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RSTP convergence time

What is the default convergence times when using RSTP? Unlike STP I understand that RSTP has three timing intervals before it begans to converge.

RSTP

Hello timer >>> 2 seconds

MAX-AGE >>> 6 seconds

Forward-Delay (Learning) >>> ? seconds

Default convergence time ?

STP

Hello timer >>> 2 seconds

MAX-AGE >>> 20 seconds

Forward-Delay (Listening) >>> 15 seconds

Forward-Delay (Learning) >>> 15 seconds

Default convergence time 50 seconds

If I am understanding things correctly

1. The Hello interval are the same as STP which is every 2 seconds.

2. The default Max-Age time for RSTP is 3 times the hello interval or 6 seconds.

3.RSTP elminates the listening state however, there is a learning state.

What is the default time that RSTP stays in the learning state before is transitions to either forwarding or discarding?

I can't seem to find this information.

  • LAN Switching and Routing
1 REPLY

Re: RSTP convergence time

Same value as for STP. But in the case of RSTP, those timers are only used as a fallback mechanism, if the proposal agreement mechanism (which does not depend on *any* timer) cannot work for some reason (neighbor not running RSTP, shared segment etc...)

Regards,

Francois

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