[cisco-voip] Phones rebooting

[Ryan Ratliff]

I thought I responded to your earlier email but maybe I didn't...

Span the port going to one of the 7912s and get a sniffer capture for 
30 seconds or so while you are having the resets.

Excessive broadcast or multicast traffic will cause all kinds of issues 
with those phones (as well as ATAs).  The symptoms include poor voice 
quality and random resets.

-Ryan
On Jan 28, 2005, at 12:23 PM, Craig Gauss wrote:

We are running all Cisco gear.  Cisco Call Manager connected directly to
our 4507 Core switch, which in turn is connected via fiber to the
location with VoIP.  That location has 2 Cisco 3550 switches.

-----Original Message-----
From: Jared Mauch [mailto:jared at puck.nether.net]
Sent: Friday, January 28, 2005 11:21 AM
To: Craig Gauss
Cc: cisco-voip at puck.nether.net
Subject: Re: [cisco-voip] Phones rebooting

On Fri, Jan 28, 2005 at 11:06:02AM -0600, Craig Gauss wrote:
> Has anyone experienced random phone resets on Cisco 7912 phones?  We
> have several that just up and reboot for no apparent reason.  We have
> our vendor working on it along with Cisco, but I was just curious to
> see if anyone else had experienced it.

	So, if you're not using cisco switches, (ie:
something to absorb those CDP packets), i've seen issues.. esp if you
have a 7920 on the same broadcast domain..

	the 7960's don't like seeing cdp packets from anyone else.  At
least you can turn it off in the 7920 in the hidden menus, and it stays
off.

	something to watch out for.. you may be able to configure your
switch to blacklist/sink the multicast mac address that the packets get
sent to.

	1:0:c:cc:cc:cc

	- jared

--
Jared Mauch  | pgp key available via finger from jared at puck.nether.net
clue++;      | http://puck.nether.net/~jared/  My statements are only
mine.

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