Well, at the Bay/Nortel acclear class I went to they
stated that spanning tree didn't care about VLANs and
BPDUs, etc effected all VLANs. This is 802.1q. Also,
the acclear supports multiple spanning tree groups
(STGs) per VLAN by putting propiertary header on
spanning tree packets for other STGs. Default spanning
tree group (1) is normal. I haven't ran into anyone
using multiple-STGs however and haven't looked into
this in much detail (trace, etc) yet.
--- Andy Harding <[EMAIL PROTECTED]>
wrote:
> have been having (semi) argument at work about dot1q
> versus ISL
>
> my understanding is that dot 1q runs one instance of
> spanning tree per trunk, rather than per vlan as ISL
> does - hence if one VLAN is blocking then dot1q
> disables the entire trunk
>
> A collegue of mine reckons that dot 1q now does as
> per ISL and runs STP on a per-vlan basis, but the
> 802.1q spec has changed without the # changing
>
> someone help me out here...
>
> thanks
>
> Andy
>
>
>
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