You can use client class processing on the DHCP server to not offer any leases
to Avaya phones on the pools ( or vlans ) that are NOT meant for the phones.
For the pools (or vlans ) that ARE meant for the phones you can allow all
client classes.
The Avaya phones have a client class identifier that they politely include in
their discover.
Here it is in ISC DHCPD style:
# The following options are required by Avaya IP Phones at bootup
option hbcs-avaya-176 code 176 = text; #Used by 46xx hardware
option hbcs-avaya-242 code 242 = text; #Used by 96xx and newer hardware
# Let's dump the phones into a client class in order to deny them access to
# our desktop pools. We could also do this by mac vendor id, but option 60
# is a more direct approach. I captured the value ccp.avaya.com with Wireshark.
class "avaya" {
#match if ( substring(hardware,1,3) = 00:04:0D);
match if substring (option vendor-class-identifier, 0, 13) =
"ccp.avaya.com" ;
}
subnet 205.153.181.0 netmask 255.255.255.0 {
pool {
deny members of "avaya";
allow all clients;
range 205.153.181.49 205.153.181.52;
authoritative;
}
Thanks,
Lou Goddard
Network Engineer
302-552-8053
[email protected]
From: Patrick Printz <[email protected]>
Sent: Wed, 11/9/2011 11:54am
To: Enterasys Customer Mailing List <[email protected]>
Subject: [enterasys] IP Phones & DHCP
Anyone running Avaya 9600 series phones ever have an issue where the phones
talk to DHCP on the default VLAN, but when they switch to the voice VLAN, they
do not talk? I have been dealing with this for weeks, and the phones are not
talking
on the voice VLAN like they should. I have done traces and it appears that
DHCP receives the request and responds, but the phone never receives the
response. The response gets to the uplink port and then stops. I have messed
with lldp, ciscodp, and the vlan
egress settings. I cannot see why the phone is not receiving the DHCP response
when it switches to the voice vlan.
Patrick Printz
Network Infrastructure
Quinsigamond Community College
670 West Boylston Street
Worcester, MA 01606-2092
w. 508-854-7517
c. 508-726-9529
"If a man is called a street sweeper, he should sweep streets even as
Michelangelo painted, or Beethoven composed music, or Shakespeare wrote poetry.
He should
sweep streets so well that all the hosts of heaven and Earth will pause to
say, Here lived a great street sweeper who did his job well."
~Martin Luther King, Jr.
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