06-26-2009 04:51 AM - edited 03-06-2019 06:28 AM
Hi there
If I had 2 distribution switches, then an access layer switch dual homed to both dist switches, running STP, But if I effectivley turned off STP on the link between the dist switches, what would happen on the access switch ? would it still work and block as per normal ?
06-26-2009 06:03 AM
Hello Carl,
>> But if I effectivley turned off STP on the link between the dist switches,
do it only if between the two distribution switches there is a L3 path otherwise you are in trouble.
Hope to help
Giuseppe
06-26-2009 06:09 AM
You would then likely not have anything blocking on the access layer as you have eliminated the inherent loop in the network.No different than say having 2 uplinks and then a routed crosslink .
06-26-2009 06:34 AM
hi there
thanks for that, one more question, can you still use HSRP on the dist routers for the access layer clients if there is a layer 3 link between them ?
06-26-2009 07:24 AM
Sure , not a problem .
06-29-2009 03:02 AM
Hi Glen
Does this mean that all the hsrp traffic will be flowing through the access to dist uplinks?
06-29-2009 05:00 AM
Correct - you need a layer 2 link between the two SVIs participating in HSRP, so the HSRP hellos would be flowing through the access switch to maintain adjacency.
I have never deployed this type of design, we tend to stick with the traditional looped topology between access and distribution, using Rapid-PVST+ to maintain a loop free topology.
If you have many access switches using the same Vlan you may start to complicate design / troubleshooting by removing the layer 2 link between the distribution switches.
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