SNMP oid converrsion for clagAggPortListPorts

[b0mylesjr]

I'm trying to create an snmpwalk to determine the ports in a port-channel interface.  i run the oid "1.3.6.1.4.1.9.9.225.1.4.1.1.1" and get something like this:

nSNMPv2-SMI::enterprises.9.9.225.1.4.1.1.1.369098851 = Hex-STRING: 00 02 02 34 03 34
nSNMPv2-SMI::enterprises.9.9.225.1.4.1.1.1.369098901 = Hex-STRING: 00 02 02 01 03 01
nSNMPv2-SMI::enterprises.9.9.225.1.4.1.1.1.369098952 = Hex-STRING: 00 02 00 01 01 01
nSNMPv2-SMI::enterprises.9.9.225.1.4.1.1.1.369098953 = Hex-STRING: 00 02 00 05 01 05
nSNMPv2-SMI::enterprises.9.9.225.1.4.1.1.1.369098954 = Hex-STRING: 00 02 00 09 01 09

I understand the first two sets of numbers are the number of ports in the port-channel.  What i want to know is how to translate the numbers afterward.  Is there a python script or another oid i need to engage?

[Rolf Fischer · Accepted solution]

I'm afraid this is quite complicated. You need some more OIDs to translate the indexes, calculate hex to decimal, do the mappings, etc...

Have a look at the OID description here:

https://snmp.cloudapps.cisco.com/Support/SNMP/do/BrowseOID.do?objectInput=clagAggPortListPorts&translate=Translate&submitValue=SUBMIT&submitClicked=true

You are correct: the first two octets indicate the number of ports bundled in the portchannel. The following octet pairs represent the list of ports belonging to the portchannel. I guess it's easier to understand by looking at an example:

Group  Port-channel  Protocol    Ports
------+-------------+-----------+-----------------------------------------------
3      Po3(SU)         LACP      Te1/2/12(P)    Te2/3/5(P)

clagAggPortListPorts.221 = "00 02 08 8C 11 05"

cieIfDot1dBaseMappingPort.28 = 2188 (0x088C)
cieIfDot1dBaseMappingPort.97 = 4357 (0x1105)

ifName.28 = Te1/2/12
ifName.97 = Te2/3/5
ifName.221 = Po3

Depending on the channel protocol(s) you use, there may be easier ways.

Example with LACP (OID dot3adAggPortAttachedAggID):

iso.2.840.10006.300.43.1.2.1.1.13.28 = 221
iso.2.840.10006.300.43.1.2.1.1.13.97 = 221

Hope that helps

Rolf