54, Foreign port: 61532

TCB is waiting for TCP Process (3)

sh tcp 2

tty2, virtual tty from host 10.10.1.54

Connection state is CLOSED, I/O status: 10, unread input bytes: 0

Mininum incoming TTL 0, Outgoing TTL 255

Local host: 10.10.1.3, Local port: 22

Foreign host: 10.10.1.54, Foreign port: 11408

TCB is waiting for TCP Process (106)

sh tcp 3

tty3, virtual tty from host 10.10.1.54

Connection state is CLOSED, I/O status: 10, unread input bytes: 0

Mininum incoming TTL 0, Outgoing TTL 255

Local host: 10.10.1.3, Local port: 22

Foreign host: 10.10.1.54, Foreign port: 55312

TCB is waiting for TCP Process (150)

sh tcp 4

tty4, virtual tty from host 10.10.1.54

Connection state is CLOSED, I/O status: 10, unread input bytes: 0

Mininum incoming TTL 0, Outgoing TTL 255

Local host: 10.10.1.3, Local port: 22

Foreign host: 10.10.1.54, Foreign port: 35430

TCB is waiting for TCP Process (151)

sh process | i SSH

   3 Mwe 41653940         5208     15380     338 9180/12000 1 SSH Process

106 Mwe 41653940         4764     18323     260 9184/12000 2 SSH Process

150 Mwe 41653940       10024     21542     465 6876/12000 3 SSH Process

151 Mwe 41653940         1556       2339     665 9180/12000 4 SSH Process

1 ACCEPTED SOLUTION

Accepted Solutions
Cisco Employee

How to clear vty line on Cat6500

Hi,

Try the following:

     show tcp brief //find corressponding TCB#

     clear tcp tcb

You may also want to add service tcp-keepalives-in for make the 6500 clear any hung sessions.

Kind Regards,
Ivan

**Please grade this post if you find it useful.

Kind Regards, Ivan Shirshin **Please grade this post if you find it useful.
7 REPLIES
Hall of Fame Super Gold

How to clear vty line on Cat6500

clear line

New Member

How to clear vty line on Cat6500

Leo,

Thanks for your reply.  I have tried it before.  It will accept the command but will not clear it.

Thanks.

PF

Cisco Employee

How to clear vty line on Cat6500

Hi,

Try the following:

     show tcp brief //find corressponding TCB#

     clear tcp tcb

You may also want to add service tcp-keepalives-in for make the 6500 clear any hung sessions.

Kind Regards,
Ivan

**Please grade this post if you find it useful.

Kind Regards, Ivan Shirshin **Please grade this post if you find it useful.
New Member

Re: How to clear vty line on Cat6500

Ivan,

Thanks for you reply.  We have service tcp-keepalives-in configured.

I did the following.  Is it right?   It didn't seem to work.

Thanks.

PF

clear tcp tcb ?
  <0x0-0xFFFFFFFF>  TCB address

6500#clear tcp tcb 48735680
[confirm]
[OK]

sh tcp bri

TCB       Local Address               Foreign Address             (state)

48735680  10.10.1.3.57494             10.10.20.8.22                ESTAB

487DA60C  10.10.1.3.22                10.10.1.54.18073             ESTAB

535B58A0  10.10.1.3.62226             10.10.10.22.49               ESTAB

4866175C  10.10.1.3.21890             10.10.1.15.22                ESTAB

48679D78  10.10.1.3.26286             10.10.1.16.22                ESTAB

5345FAFC  10.10.1.3.52693             10.10.1.16.22                ESTAB

48614ACC  10.10.1.3.58273             10.10.10.22.49               ESTAB

Cisco Employee

Re: How to clear vty line on Cat6500

Could you share the IOS version, please? Also, were any show commands with redirect option used?

Kind Regards, Ivan Shirshin **Please grade this post if you find it useful.
New Member

How to clear vty line on Cat6500

Ivan,

Thanks very much for your direction.  It is working now.  After clearing of tcp tcb, the tcb came up with the status "closed". A clear line will remove it then.

Again thanks vey much.

PF

sh tcp bri

TCB       Local Address               Foreign Address             (state)

48735680  10.10.1.3.57494             10.10.20.8.22                CLOSED

487DA60C  10.10.1.3.22                10.10.1.54.18073             ESTAB

48768B14  10.10.1.3.36334             10.10.10.22.49               ESTAB

4866175C  10.10.1.3.21890             10.10.1.15.22                ESTAB

48679D78  10.10.1.3.26286             10.10.1.16.22                ESTAB

5345FAFC  10.10.1.3.52693             10.10.1.16.22                ESTAB

533FC418  10.10.1.3.49165             10.10.10.22.49               ESTAB

Cisco Employee

How to clear vty line on Cat6500

welcome!

Kind Regards, Ivan Shirshin **Please grade this post if you find it useful.
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