creating groups of VLAN - traffic disruption

I asked this question of TAC and got a vague response, so I was going to post here to see if someone had actually done this and what were their results.

We have a fairly basic config of UCS currently, there is a port on each fabric channel and our uplinks can take care of all our VLAN so all VLAN can use all uplinks.

We will soon add a new channel of port that will only serve the VLAN specific (trafifc for the external VCC of our Nexus 7 k). So we will now have a disjoint network layer 2, where VLAN 1xx require port-channel 1 and VLAN 4xx can only use the port-channel 2.

I have read all Cisco docs and it seems rather simple to deal with groups VLAN so that we make sure VLANS only try to use correct rising/port-channel binding, however our concern is moving all our VLAN existing in a group VLAN and the final outcome of this. I ran this by TAC and they said that there could be a "brief traffic disruption" when we apply this config.

It gives me some anxiety b/c we are talking about all our ESXi hosts and each VM on these hosts (500 +). However it may be brief, that could be a problem if all of a sudden everything is unable to speak.

Someone had an existing config that they moved to a configuration group VLAN and what has been your experience? It disrupt all traffic?

We have not added the new port-channel, so everything we do now is entering a group of our existing VLANs and by assigning them to the existing port-channel.

Any comments or thoughts would be appreciated

We did just that. We moved in four areas separated into four groups of clan. We have created our groups and then all the VLAN for this corresponding uplink at the same time. We didn't see any packet loss or impact to end users.

We have a facility of similar size. About 20 blades, ESXi server and windows, behind the pair of FIs. About 400 machines behind that. The movement is quick and easy.

Previously, we were using the uplink of LAN Manager. I found it a bit heavy. Clan group works much easier in my opinion.

Plan a window of maintenance, to be careful, but my experience of 25 VLAN moving through four interfaces different disjoint layer 2, we have not had any problems.

Tags: Cisco DataCenter

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