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Rapid Spanning-tree and Spanning-tree Backbone fast

serge.carpentier
Beginner
Beginner

Dear all,

I've question, it's possible active rapid spanning-tree and spanning-tree backbonne-fast on the same switch ?

Best Regard

Serge

1 Accepted Solution

Accepted Solutions

Giuseppe Larosa
Hall of Fame
Hall of Fame

Hello Serge,

the answer is that Rapid STP includes the equivalent of backbone fast in its behaviour.

The backbone fast convergence optimization is built in in Rapid STP so you don't need to enable it.

With Rapid STP is very important to define the user facing ports using spanning-tree portfast. This helps to improve convergence by limiting the ports on which a synchronization wave is propagated.

Hope to help

Giuseppe

View solution in original post

2 Replies 2

Giuseppe Larosa
Hall of Fame
Hall of Fame

Hello Serge,

the answer is that Rapid STP includes the equivalent of backbone fast in its behaviour.

The backbone fast convergence optimization is built in in Rapid STP so you don't need to enable it.

With Rapid STP is very important to define the user facing ports using spanning-tree portfast. This helps to improve convergence by limiting the ports on which a synchronization wave is propagated.

Hope to help

Giuseppe

Thank You Guiseppe,

I actived to show the result on the switch and you're right.

Here is the result :

Switch is in rapid-pvst mode

Root bridge for: VLAN0001

Extended system ID           is enabled

Portfast Default             is disabled

PortFast BPDU Guard Default  is disabled

Portfast BPDU Filter Default is disabled

Loopguard Default            is disabled

EtherChannel misconfig guard is enabled

UplinkFast                   is disabled

BackboneFast                 is enabled but inactive in rapid-pvst mode

Best Regard

Serge

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