Question about Power Dsine Computers & Internet
SOURCE: SD 2008 linksys switch slow
Same problem here - switch appears to revert to 10MB on some ports and 100MB on others. Tried to force 1000 from NIC, but that just lost connectivity - had to reset back to auto to get any connectivity at all
Posted on Nov 11, 2008
If you also have a standard copper cable (or a second fibre cable) connecting the two switches (for resilience perhaps?), this issue is probably being caused by something called Spanning Tree. This is implemented on switches as a 'loop avoidance' system, and can look like you have described with one end 'ip' and the other end no lights.
On the Cisco switch, get to a telnet/ssh/console session, log in and enter show spanning-tree and press enter.
have a look to see if the fibre interface has a status (sts column) of BLK. If it has, then this is called 'blocking' and will remain like that until you remove the second link to the other switch.
Hope that this has helped!
Posted on Oct 17, 2010
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