[cisco-voip] 7936 DHCP issue

[Matt Slaga (US)]

Jonathon hit it on the head earlier.

On all of our installs, we hard code the port for 7935/36s and ata-186s
to the voice vlan.  If you read the Cisco documentation, it specifies
this.  There is no switch in these devices, hence it will not understand
vlan tagging.
 
Matt


-----Original Message-----
From: cisco-voip-bounces at puck.nether.net
[mailto:cisco-voip-bounces at puck.nether.net] On Behalf Of Mike Armstrong
Sent: Tuesday, February 21, 2006 7:44 AM
To: cisco-voip at puck.nether.net; voipermike at gmail.com
Subject: Re: [cisco-voip] 7936 DHCP issue

It sounds like the 7936 doesn't completely understand DHCP.   If you
unplug 
the 7936 and reconnect to the same VLAN (perhaps thru a different
switchport, if possible) does it come up OK with the same IP address it
had before?  If so, try unplugging it and removing that address from the
DHCP pool, and see if the 7936 can get another IP from the same pool.
Then, try the other VLAN; these test should identify the point in the
DHCP handshake where it breaks.  Also, what is your lease time -- how
does that compare with the "several hours" it takes to acquire a new IP
on the 2nd VLAN?  If you can sniff the switchport when the 7936 is
plugged it, it would be an interesting trace compared with, say, a 7940
doing the same dance.  We've had several problems with the conference
phones' initialization, but never pinned anything down.

Mike Armstrong
UF/IFAS CREC
Lake Alfred, FL

> Date: Mon, 20 Feb 2006 15:08:24 -0600
> From: "Mike Mike" <voipermike at gmail.com>
> Subject: [cisco-voip] 7936 DHCP issue
> To: cisco-voip at puck.nether.net
> Message-ID:
> <8bbfc1f40602201308x1f224394r878602afaaa26d0b at mail.gmail.com>
> Content-Type: text/plain; charset="iso-8859-1"
>
> Conference phone gets plugged into a port on the first voice vlan and 
> gets an IP from the DHCP pool no problem. Customer moves to another 
> switchport (same switch) configured on one of the other voice vlans 
> and it takes several hours to pull a new IP. Customer is using a 
> different voice vlan for each of three floors. The 7936 has the latest

> firmware but also experienced the problem on previous version. Also, a

> new conf phone has been tried with same results. Moving 7940's and 
> 7960's between floors works just fine.
> Last
> test was to create reservations in each pool but apparently that 
> didn't work. Anyone else seen this behavior with the 7936?
>
> Thanks

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