With IPHost Network Monitor you can run simple snmp requests against a Cisco device in your network.
cseL2ForwardedLocalOctets
CISCO SWITCH ENGINE L2 Forwarded Local Octets
1.3.6.1.4.1.9.9.97.1.1.1.1.2
Number of octets in the packets received from ports local to this switching engine and forwarded at layer 2.
Back to CISCO-SWITCH-ENGINE-MIB MIB page.
IPHost Network monitor allows you to monitor cseL2ForwardedLocalOctets on Cisco device via the SNMP protocol. Download IPHost Network Monitor (500 monitors for 30 days, 50 monitors free forever) to start monitoring Cisco routers right now.