03-09-2015 01:19 AM - edited 03-07-2019 11:00 PM
Hi,
we want to use physical layer 3 interfaces with subinterfaces on several links between Cat6K Sup2T, Cat6880, Cat45K Sup7/8, Nexus7K Sup2, Nexus5624Q platforms.
Does anybody know where I can find information if these platforms support subinterfaces with current ios versions?
When I further use subinterfaces with VLAN tagging, can I use the same VLAN Tag on different physical l3 interfaces?
Best Regards
Thorsten
03-09-2015 03:43 AM
Hello Thorsten,
I've worked on all the listed platforms, apart from the C6880 (though I think it should be more or less the same), and can be quietly confident to say that they do support the sub-interfaces with vlan tagging.
You can use the same vlan tag on a different sub-interface, I do not see that as being a problem.
The cisco feature navigator is available for you to use, to lookup specific technologies, and find out which hardware platform, with which image supports it.
Hope this helps
Bilal
03-09-2015 03:55 AM
Hi Bilal,
many thanks for your reply, your experience of subinterfaces sounds very well to me ;-)
Use of the same vlan tag on different sub-interfaces of the same physical interface shouldn't work in my eyes because the vlan tag is the only way to distinguish the trafffic on the physical link, correct?
I already had a look at the feature navigator but I didn't find the correct keyword. Just searching for subinterface didn't help because there are only special subinterface features listet but not the general support of subinterfaces.
03-09-2015 04:32 AM
Hi Thorsten, you can use the vlan tag on multiple sub-interfaces that reside on the same physical interface. As an example you may not want to distinguish traffic, there might have been a reason to use another subnet address or make use of vrf on the sub-interfaces to "join / merge" two environments together via some sort of switch / service provider.
Edit: If you were doing point-to-point connections, i.e. routerA to routerB that is under the same AS, I can't think of a purpose to have them use the same vlan tag on multiple sub interfaces that reside on the same physical interface. (though - I have never tried it before to see what would happen)
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