telnet caused trap on switches

[Kevin Melton]

I am the IT Manager of a small network.

We use Cisco Catalyst 3550 switches as well as 2950 switches.

I have configured these boxes to trap back to our manangement station for environemtal concerns. I have the following config on the boxes.

snmp-server community xxx

snmp-server community xxxx

snmp-server host 198.100.100.75 traps khazad

snmp-server enable traps envmon

For some reason, whenever I telnet to one of my switches, it generates a trap called ""tcpConnectionClose". I am not sure why.

What can I do to eliminate the unwanted "telnet" generated traps??

Thank You

[yjdabear]

I recall tcpConnectClose is a tty trap.

I think I read somewhere tty traps are implicitly turned on by default, even if you never configure for it.

You can try explicitly specify what types of traps you want to send:

snmp-server enable traps blah

snmp-server enable traps blah

snmp-server enable traps blah

snmp-server host 198.100.100.75 khazad blah blah blah

[todd.martin-02]

This trap is most likly an indication that your telnet session has closed. Do you see a corrosponding "open" message as well?

In most cases you can tell you NMS (I have HP OpenView) to "not log or display" the alarm.

What is your NMS of choice?

[Kevin Melton]

My NMS is Whats UP Gold ver.7....

Unfortunantly, I only have the ability to "define alerts". These alerts fire when any snmp trap is sent. I somehow have to tell the switches how not to send the TTY trap at the end of the connection.

You cannot use the "no snmp-server enable traps tty" because IOS barks at the TTY in that syntax...

[yjdabear]

That's why you should explicitly define what traps to send:

snmp-server enable traps abc

snmp-server enable traps def

[snmp-server enable traps tty] <- implicitly defined in IOS

snmp-server host 198.100.100.75 khazad abc def

This tells the device to only send traps of types "abc" and "def", but not "tty", to 198.100.100.75.

[mlasarko]

"x25, and tty traps are enabled by default"

http://www.cisco.com/en/US/customer/tech/tk648/tk362/technologies_tech_note09186a0080094a05.shtml

You should be able to filter them out by following the details in the above link.

HTH,

~M