12-20-2007 11:43 AM - edited 03-15-2019 07:54 AM
Hey everyone,
I have a cisco router 2811.
Is it possible to use the dhcp server of windows 2003 instead the dhcp of the router ?
in this case which parameters to enter in the scope options?
i added : dns, gateway, tftp, ntp, but it seems missing something...
any ideas?
My phones and computer are on the same subnet, 40 computers/servers, 20 phones
Of course the best/alternative solution could be to make another vlan just for ipphones, and set the router as a dhcp server....
Whats your advices ?
thanks in advance.
Solved! Go to Solution.
12-20-2007 12:15 PM
Configure the switch for at least one additional VLAN, per linksys manual. Make all ports where there is a PC chained of a phone as "trunks", unless the linksys supports a cisco phone+PC setting.
Configure ports where there is only a PC or phone, as access for that VLAN.
On the router, configure subinterfaces on the interface connecting to the switch. Define the VLAN as encapsulation dot11 XX with XX the VLAN ID for the subinterfaces.
Configure a dhcp pool on the router with the addresses used for CCME. configure in there option 150.
This is enough to keep telephony separated from PC's traffic, that is always a good thing.
12-20-2007 11:58 AM
Which switch do you have ? If it supports VLANs, please separate phones and PC, let the router be DHCP for the phones.
If it doesn't, just add "option 150" with the Ip address of the CCME router, in the dhcp scope on server, until you get a switch suitable for Ip telephony.
Hope this helps, please rate post if it does!
12-20-2007 12:03 PM
Linksys srw224g4p (poe, qos, smnp, vlans,...)
It supports VLAN.
Any docs to recommand ?
thanks for the informations
12-20-2007 12:15 PM
Configure the switch for at least one additional VLAN, per linksys manual. Make all ports where there is a PC chained of a phone as "trunks", unless the linksys supports a cisco phone+PC setting.
Configure ports where there is only a PC or phone, as access for that VLAN.
On the router, configure subinterfaces on the interface connecting to the switch. Define the VLAN as encapsulation dot11 XX with XX the VLAN ID for the subinterfaces.
Configure a dhcp pool on the router with the addresses used for CCME. configure in there option 150.
This is enough to keep telephony separated from PC's traffic, that is always a good thing.
12-20-2007 12:20 PM
thanks again
12-20-2007 12:23 PM
No problem. I don't know the linksys switch, but it should work fine.
Thanks for the nice rating and good luck!
12-27-2007 01:51 PM
Hi again
on the switch
I configured with one more vlan :
1- native(data)
2- voice
and set the ports as "trunk" where there are PC chained of a phone and "access" where its only pc or phone.
On my cme/router i created a pool
ip dhcp pool voice
network 192.168.150.0 255.255.255.0
dns-server 192.168.140.3
domain-name ***************
default-router 192.168.150.1
option 150 ip 192.168.150.1
and my two interfaces for 2 vlans
interface FastEthernet0/0.1
description *data_traffic*
encapsulation dot1Q 1 native
ip address 192.168.140.251 255.255.255.0
no snmp trap link-status
!
interface FastEthernet0/0.2
description *voice_traffic*
encapsulation dot1Q 2
ip address 192.168.150.1 255.255.255.0
no snmp trap link-status
but my phones still use the bad vlan(1).... and the bad dhcp (windows2003) instead the one on the router. they have to use the vlan 2
how can i change that ? how can i configure phones to use the vlan 2
sorry i'm novice.
12-27-2007 01:59 PM
Hi,
the router is configured ok. Now what happens is that the linksys switch doesn't supports CDP so it can't tell the phones which vlan to use.
You must then configure statically the vlan to use into the phone. Enter settings, go to network, press **# admin VLA id-> edit, enter 2, press validate.
That should do it.
12-28-2007 07:48 AM
thanks, i set a phone on admin vlan id 2
but its staying on "Configuring ip..."
what could be the pb ?
on "show dhcp server" i got:
DHCP server: 192.168.150.1
Leases: 0
Offers: 0 Requests: 0 Acks : 0 Naks: 0
Declines: 0 Releases: 0 Query: 0 Bad: 0
im not sure but i guess it's show the dhcp server on the router is working and available.
any ideas???
12-28-2007 11:13 AM
Hi, I was wrong, the vlan that matters is the operational, not the admin one.
But, operational vlan cannot be configured from the phone.
I'm afraid you have to keep phones and PC in the smae vlan for now, If I find a solution for this, I will post it here. If you must use the win dhcp server, go in there and add option 150 and tftp with CME's address.
12-28-2007 02:25 PM
ok thanks, its working now.
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