11-03-2009 04:03 PM - edited 03-06-2019 08:25 AM
We are going to move to VSS, and some of the blade servers we have don't support VBS, so I can run MEC to the switches. I would like to use switch ports in the BACKUP config.
Router(config-if)# switchport backup interface fastethernet 4/1
With changes VSS does to STP, can the BACKUP command still be used?
11-06-2009 12:30 AM
Hello Cody,
multi chassis etherchannel should be the best choice for connecting to a VSS because it allows to use both links.
with the backup option it is like connecting to two standalone chassis.
in a recent thread about VSS advantages several colleagues have pointed out that with VSS you can use both uplinks doubling the BW.
Hope to help
Giuseppe
11-23-2009 02:27 PM
the issue is the Blade switches can't stack, so I need to prevent a STP loop. So I figured the backup port would be the best option.
11-23-2009 03:08 PM
Hello Cody,
but your blade switches are interconnected between themselves or only with VSS?
in latter case you should be able to setup an etherchannel for each blade to VSS without any problem also in case one of the two chassis in the VSS pair fails.
in my understanding MEC is multi-chassis on the VSS side.
see
VSS based campus design:
https://www.cisco.com/en/US/docs/solutions/Enterprise/Campus/VSS30dg/VSS-dg_ch3.html
https://www.cisco.com/en/US/docs/solutions/Enterprise/Campus/VSS30dg/campusVSS_DG.html
if the blades are interconnected between them this requires some attention.
Hope to help
Giuseppe
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