[c-nsp] ME3400 FHRP - GLBP with IPv4 and IPv6

[Lukas Tribus]

Hi,

> Just FYI - we've got the answer from TAC now that the ME3400G won't
> support an FHRP with IPv4 and IPv6 on the *same interface*. It seems to
> be a hardware limitation of this series.

Does this apply only to ME3400 non-E, or to the E series as well?

ME3400 non-E is EOL and EOS next month (that could be standard excuse nr1):
http://www.cisco.com/en/US/prod/collateral/switches/ps6568/ps6580/end_of_life_notice_c51-726108.html



> Call my imagination somewhat limited, but I have a truly hard time
> understanding how you could build a hardware that would not be able
> to do that. This is basically a pure control-plane functionality,
> plus "handle a virtual MAC address" - and if you use the same vmac for
> IPv4+IPv6, I can't see how the forwarding hardware would need to know
> that there is IPv6 involved as well.

Agreed, just punt the packet to the CPU, its not like using one destination
mac with multiple applications would be a first: 01:00:0c:cc:cc:cc is used for
CDP/VTP/DTP/PAGP/UDLD - and that even includes parsing an LLC header to
differentiate the application; here we just need to differentiate based on the
EtherType.


Probably the "business case" is not big enough to fix this bug, and declaring
a WONTFIX for such a severe IPv6 limitation in 2013 would not be very wise
from a PR perspective, so they made up the hardware excuse.



great!

lukas