I have a circular network loop using MST. The switches are connected via dual gigabit fiber in an etherchannel bundle.
I had to re-run fiber connecting 2 of the switches, so I shut down the port-channel interface between them. Now that I have all of the cabling back in place, will there be any interruption of service when I re-enable the etherchannel link?
I understand that MST touts speed as one of its key selling points, but this is an extremely high availability environment and even a few seconds of downtime could be catastrophic.
In my mind, it shouldn't be any different than how MST would operate if a cable were to be removed from a switch, which is something I've tested and worked perfectly. I just can't afford any gotchas here. UDLD is enabled on both switches; aside from that all relevant information should be below.
In short, here is a simple diagram.
The port channel interface between switch A and D is administratively shut down. When I re-enable it, will it disrupt any traffic?
All in all it seems like a no brainer, but I'd rather someone with more MST experience comment on this. I've goofed before by adding a VLAN and causing an instance recalculation (outage!) and would rather not have to explain something like that again.
It's not an editing error; I just haven't had a downtime window to add VLAN 50 to the rest of my switches. It hasn't been a problem with any of my other switches in the loop, so I'm assuming having the same instance name will suffice.
as far as I know it is not enough because the MST BPDU contains a special hash calculated using the vlan to instances mapping.
if the hash values don't match the switches think they are in different MST region.
You have two MST regions already.
MST-enabled switches only form an MST region if they have a matching VLAN-to-IST mapping, MST configuration name, and MST revision. If any of these three fails, the port will be flagged as a boundary port.
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