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24032
July 9th, 2010 19:00
Dell 6248 & Cisco 4507 Spanning Tree Problems
Hello All
I have recently swapped out entire building on our 4 building campus with Dell 6248's. One of the closets has a 6224 stacked with a 6248 in it. This building is uplinked to our Cisco Core 4507 via Fiber.
Things have been working well as our Cisco 7960 phones and computers connected though seem to work fine. The issue I am finding in my logs are that there is some type of spannig-tree loop going on and its causing outages.
Below is some of the log file entires I am getting
<189> JUL 09 20:34:55 10.1.8.35-1 TRAPMGR[231072800]: traputil.c(906) 18 %% Spanning Tree Topology Change: 0, Unit: 1
<189> JUL 09 20:38:08 10.1.8.35-1 TRAPMGR[214503792]: traputil.c(906) 19 %% Unit 3 Port 46 is transitioned from the Forwarding state to the Blocking state in instance 0
<189> JUL 09 20:38:44 10.1.8.35-1 TRAPMGR[214503792]: traputil.c(906) 20 %% Unit 3 Port 46 is transitioned from the Learning state to the Forwarding state in instance 0
Here is what the two port configs look like
PORT FROM SWITCH THAT IS UPLINKED TO SWITCH THAT HAS THE OUTGOING FIBER ON IT
description
mtu 9216
switchport mode general
no switchport general acceptable-frame-type tagged-only
switchport general allowed vlan add 2,4-5,16,32,48,64,80,96,112,128 tagged
switchport general allowed vlan add 144,160,232,248,264,280 tagged
switchport general allowed vlan add 1 tagged
PORT CONFIG FROM SWITCH THAT IS UPLINKING TO FIBER
description
mtu 9216
switchport mode general
no switchport general acceptable-frame-type tagged-only
switchport general allowed vlan add 2,4-5,16,32,48,64,80,96,112,128 tagged
switchport general allowed vlan add 144,160,232,248,264,280 tagged
switchport general allowed vlan add 1 tagged
FINALLY THE UPLINK FIBER PORT TO OUR CISCO CORE
description 'Uplink_to_Core'
mtu 9216
switchport mode general
no switchport general acceptable-frame-type tagged-only
switchport general allowed vlan add 2,4-5,16,32,48,64,80,96,112,128 tagged
switchport general allowed vlan add 144,160,192,232,248,264,280 tagged
switchport general allowed vlan add 1 tagged
thanks in advance
JustinY
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117 Posts
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July 12th, 2010 16:00
Do you see any other ports change spanning tree state?
You could setup spanning tree guards on all the interfaces.
spanning-tree guard loop
spanning-tree guard root
w2brw
2 Posts
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July 13th, 2010 09:00
Yes on ports that have my Meru Access Points connected them I am constantly see the spanning tree error.
JustinY
1 Rookie
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117 Posts
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July 14th, 2010 17:00
Do your access points connect to each other? It seems like they might be creating spanning tree loops. The differing connection strength or them losing connections to each other could cause spanning tree reconvergence that your seeing.
Unless you need your Access points to run STP see if you can disable it on them and enable spanning-tree guard loop on the interfaces your access points connect to. Idealy you dont want the access points connecting to each other. Force all traffic to return to the switch not hop from ap to ap.