Question : Cisco catalyst 6509 and Vlans

A network consist of a Catalyst 6509 as a distribution switch (MDF) and several closets consisting of CAT 3550 and 3560 linked up thru fiber. About 16 vlans are set up . All were well ,but just recently all vlans went down except for Vlan 1.
the 6509 is running in hybrid mode . when you issue a show Vlan command in CAT OS all vlan are shown to be active, but when you session to the MFSC and issue the "show vlan int " command all vlan intefaces are down / down. There is no alarm on the Switch everything seems to be OK. Is it the MSFC . Help is greatly needed .Tank you in advance.
 P.S. The 6509 has two sup 720

Answer : Cisco catalyst 6509 and Vlans

No link light is not a good sign, this usually means that no signal was detected on the port. When you performed a
sh port, what was the state of the port? Are there any associated log messages for the downed ports? "sh logg buff 1023"

check out a troubleshooting doc"

http://www.cisco.com/warp/public/473/46.html


I would look into a stable version of code, for both switch types, not sure which you are running.
If you have a valid support contract you should be able to get your TAC engineer to recommend
a stable version for you. Also, through Cisco online resource you can performa bug search on all apllicable
CATOS and IOS code versions.

Cisco Software Bug toolkit can be found on this page"

http://www.cisco.com/en/US/partner/support/index.html

Next time I would not reboot the switches, I would bounce (disable then enable) the ports on both ends to see if that helps. However, you should never loose all th eports. Do you run autonegoitation on the links? I would not do that, try hard setting all port settings to no autoneg, duplex full, speed 1000, turn off flow control, turn off port channeling
(if not using it on those links). Let me know how things go, keep track of your current settings.


harbor235