Strange VLAN Behaviour

Unanswered Question
Feb 1st, 2008
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Hi Folks,

Appreciate any help on a Vlan issue.

Basically have a vlan configured on a MSFC

Have a number of machines connected to switchports in this vlan. When we power up the machines they can not connect to anything outside the vlan. Machines get IP's via a helper address and can ping the default vlan gateway. After roughly 15-20 minutes, comnnections are allowed out. I have no ACL blocking in place. This happens everytime we power the machines down for a while and restart. There is nothing local on the machines blocking connections (firewall,AV), I have tried various builds and it makes no difference. The switchports are only configured for access to the said vlan. There is no issue with spantree or portfast settings. Help

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Kevin Dorrell Fri, 02/01/2008 - 04:05
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Are you using port security on that VLAN?


Also: check the consistency of the MST-VLAN mapping on all the switches you have, and check the VLANs allowed on each of the trunks - they should correspond to whole sets of MST instances, nothing less, nothing more.


Kevin Dorrell

Luxembourg


scuzzlightyear Fri, 02/01/2008 - 06:06
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Not using port security, using an old version of catos on the 6500, doesn't have the spantree mst command

Kevin Dorrell Fri, 02/01/2008 - 06:17
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I'm sorry. What on earth made me think we were dealing with MST? It must be Friday again!


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