Trunk Port Monitoring

[Kumar Krishnamurthy]

Hi,

We have 8 Switches running various Vlans and thus formed like a ring. There are 5 MAN Links interconnecting these switches, remaining locations it's been connected by back-to-back ethernet cables.

All of the MAN interface connections configured as TRUNK.

We have noticed that during MAN outage the TRUNK interface showed as int up/proto up.

What is the SNMP MIB we supposed to poll to get the * real * status of MAN connection ...

Any help is really appreciated ..

regards

krk

[paddyxdoyle]

Hi,

Do your switches support trunk negotation via DTP?

It sounds like you have your DTP mode set to on, so that it trunks unconditionally, even if there are problems with the line the interface will still show as trunking.

If you can, set your trunks to desirable at both ends and your syslog messages etc will reflect the true state of your interface.

I think this the Cisco recommended way.

HTH

Paddy

[Kumar Krishnamurthy]

Hi,

All of the trunks forced to dot1q

switchport trunk encapsulation dot1q

switchport mode trunk

Only controlled Vlans allowed on the trunk. All of the trunk port Gig Ethernet.

[paddyxdoyle]

Hi,

What models are your 8 switches?

Thanks

PD

[Kumar Krishnamurthy]

Hi,

All the switches are 3550 running Layer 2.

Due to security & other reasons CDP has been disabled in all of the 8 switches.

regds

krk