We have a pair of 6509 w/SUP720-3BXL switches running HSRP and are connected via trunk using the sup 1G interfaces. We did not create a channel-group, just direct connected. We're now starting to realize this interface is not enough bandwidth and want to leverage some of the 10G interfaces.
My thinking was to create a channel-group and put at least one 10G interface on each switch into the group, but how can I force the switches to use the 10G over the 1G?
If you have two separate paths between the 6500s then STP will have to block one of them because you have created a L2 loop. So it should block the 1Gbps path because the cost of 1Gbps is 4 and the cost of 10Gbps is 2.
So it should take the 10Gbps link. Be aware that because STP has to block the existing 1Gbps path you will see a shot outage while it reconverges so you should scehdule an outage to do this.
In addition to what Jon noted (hi Jon, welcome back) you also need to make sure your HSRP active is aliened with your root bridge. So, if you are planning to add the10Gig portchannel, you want to add it to the forwarding link first before you bring up the portchannel on the blocking link, so your STP topology stays the same.
We are pleased to announce availability of Beta software for 16.6.3. 16.6.3 will be the second rebuild on the 16.6 release train targeted towards Catalyst 9500/9400/9300/3850/3650 switching platforms. We are looking for early feedback from custome...