Rmon

RMON and MIB

RMON is generally an easy task, can be tricky but usually on CCIE workbooks the task are fair. The hardest part for me is to find the MIB to monitor. This is the task: monitor interface Vlan1, send a trap if it receives more than 100 packets every 30 seconds, send a trap if it goes under 50 packets every 30 seconds. First step: find Vlan1 ifindex. R#sh snmp mib ifmib ifindex Vlan99: Ifindex = 10 Virtual-Access2: Ifindex = 13 FastEthernet4: Ifindex = 5 FastEthernet0: Ifindex = 1 FastEthernet2: Ifindex = 3 Loopback0: Ifindex = 12 Null0: Ifindex = 6 Virtual-Access1: Ifindex = 11 <strong>Vlan1: Ifindex = 7</strong> Virtual-Template1: Ifindex = 9 NVI0: Ifindex = 8 FastEthernet1: Ifindex = 2 FastEthernet3: Ifindex = 4 So Vlan1 has ifIndex value 7.