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тАО11-02-2006 06:29 PM
тАО11-02-2006 06:29 PM
spanning tree recalculating
Is this normal?
The resulting spanning tree topo is always the same, in the logs i can't find any reason(like plugged/unplugged ports).
I already upgraded to the latest firmware on all switches.
This network part has 2 3400cl's as core and multiple 2848 at the edge.
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тАО11-03-2006 12:37 AM
тАО11-03-2006 12:37 AM
Re: spanning tree recalculating
Topology changes make RSTP algorithm to restart again.
Usually in RSTP you can use many features to avoid that like assign edge ports where its connected and its by default OFF.
Stop BPDU in some places on the network.
If that was not helpful, then i would ask you to attach the config of the root at least.
Good Luck !!!
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тАО11-03-2006 12:47 AM
тАО11-03-2006 12:47 AM
Re: spanning tree recalculating
Problem also exists when i remove all redundant links,but keep rstp running.
We already had a consultant looking at it without result.
I also don't see any problem on the uplinks when spanning tree recalculates.
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тАО11-03-2006 03:09 PM
тАО11-03-2006 03:09 PM
Re: spanning tree recalculating
Usually Spanning-Tree won't recalculate unless you have some topology changes happened
Like if one of your blocked links between 2800 and the core changed its path cost (or speed), that will affect.
I would like to ask you if you can attach the 3400 or the Root show tech, and little explain about your network map.
Good Luck !!!
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тАО11-03-2006 07:23 PM
тАО11-03-2006 07:23 PM
Re: spanning tree recalculating
Otherwise in the 3400 release notes it provides some good information on how to read the output of 'show span detail'
You may also want to look into the new BPDU filtering and detection options available.
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тАО11-05-2006 09:05 PM
тАО11-05-2006 09:05 PM
Re: spanning tree recalculating
It happens to often to just leave it.
i attached the show tech of the root switch.
I will add a map of the switches in the next reply.
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тАО11-05-2006 09:16 PM
тАО11-05-2006 09:16 PM
Re: spanning tree recalculating
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тАО11-05-2006 11:40 PM
тАО11-05-2006 11:40 PM
Re: spanning tree recalculating
I also can't filter bpdu's, i have done this in the past. Does it only works for some stp versions?
On this port i also see that operedgeport is no, while i forced this port to edge.
BESW56KE(config)# show spanning-tree 36 detail
Status and Counters - RSTP Port(s) Detailed Information
Port : 36
Status : Up
BPDU Filtering : No
Role : Designated
State : Forwarding
Priority : 128
Path Cost : 200000
Root Path Cost : 4
Root Bridge ID : 16384:001279-034c00
Designated Bridge ID : 40960:001560-002680
Designated Port ID : 128:36
AdminEdgePort : Yes
OperEdgePort : No
AdminPointToPointMAC : Force-False
OperPointToPointMAC : No
Aged BPDUs Count : 0
Loop-back BPDUs Count : 0
TC Detected : 6
TC Flag Transmitted : 0 TC ACK Flag Transmitted : 22
TC Flag Received : 0 TC ACK Flag Received : 0
RSTP RSTP CFG CFG TCN TCN
BPDUs Tx BPDUs Rx BPDUs Tx BPDUs Rx BPDUs Tx BPDUs Rx
---------- ---------- ---------- ---------- ---------- ----------
868 0 83418 9 0 19
BESW56KE(config)#
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тАО11-06-2006 08:57 AM
тАО11-06-2006 08:57 AM
Re: spanning tree recalculating
In your config I noticed that you had single port trunks configured which is not necessary. It shouldn't cause a problem though.
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тАО11-06-2006 06:06 PM
тАО11-06-2006 06:06 PM
Re: spanning tree recalculating
now i have very strange errors.
first i found a port with a lot of tc detected. i disabled it and another port on another switch had the same issue.
this morning i checked again, again another switch and another port.
this are always ports from a switch directly to one of the cores.
This morning it was happening on one of the cores towards a user switch.
what i find strange is that only one side of the link sees a topology change. If there was really a problem i would think both sides would notice.
btw. all switches are connected through cat5e cables on gigabit. Can cable lenghts cause such a problem?