DHCP for IP Phones and PCs

[startryst]

IP Phones: 10.0.0.0/24

PCs: 192.168.1.0/24

How to implement DHCP for this scenario?

IP Phones and PCs should obtain their ip address from DHCP server.

Topology:

PC<---->IP Phone<--(dot1q)-->Catalyst 3524 PWR<---->Cisco 2811 Router

I prefer to use 2811 act as the DHCP server

Thanks

[thisisshanky]

Create two vlans, one for PC, one for phones.

On the switch ports conected to phones, configure this.

int fa0/1

switchport mode trunk

switchport trunk encap dot1q

switchport trunk native vlan 2

switchport voice vlan 3

On the port that connects between 2811 and 3524

int fa0/24

switchport mode trunk

switchport trunk encap dot1q

switchport trunk allowed vlan 2,3

switchport trunk native vlan 2

On the router side

int fa0/1

no ip add

int fa0/1.10

ip add x,x,x,1 Mask

encapsulation dot1q 2 native

int fa0/1.20

ip add y.y.y.1 Mask

encapsulation dot1q 3

ip dhcp pool PC

network x.x.x.0/24

default-router x.x.x.1

lease 3

dns <>

ip dhcp pool Phone

network y.y.y.0/24

default-router y.y.y.1

lease 3

option 150 ip

dns <>

Hope that helps!

[startryst]

Thanks, I knew the method of using subinterface on 2811 before.

I just want to know is there other method to accomplish this?

Thanks

[Aaron Harrison]

You could have a router with two interfaces, or if you had a layer 3 routing capable switch (which the 3524 isn't) then you could set up VLAN interfaces on that...

[startryst]

The switch is Catalyst 3550-24-PWR which is layer 3 routing capable switch