It's very easy to bring down a network when configuring "channel-mode on". If we do it first on the root switch, the spanning-tree loop is already there. Someone that wrote about this and explains some scenarios:
http://www.dasblinkenlichten.com/?p=684 "channel-mode on" is very bad and dangerous. I don't understand why some design guides still have this... Regards, Antonio Soares, CCIE #18473 (R&S/SP) amsoa...@netcabo.pt http://www.ccie18473.net -----Original Message----- From: cisco-nsp-boun...@puck.nether.net [mailto:cisco-nsp-boun...@puck.nether.net] On Behalf Of Gert Doering Sent: sábado, 16 de Março de 2013 18:37 To: Joseph Hardeman Cc: cisco-nsp Subject: Re: [c-nsp] VSS to vPC - vPC to Etherchannel Hi, On Sat, Mar 16, 2013 at 11:28:42AM -0400, Joseph Hardeman wrote: > No actually they are configured as "mode on" no LACP. I spoke with a > CCIE a couple of years ago and he told me that use mode on from switch > to switch and lacp from switch to server so thats what I am putting in. That was years ago, and is not good advice today. Propably wasn't good advice then, but that depends on "how many years ago"... With LACP you'll *know* that both ports belong to the same channel on the other side, and both are ready to be used, not "uh, link up, but line card crashed" or "this is a multichannel LAG, and one of the chassis' is just booting and not really participating yet", or such. gert -- USENET is *not* the non-clickable part of WWW! //www.muc.de/~gert/ Gert Doering - Munich, Germany g...@greenie.muc.de fax: +49-89-35655025 g...@net.informatik.tu-muenchen.de _______________________________________________ cisco-nsp mailing list cisco-nsp@puck.nether.net https://puck.nether.net/mailman/listinfo/cisco-nsp archive at http://puck.nether.net/pipermail/cisco-nsp/