[mrtg] Re: cisco feature navigator and dot1q subinterface SNMP support

[Rich Adamson]

The ISL and DOT1Q vlan methods are very different and incompatible with
each other. As a network engineer, you choose which vlan method you want
to implement in your network based on interactions expected with other
network hardware (eg, routers, switches). The DOT1Q method is the oldest
standard and has been implemented by many different manufacturers. The
ISL method is newer and trys to address the shortcomings of the DOT1Q
method, however I'm thinking it is Cisco's implementation (not sure)
and is probably not supported by others.

Once you've made the network engineering decisions as to which method is
most appropriate for your network, then use the snmp variables that are
supported by that method.  Highly unlikely that you will engineer the
network based on the one with the most snmp vlan variables.


> I am trying to find the best IOS image for my new router.
> In Cisco Feature Navigator (http://www.cisco.com/go/fn) there are two
> features called:
> 
> "SNMP Support for IOS vLAN Subinterfaces" and
> "SNMP Support for vLAN (ISL, DOT1Q) Subinterfaces"
> 
> Looks the same to me, but the description is somewhat different:
> 
> "SNMP Support for VLAN Subinterfaces feature provides mib-2 interfaces
> sparse table support for Fast Ethernet subinterfaces" and
> "SNMP support for IfTable for vLAN (ISL, DOT1Q) subinterfaces" respectively.
> 
> Does anybody know which one is needed for MRTG graphing bandwidth on
> individual VLAN subinterfaces?


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