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Webcast-Catalyst9k
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default spanning tree mode??

What is the default spanning-tree mode on a 4507 swith with IOS version 12.1 and later.

Is it PVST+ ?

The reason for the above stated question is that for the same category of switches with IOS version of 12.2 and above, when we run the "sh run" command, we can see the type of spanning tree mode that is running. ie it shows in the runn config that "spanning tree mode is pvst"

But for the 4507 with an IOS version of 12.1(20)EW1, the "sh run" command does not show us the type of spanning-mode that is being run. We need to run the "sh spanning-tree summary" to see the mode.

The PVST mode is being run on the above stated switch.

Hoping to get a resolution for the same at the earliest.

Thanks,

Sonali

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Re: default spanning tree mode??

Catalyst 4000 family switches use STP (the IEEE 802.1D bridge protocol) on all VLANs. By default, a single spanning tree runs on each configured VLAN (provided you do not manually disable the spanning tree). You can enable and disable a spanning tree on a per-VLAN basis.

http://www.cisco.com/en/US/products/hw/switches/ps663/products_configuration_guide_chapter09186a00800ddbc9.html

And here you can found that the default mode is PVST+

http://www.cisco.com/en/US/products/hw/switches/ps4324/products_command_reference_chapter09186a00801d034c.html#wp1055820

(search for spanning-tree mode)

bye

FCS

Rate me if I helped.

Re: default spanning tree mode??

Hi Sonali,

The default mode is PVST+. On some IOS it will show you only PVST, RPVST+ and MST. But the PVST mode as bulit in PVST+ capability and it works the same way.

HTH, Please rate if it does.

-amit singh

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