broadcast/multicast counters does not increase on vlan interface

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Nov 12th, 2009
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on a Cat6500 we try to monitor interface packet statistics via snmp, in detail we want to get information about the relation between unicast, multicast and broadcast packet counter.

What we found out is that while on physical l2 interfaces all counters (ifHCInUcastPkts, ifHCInMulticastPkts, fHCInBroadcastPkts, ifHCOutUcastPkts, ifHCOutMulticastPkts, ifHCOutBroadcastPkts) are filled, on vlan interfaces multicast in/out and broadcast out packets stay zero whole the time. We use arp, hsrp, ospf and other well know broadcast and multicast based protocols.

Does anybody know why this counters do not increase?

Attached you find an excel sheet which shows an example of interface counter vs. vlan counter.

many thanks in advance,

Thorsten Steffen

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