Hello,
I have done some research on this recently. We had an issue with the
Catalyst 4006, which currently does not support ISL trunking. What I found
is that Cisco has implemented PVST+ (Per VLAN Spanning Tree) extention
technologies within their newer switch platforms that allow 802.1q trunks to
do Spanning Tree per VLAN. This ofcourse is not a standard, this someting
Cisco has done within their products. I beleive the standards bodies are
working to allow the standard 802.1q to do STP per VLAN in the future.
In further discussions with the engineers at Cisco, they stated that
implementing 802.1q trunking today does not pose any issues.
Regards,
Thad Gaston
-----Original Message-----
From: Eric Fairfield
To: [EMAIL PROTECTED]
Sent: 6/5/00 10:38 AM
Subject: Re: new version of 802.1q?
I believe 802.1s is the standards group working on Spanning Forest (per
vlan stp)
"Andy Harding" < [EMAIL PROTECTED]
<mailto:[EMAIL PROTECTED]> > wrote in message
01f801bfce8a$c41bace0$[EMAIL PROTECTED]">news:01f801bfce8a$c41bace0$[EMAIL PROTECTED]
<01f801bfce8a$c41bace0$[EMAIL PROTECTED]">news:01f801bfce8a$c41bace0$[EMAIL PROTECTED]> ...
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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