[mrtg] Re: cammer.pl for bay/nortel kit?

Rich Adamson radamson at routers.com
Tue Jun 24 14:40:18 MEST 2003

> I have three questions:
> 1. What is the "com at vlan hack" and is it Cisco-specific?

Yes it is Cisco-specific. In your example, "com" is the snmp community
string programmed into the switch. The "vlan hack" is suppose to represent
the vlan number (or name) for which you want to pull certain mib variables.

> 2. Despite what the comment says, the code still passes a community 
>    string of community_string at vlan - er, help! ;-)
> 3. I suspect that Nortel/Bay do not support this "feature" - if anyone 
>    knows more about this please share it!

Cisco's hack allows one to get selected vlan-related information on a
per-vlan basis, such as "which device mac addresses are associated with 
vlan 5" as one example. Cisco used this approach only on selected switches.

The approach is very much non-standard, however if one studies the exact
data retreival problem they attempted to address, there are no defined MIB
standards that could have been used. The hack only applies to certain
mib variables and is not needed for most mrtg uses, etc. Most other 
vendors made no attempt to address the snmp issue at all.

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