IOS – tkrn's blog

Cisco MAC Address Flapping Causing High CPU Utilization

Posted on October 18, 2011by tkrnLeave a comment

A MAC flap is caused when a switch receives packets from two different physical/logical interfaces with the same source MAC address. The switch then learns where the MAC address is and puts in to a table. This table has the physical/logical interface and the MAC address. When flapping occurs it causes this table to be […]

SNMP v3 + Cisco IOS Crash Course

Posted on August 17, 2011by tkrnLeave a comment

SNMPv3 allows for authentication and encryption (AES, DES, 3-DES) for managing core routers and switches. CiscoWorks LAN Manager Solution (LMS) requires SNMPv3 to be enabled and setup correctly for doing port VLAN tagging and a various other features through the LMS web interface. Here is a simple crash course on setting up SNMPv3 on an […]