[nsp] Messuring input queue drops via SNMP, and MAC/IP lenght inconsistencies

Sam Stickland sam_ml at spacething.org
Thu Aug 14 22:40:33 EDT 2003


I'm getting some input queue drops on a couple of my VLANs on a Cisco 6500.
I'm planning on graphing when they occur via MRTG, but I'm getting some
strange results out of SNMP.

sh int vlan 999


Input queue: 0/300/7346/0 (size/max/drops/flushes); Total output drops: 0

VLAN 999 has the interface number 65, occuring to

ifMIB.ifMIBObjects.ifXTable.ifXEntry.ifName.65 = Vl999

But when I attempt to query the number of dropped packets (ref:
= , I get:

enterprises. = 9198

Any idea why this figures would be different? On the other VLAN thats
getting dropped packets the console shows 632 drops, but SNMP gives 420835!

It's possibly unrelated, but I'll mentioned it here - I'm logging the
following messages at the rate of about one an hour:

%MLS_STAT-SP-4-IP_LEN_ERR: MAC/IP length inconsistencies

None of the ports in use are recording any errors, so it makes it hard to
track. I seem to remember reading somewhere before that someone else
experienced these problems on a 6500 and a change of IOS version fixed it.

This is with version 12.2(14)SY, on a Cat6506 with a WS-X6K-SUP2-2GE.


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