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November 29th, 2005 07:00
problem with spanning tree
Hello, i have a problem with spanning tree - maybe someone can give me a hint?!
My scenario looks like this:
I have 6 PC-5324 ...and two VLANs (ID 30 and 10).
Three of the switches have only configured VLAN 10 and are chained together, so that VLAN 10 is accessible on every port of these three switches - works without problems. A fourth switch has VLAN10, too and is chained with the other three ... Additionally this switch has 4 ports in a special VLAN 20 for uplinking to our providers switch.
On switch 5 i have VLAN 30 - and again my special VLAN 20 for connecting to our provider.
Now i try to add switch Nr. 6 ... which needs to have connection to VLAN 30 and VLAN 10.
I connected switch 1 with vlan 10 of switch 6 (ports in trunc-mode) - and i have VLAN 10 available on the switch ... works without a problem.
But - as soon as i connect switch 5 with VLAN 30 of switch 6 ... switch 6 is setting the port i used for connecting VLAN 10 into blocking mode ... neither traffic to VLAN 30 nor to VLAN 10 is coming through anymore.
Why does this happen? I assume i have loop anywhere?
Can this loop be created by the switch/router of our provider - as two of my switches are connected to them?
How is STP influenced by VLANs? I always thought, that STP would take VLANs into account? Or is it just on a switch basis?
Is there a way to identify the loop by using any logs?
Thanks for any help!
My scenario looks like this:
I have 6 PC-5324 ...and two VLANs (ID 30 and 10).
Three of the switches have only configured VLAN 10 and are chained together, so that VLAN 10 is accessible on every port of these three switches - works without problems. A fourth switch has VLAN10, too and is chained with the other three ... Additionally this switch has 4 ports in a special VLAN 20 for uplinking to our providers switch.
On switch 5 i have VLAN 30 - and again my special VLAN 20 for connecting to our provider.
Now i try to add switch Nr. 6 ... which needs to have connection to VLAN 30 and VLAN 10.
I connected switch 1 with vlan 10 of switch 6 (ports in trunc-mode) - and i have VLAN 10 available on the switch ... works without a problem.
But - as soon as i connect switch 5 with VLAN 30 of switch 6 ... switch 6 is setting the port i used for connecting VLAN 10 into blocking mode ... neither traffic to VLAN 30 nor to VLAN 10 is coming through anymore.
Why does this happen? I assume i have loop anywhere?
Can this loop be created by the switch/router of our provider - as two of my switches are connected to them?
How is STP influenced by VLANs? I always thought, that STP would take VLANs into account? Or is it just on a switch basis?
Is there a way to identify the loop by using any logs?
Thanks for any help!
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GregG1
2 Intern
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812 Posts
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November 29th, 2005 10:00
HobiDE
3 Posts
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November 29th, 2005 11:00
Does this mean, that if i would connect to 5324s with two cables ... that the 5324 would disable one of the two connections at once? I'm just asking, as i was in the impression, that i did this already without the switch having blocked a interface ...
For my problem this means, that it is not possible to configure the desired configuration?
GregG1
2 Intern
•
812 Posts
0
November 29th, 2005 12:00