Running VLANS over Port Agg

[Pyers Symon]

Had a ideas session the other day and one of the things that was discussed for a particular environment we have is to run VLANS over Port Aggregation (we need both!). We were told that "HP don't support this" and "Nobody has asked for this before" (the latter I doubt!) Anybody any idea what is the current state-of-play concerning this?

[Xianjie Zhang]

Which OS version do you refer to?

[Alzhy · Accepted solution]

Yes.

VLANS are supported on port aggregates (APA).. Same syntax, after you build your aggregate ie lan900:

ifconfig lan900:1 up

...
etc.

[Pyers Symon]

11.11 as it happens...... Thanks for the replys. I suspected that there was a certain amount of how could I say "inexpert knowledge" here !

[Jim Keeble]

I think there could be some confusion over the term "VLAN" .

The virtual or "alias" IP's described by the interface name syntax lan900:X is supported by APA. This allows you to use multple IP addresses on your link aggregate, but they are all part of the same VLAN, ie., the same ethernet broadcast domain.

The VLAN function that is not supported is that of "tagged" VLANs, where there are multiple broadcast domains on the same physical port. It uses the 802.1q specification, inserting a "shim" with the VLAN tag into the ethernet header. I believe Cisco refers to this as "trunking".

If tagged VLANs are what you mean, why not be the first "somebody" to ask for it ?

:-)

[Pyers Symon]

As we use Cisco switches we are probably looking at tagged (also multiple broadcast addresses were mentioned) . To be honest this came up as a discussion point rather than a firm proposal and was not taken further following the statement that it wasn't supported. It looks as if I have slurred the integrity of certain people! Sorry guys!

[Xianjie Zhang]

Currently, VLAN over link aggregation is NOT supported in 11i v1 (11.11). It is not supported on 11i v2 (11.23) either, but, there is a very good chance it WILL be supported on 11i v2 (11.23) in the future.