10-04-2002 06:57 AM
Hi all,
i have the following setup.
Ethernet1 - (Router-Bridge) -TR1 ---Serial---TR2
now i change my setup to
Ethernet1 - (Router-Bridge) -TR1 ---Serial---TR2 - (Router-Bridge) - Ethernet2
-my problem is that the port of the link to the Ethernet2 goes to (STP) blocking.
this is the message on the Ethernet2 Switch
"%SPANTREE-2-RECV_1Q_NON_TRUNK:
Received 802.1Q BPDU on non trunk FastEthernet0/1 on vlan 1"
I have configured DLSW peers from end to end.
I have run STP IEEE on all devices.
Know someone this problem too?
Thanks
Rainer
10-04-2002 09:53 AM
This is a well known problem. Somewhere in your network is misconfigured. A switch (say Switch A) is configured as trunk port; while the router (say Router B) which connects to Switch A is not. At the same time, Router B is a DLSw peer to the router which connects to Ethernet2 in your diagram. As a result, PVST+ BPDU is transported from Switch A to Ethernet2 Switch by DLSw. When Ethernet2 Switch receives PVST+ BPDUs, it thinks that it is a problem. It blocks the port. Please note that Router B and Switch A may not in the diagram you shown.
One of the easiest solutions is to configure dlsw icannotreach saps aa on the router connecting to Ethernet2 switch. However, DLSw will not transport SNAP frames anymore.
I have written a web page to resolve this problem. The page should be posted to CCO soon. The page contains detailed troubleshooting procedure. Please send me an e-mail to dixho@cisco.com if you want me to send you the page. Of course, you are welcome to open a TAC case.
04-26-2004 10:35 AM
Hi, dixho,
Please send me your troubleshooting procedure to me as we met some similar problems and need sloved in urgent.
If you may send me asap,it will very appreciated.
my email addr: matthewl@tw.ibm.com
Matthew Lee
03-23-2003 10:31 PM
Hi Rainer,
i haven`t the Solution for you, but i have the same Problem.
if you have a solution for this problem, could you tell me what
the solution is?
Thanks in advance
Lorenz
03-25-2003 04:47 AM
Hi Lorenz,
i use the workaround "icannnotreach saps aa" for the dlsw peer
between the ethernet networks and
it works!
Best regards
Rainer
03-24-2003 08:46 AM
This is a well known issue. Please check the switch configuration and confirm that you do not misconfiguration. Please see the following URL for details:
http://www.cisco.com/en/US/customer/tech/tk331/tk336/technologies_tech_note09186a0080134efe.shtml
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