[IM-Talk] Unable to compute switch-to-switch connectivity

[JohnBull]

Hello.

I'm running 5.4.1 and really like the Layer 2 feature, but have encountered the 
problem "Unable to compute switch-to-switch connectivity using forwarding 
database entries on vlans ..."; approximately 20 of our vlans are listed.

I used the "#erase" command without any change, Layer 2 database erased and 
re-created with same issue.

However, while examing the "switches.log", I noticed that one switch, 
192.168.2.16, seemed to be appearing in most, if not every, exception message:

2011-03-12 09:44:17-0800 [PoolThread-55287360-5] Unable to identify simple 
connection between 20@192.168.2.42 and 20@192.168.2.16: results = []

2011-03-12 09:44:17-0800 [PoolThread-55287360-5] EXCEPTION: 
<SwitchConnectionException: 20@192.168.2.42, 20@192.168.2.16> (20@192.168.2.42, 
20@192.168.2.3, 20@192.168.2.14, 20@192.168.2.29, 20@192.168.2.30, 
20@192.168.2.31, 20@192.168.2.33, 20@192.168.2.34, 20@192.168.2.43, 
20@192.168.2.51, 20@192.168.2.20, 20@192.168.2.21, 20@192.168.2.22, 
20@192.168.2.23, 20@192.168.2.28, 20@192.168.2.1, 20@192.168.2.35, 
20@192.168.2.41, 20@192.168.2.44, 20@192.168.2.47, 20@192.168.2.48, 
20@192.168.2.32, 20@192.168.2.37, 20@192.168.2.38, 20@192.168.2.39, 
20@192.168.2.40, 20@192.168.2.50, 20@192.168.2.53, 20@192.168.2.7, 
20@192.168.2.9, 20@192.168.2.2, 20@192.168.2.4, 20@192.168.2.5, 20@192.168.2.6, 
20@192.168.2.8, 20@192.168.2.17, 20@192.168.2.11, 20@192.168.2.12, 
20@192.168.2.13, 20@192.168.2.16, 20@192.168.2.24, 20@192.168.2.25, 
20@192.168.2.27, 20@192.168.2.18, 20@192.168.2.19)

The switch is a Dell PowerConnect 3448 and trunked, via fiber, to a Cisco 6509 
in a switched network.  Moreover, we're a mostly Cisco shop with other Dell 
switches that don't exhibit this problem.

Does anyone know what causes the exception to be thrown and/or what I do to 
troubleshoot it?

Thank you in advance for any assistance that may be offered.


-------------------- m2f --------------------

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http://forums.dartware.com/viewtopic.php?p=3262#3262





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