Re: Multiple aggregated links between devices impossible?

On Nov 6, 2:23 pm, Glen Herrmannsfeldt <g...@xxxxxxxxxxxxxxxx> wrote:
chris wrote:
On Nov 3, 11:35 am, chris <googlegro...@xxxxxxxxxx> wrote:

(snip)

"IEEE 802.3ad specifies a method for vendor-interoperable link
aggregation under the following constraints:
<snip>

(snip)

Curiously, Cisco assures me that creating multiple LACP aggregations
between a pair of Cisco switches is a supported configuration.

"Vendor interoperable" means between devices from different vendors.

The standard doesn't say it will work between Cisco and any
other companies switch, nor does Cisco.

-- glen

Glen,

You snipped out the relevant part of the quote from Rich's book.
Vendor interoperable isn't important to me. I'm only using one
vendor.

The key phrase was "Only one multiple-link aggregation is supported"

So, Rich says I can only have one link per the standard, but Cisco
says I can have two standards-compliant links.

This still looks like a contradiction to me. Am I misunderstanding
something?

Perhaps you're arguing that many 802.3ad aggregations are permissible
between Cisco devices, but only one 802.3ad aggregation is possible if
the devices are from different vendors?

That doesn't make much sense to me. It seems to suggest that Cisco's
technique for bringing up multiple aggregations is NOT 802.3ad
compliant. Afterall, if something is standards-complaint, then vendor-
interoperability should be a foregone conclusion.

Thanks for your input. The discussion is pretty much academic at this
point because Cisco has blessed the configuration, but I still hope to
clear up my misunderstanding.

/chris
.

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