You are correct. That only applies to the 6148. Originally it also
applied to the 6548 as well, but that limitation was removed later by
s/w optimizations in the LTL programming scheme. So you *can* get
more than 1G thru an etherchannel with 6548s, but of course, you
still can only get 1G max thru a given port group on the card.
All the other restrictions of the 6148 (eg, no jumbos) still apply to 6548.
HTH,
Tim
At 09:46 AM 6/12/2009, Michael Ulitskiy muttered:
On Friday 12 June 2009 11:34:14 am Pete Templin wrote:
> Geoffrey Pendery wrote:
>
> > I have a question of my own, since this subject has come up a time or
> > two - regarding the 6148's, the statement is made a couple times
> > that Etherchannel will get you port redundancy but no extra
> > bandwidth, since the ASIC is only a gig. But if I distribute my
> > channel across two slots, say Gig 1/1 and Gig 2/1, does that get me
> > around the gig limit? Or even Gig 1/1 and Gig 1/48, since it's
> > separate ASICs? Logic tells me yes, but I've heard the "1 gig limit"
> > mentioned as if it's a hard platform limitation, not just a result of
> > a particular bottleneck. My instinctive behavior with channels is to
> > span them across blades anyway, to guard against blade failure....
>
> My understanding (since my google-fu won't find a quickie answer at the
> moment) is that 6148s copy any EtherChannel frames to every ASIC on the
> card, so you can get to 2G by spreading over two cards, but you're still
> limited to 1G no matter no many controllers you cover within a 6148. :(
>
> We've updated the banners on all relevant 6148-loaded chassis to remind
> folks to never build EtherChannels on those cards. Oh well...
My understanding was that every EtherChannel frame is delivered (by
Sup) to every
ASIC involved (has a port) in EtherChannel regardless of which card it is on.
So you can't get more than 1G even if you distribute your
EtherChannel over several cards.
Am I wrong?
Michael
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Tim Stevenson, [email protected]
Routing & Switching CCIE #5561
Technical Marketing Engineer, Cisco Nexus 7000
Cisco - http://www.cisco.com
IP Phone: 408-526-6759
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