SNMP : redundant MIP variables

[hwanjoheo]

I found that there are redundant variables in Catalyst 4507 series;

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"cieIfInputQueueDrops" "1.3.6.1.4.1.9.9.276.1.1.1.1.10"

"cieIfOutputQueueDrops" "1.3.6.1.4.1.9.9.276.1.1.1.1.11"

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"locIfInputQueueDrops" "1.3.6.1.4.1.9.2.2.1.1.26"

"locIfOutputQueueDrops" "1.3.6.1.4.1.9.2.2.1.1.27"

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The descriptions of them look identical; a counter of

queue drops.

When I query them with snmpwalk;

$ snmpwalk -v 2c -c public 128.210.254.180 1.3.6.1.4.1.9.9.276.1.1.1.1.10

SNMPv2-SMI::enterprises.9.9.276.1.1.1.1.10.1 = Counter32: 0

SNMPv2-SMI::enterprises.9.9.276.1.1.1.1.10.2 = Counter32: 0

..........

SNMPv2-SMI::enterprises.9.9.276.1.1.1.1.10.35 = Counter32: 0

$ snmpwalk -v 2c -c public 128.210.254.180 1.3.6.1.4.1.9.2.2.1.1.26

SNMPv2-SMI::enterprises.9.2.2.1.1.26.1 = INTEGER: 0

SNMPv2-SMI::enterprises.9.2.2.1.1.26.2 = INTEGER: 0

...............

SNMPv2-SMI::enterprises.9.2.2.1.1.26.35 = INTEGER: 0

As seen above, the switch replies both well. Are they

actually same counters?

And one more question, how can I verify that these counters are enabled and properly operating? If you know, please let me know some commands that may help.

Thank you!

[umedryk]

I don't see what you are saying. Counter can only be incremented and cannot be decrememted. Counter will reach zero after it goes to a max count.

[bjellig]

"1.3.6.1.4.1.9.2.2" is the "OLD-CISCO-INTERFACES-MIB".

"1.3.6.1.4.1.9.9.276." is the "CISCO-IF-EXTENSION-MIB".

The second MIB replaces the first. Some software images support both MIBs so that your monitoring equipment doesn't immediately break when you update your IOS. If both are available in your system, they should return the exact same results.

As for testing this particular counter, you'd need to push a high volume of traffic over the interface(s) polled to saturate the queues and force drops.

You can use the Cisco SNMP object navigator to find out more information about specific OIDs:

http://tools.cisco.com/Support/SNMP/do/BrowseOID.do?local=en