Hello,
I would like to know if there is anyway to configure a cat6500 in native IOS 12.SX (12.2.17SXb1) to generate syslog message or SNMP trap when a spanning-tree Topology Change Notification is received.
-
The current way we use to check it is manually via:
- CLI command " sh spanning vlan X det" outputs
- snmget OID dot1dStp.3.0 (for vlan1)
--
Better way should be to receive automatically a snmp trap or syslog message when TCN is received.
--
I have configured rmon alarm and event in order to generate snmp trap:
"
rmon event 1 log trap public description TCN owner ludo
rmon alarm 1 dot1dStp.3.0 5 absolute rising-threshold 1000 1 falling-threshold 5000 1 owner ludo
"
I can see that rmon even is fired when TCN is received:
"
CAT4#sh rmon alarms
Alarm 1 is active, owned by ludo
Monitors dot1dStp.3.0 every 5 second(s)
Taking absolute samples, last value was 159800
Rising threshold is 1000, assigned to event 1
Falling threshold is 5000, assigned to event 1
On startup enable rising or falling alarm
CAT4#sh rmon ev
CAT4#sh rmon events
Event 1 is active, owned by ludo
Description is TCN
Event firing causes log and trap to community public,
last event fired at 0y3w3d,02:30:34,
Current uptime 0y3w3d,02:57:02
Current log entries:
index uptime description
1 0y3w3d,02:26:38 TCN
2 0y3w3d,02:26:49 TCN
3 0y3w3d,02:28:29 TCN
4 0y3w3d,02:28:39 TCN
5 0y3w3d,02:30:24 TCN
6 0y3w3d,02:30:34 TCN
CAT4#
"
--
But it seems that SNMP trap is still not generated even if needed SNMP configuration is present:
"
snmp-server community public RO
snmp-server enable traps bridge
snmp-server host 9.x.x.152 public
"
No snmp traps seen in sniffer traces taken on snmp trap receiver side.
Could anyone help me to find out a solution that works?
Thanks. Regards/Ludovic.
