Re: mst behaviour

Thanks cristian

Cheers !

On Fri, Jun 13, 2014 at 7:40 PM, Cristian Matei <cmatei_at_ine.com> wrote:

> Hi,
>
> With MST, the STP state of an interface is per MST instance, NOT per VLAN.
> When using MST and need to do VLAN filtering at the trunk level, you need
> to ensure the VLAN filtering matches the VLAN-to-MST instance allocation,
> otherwise you end up in such scenarios.
>
> Regards,
>
> Cristian Matei, 2 x CCIE #23684 (R&S/SC)
> cmatei_at_INE.com
>
> Internetwork Expert, Inc.
> http://www.INE.com <http://www.ine.com/>
>
>
>
> On 13 Jun 2014, at 16:54, Rakesh M <raaki.88_at_gmail.com> wrote:
>
> Hi,
>
> Two switches are connected in my network with back-to-back port-channels.
>
> port-channel 1 allows vlans 1-5 and port-channel 2 allows vlan 6 on both
> the switches.
>
> spanning-tree mode mst with instance 0 is configured globally.
>
> What i find is by default, switch 2 has blocked the port-channel 1
> interface for vlan 6.
>
> i am slightly confused with this behavior , is it not based on vlans
> per-interface , which should by default open Port-channel 1 for vlan 6 ?
>
> when i place it in different instance, it comes into forwarding state
> automatically
>
> Thanks
>
>
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Received on Fri Jun 13 2014 - 19:43:16 ART