Hello,
Can
uplinkfast be configure in one switch that has 2 uplinkt to another
switch (root) or for uplinkfast to work the uplinks have to be
connected to two different switches? I have only two switches in my
home-lab and I am trying to see how it works but connecting two linkst
between the two switches it still goes trough forward delat times even
though uplinkfast is enabled.
Please help me get this clear.
Hi,
The UplinkFast feature is based on the definition of an uplink group. On a given switch, the uplink group consists in the root port and all the ports that provide an alternate connection to the root bridge. If the root port fails, which means if the primary uplink fails, a port with next lowest cost from the uplink group is selected to immediately replace it.
The UplinkFast feature dramatically decreases the convergence time of the STP in the event of the failure of an uplink on an access switch. UplinkFast interacts with other switches that have a strict standard STP. UplinkFast is only effective when the configured switch has some non-self-looped blocked ports. In order to increase the chances to have blocked ports, the port cost and bridge priority of the switch are modified. This tuning is consistent for an access switch, but is not useful on a core switch.
UplinkFast only reacts to direct link failure. A port on the access switch must physically go down in order to trigger the feature
Hope to Help !!
Ganesh.H
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