04-08-2016 11:24 PM - edited 03-08-2019 05:17 AM
04-09-2016 03:09 PM
According to your diagram and description you are trying to establish VSS between a 4500x and 4506E. This is not possible, as for VSS to work the platforms need to be the same. 2 4500x or 2 4506E.
HTH
04-09-2016 08:57 PM
no,i have two vss pair
4506E vss and 4500-X vss
i have connecting them with MEC,now we need adding two 10G link into this MEC.
after adding the fourth link the port-channel stop work. but no errors in the system message
04-10-2016 09:53 AM
Hi Hou -
This is the problem with an unconditional EtherChannel (mode on). There will be no errors to troubleshoot and any misconfiguration on either side will result in traffic drop.
Since you have uptime requirements, I suggest that you reduce your connections between your 2 VSS pairs to 1, then build a brand new LACP EtherChannel. This will result in a STP controlled dual-link between the switches. To ensure that you do not get unintended forwarding across the new PortChannel (EtherChannel) while you are building it, make sure that the STP cost for the single link will always be lower than the PC (you will likely need the STP path cost method set to long). When you are ready, turn off the single link and STP will move all traffic over to the PC.
PSC
04-10-2016 07:46 PM
thank you i will try this next maintenance windows
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