Enabling multiple DHCP Options (150, 176 & 242) on Cisco Switch

[Mikey John]

Hi,

 I have a Cisco 4510R-E switch configured with DHCP locally for the Cisco IP phones.

ip dhcp pool ABCD
network x.x.x.x 255.255.255.0
default-router x.x.x.x 
option 150 ip x.x.x.x x.x.x.x 
dns-server x.x.x.x x.x.x.x 
domain-name abc.com
netbios-name-server x.x.x.x x.x.x.x

We are now installing Avaya IP phones in our office for certain teams, and I was looking to use the existing DHCP scope for these new IP phones (to save IP space) since the DHCP scope utilization is less. There are two ports per user desk, so one would be used for Cisco IP phones and one for Avaya. The switchport will have similar port configs for Data and Voice Vlan

I had a few queries around this.

1) Can we configure Option 176 and option 242 within the same DHCP scope?

2) Does the script (see below) has the correct syntax?

option 242 ascii MCIPADD=x.x.x.x,MCPORT=1719,HTTPSRVR=x.x.x.x,HTTPDIR=XYZ,L2QVLAN=XXX,L2Q=XXX

option 176 ascii MCIPADD=x.x.x.x,MCPORT=1719,TFTPSRVR=x.x.x.x,HTTPDIR=XYZ,L2QVLAN=XXX,L2Q=XXX

3) Will adding these two DHCP options (176 and 242) in the existing DHCP scope cause an outage (reboot) on the existing CIsco IP phones?

Cheers

Mikey

[pieterh]

NO adding the options to the existing scope will not interfere with running Cisco phones.

The Cisco phone (afaik) looks for other dhcp-option numbers and CDP/LLDP packets.

the syntax seems logical, 
but found this configuration example that shows space instead of comma

device(config-dhcp-voip)# option 176 mcipadd 1.1.1.2 mcport 1719

[Mikey John]

Thanks for your reply. Appreciate that!!

Cheers

Mikey