Re: MST error

Hi Raheel!

Cisco implemented 802.1s (Multiple Spanning Tree Protocol) in two
phases/versions. A "pre-standard" version they called MISTP, and a
standard version they now term 802.1s (MST). Here, it appears you are
connecting a pre-standard version IOS to a standard version device.
According to the documentation in the link below: "When you connect
the prestandard MST switch with the standard MST switch, you need to
configure spanning-tree mst pre-standard in the interface of the
standard MST switch"

http://www.cisco.com/en/US/products/hw/switches/ps708/products_configuration_example09186a00807b075f.shtml

Warmest Regards,

Anthony J. Sequeira, CCIE #15626
http://www.INE.com

Test your Core Knowledge today!
Q: Routing protocol updates are sourced from what address in IPv6
networks?
A: link local
More Info: http://www.cisco.com/en/US/docs/ios/ipv6/configuration/guide/ip6-ospf.html#wp1069821

On Aug 24, 2009, at 12:42 PM, Raheel Muhammad wrote:

> Dear All,
>
> Might be a basic question but could not figure out, please explain
> what is
> this error.
>
> *Mar 1 02:31:20.391: %SPANTREE-3-PRESTD_NEIGH: pre-standard MST
> interaction
> not configured (Port-channel2). Please, configure: 'spanning-tree mst
> pre-standard' on ports connected to MST pre-standard switches.
>
> Regards,
> Raheel
>
>
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Received on Mon Aug 24 2009 - 12:56:28 ART