I have met real situation in our network, when Cisco 3560 MAC table became full (6 K addresses). It was not due to MAC flooding , but due to increasing network flow patterns. To solve the problem I have just changed sdm profile from default to vlan. Right Now Cisco 3560 allow 12 K MAC, average MAC address count in MAC table is about 8K. So everything is O'k.
But right now I am thinking, how to get notification about exceeding MAC Threshold to SNMP Network Monitoring System from Cisco 3560.
In documentation I have only found how to send SNMP trap about learning/clearing MAC on specific ports.It not my case.
Using Cisco SNMP Navigator I have searched through CISCO-MAC-NOTIFICATION-MIB. Where are some MIB related to my problem.
But this solution is not effective, If I would like simple to read active MAC address count in MAC table
I will solve my problem in following way. Just write simple tcl/expect or perl script. Script will telnet to devices and read show mac-address-table | inc Total output. If value is more than let say 5K active MAC addresses, rise the alarm window.
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