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Author Topic: Spanning tree question  (Read 4580 times)

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Offline leduke

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Spanning tree question
« on: August 28, 2013, 10:42:19 AM »
Hello.

I have to loop 3 Nortel Ethernet switchs connected to each other by SFP Fibre module.

The target is to keep network communication between the hole network when a fibre link is down.

I actualy use the default spanning tree mode: Nortel Stpg. When one link is down, I lost about 20 pings.

Is there any better configuration to do this, and lost less ping with a network failure ?

Thank you


Offline Telair

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Re: Spanning tree question
« Reply #1 on: August 28, 2013, 01:15:20 PM »
Hi there leduke and welcome.  Nortel STG is regular old spanning tree with it's slow learning ( up to 50 seconds! ) and blocking.  Maybe try switching to using RSTP, or rapid spanning tree.  That will typically give you failover times of a second or two if you have the switches configured in a loop.  MST is the latest spanning tree protocol out there which is useful when you have a whole bunch of VLAN's and want to running spanning tree at the VLAN level and not at the port level.

Offline leduke

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Re: Spanning tree question
« Reply #2 on: August 29, 2013, 03:47:43 AM »
Hello.

Thank you. I will use RSTP. But RSTP needs more configuration isn't it ? Must I configure root ports ? Or leave the default configuration ?

Thank you

Offline Telair

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Re: Spanning tree question
« Reply #3 on: August 29, 2013, 03:50:04 PM »
Nope.  You just have to change your switch to RSTP mode, reboot and then you can fine-tune your settings if you want.  But I tend to leave those alone at their defaults.  I just turn off spanning tree on MLT/LAG ports is all.

Offline leduke

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Re: Spanning tree question
« Reply #4 on: August 30, 2013, 02:20:11 AM »
Thank you so much !

I just tryed, no network diturbance when disconnect et reconnect one uplink, exepted on the root port.

Thanks