SG300-28P Voice VLAN issue

[Chris Hein]

Hi,

I was running firmware 1.1.2.0 and everything was working fine on 2 of these switches, connected via fiber.  I tried upgrading to the latest firmware (1.3.5.58) and had no luck.  Our phones which are Avaya 9650 VOIP handsets could not find the router, would not find DHCP, and were waiting for LLDP.  The update was only applied on the further away switch from the PBX, yet it still messed up the other switch.  I put the firmware back to the original active version and everything started working again.

Nothing else changed except when I rolled back from the firmware version It left any phones plugged in to ports, it changed their tagging to untagged.  I put this back and everything worked fine. 

Is there an incompatiblity with this firmware with my phones, or what else could be the problem?

[Tom Watts · Accepted solution]

Hi Chris, I think one of the problem is, the 1.1.2.0 is very different than every release after. When the 1.2.7.76 firmware was introduced it changed the XML in the switch. If you're jumping up from the 1.1.2.0 to any later release you really should erase your switch config and do not reload a config file.

-Tom
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[Chris Hein]

Interesting idea Tom.  It could be worth a try, even though it would be a decent amount of work.  Is there other evidence of this firmware "jump" causing other issues besides mine?

[Tom Watts]

https://supportforums.cisco.com/search.jspa?peopleEnabled=true&userID=&containerType=14&container=2141&spotlight=true&q=1.2.7.76+xml

If you want to dig through some posts.

I'm sure could find some. It looks like the 1.2.7.76 release notes were removed off the download page even.

-Tom
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[Chris Hein]

This solved it for me.  I bought a new switch, built config from scratch after upgrading to the latest version of the firmware and installed.  No issues.  This switch just doesn't like to upgrade to this version.  Thanks for your help!