asked on

DHCP server & 4505 switch

I have a DHCP server plugged into the 4505 Cisco switch.

1. This switch is configured with Vlan 101 data & Vlan 201 voice.

interface GigabitEthernet2/1
switchport access vlan 101
switchport mode access
switchport voice vlan 201

2. I had to change the port that the W2k3 DHCP server was plugged into to look like this.

interface GigabitEthernet2/32
switchport access vlan 201
switchport mode access
switchport voice vlan 201

3. DHCP works now how ever I have lost my Data Vlan.
-------- ----------- ------ --------
DHCP |--- | Switch | --| PC | + | phone|
-------- ----------- ------ ----------
1. DHCP server 10.10.xxx
2. Switch 172.16.x.x/10.10.x.x
3. PC = 172.16.x.x Phone =10.10.x.x

My issue is that the DHCP server will not issue an IP address to the phones when it is set to
switchport access vlan 101. I need the Vlan 101 for my Data.

interface GigabitEthernet2/1
switchport access vlan 101
switchport mode access
switchport voice vlan 201

I have used the IP DHCP-SERVER command.. still nothing.

pseudocyber

I believe the command you want is "ip helper" which will relay DHCP broadcasts across vlans (routed) to the DHCP server.

A Edwards

ASKER

Can this command work on a 4505 switch.
Because when I log in and type.

Switch-01(config)#ip

gdp Router discovery mechanism
gratuitous-arps Generate gratuitous ARPs f
host Add an entry to the ip hos
host-routing Enable host-based routing
hp-host Enable the HP proxy probe
http HTTP server configuration
icmp ICMP options
igmp IGMP global configuration

I do not see the IP helper command available.

pseudocyber

What IOS are you running?

A Edwards

ASKER

Ver. 12.2

I found it.

Switch-01(config)#int vlan 201
Switch-01(config-if)#ip helper-address 10.10.x.x

pseudocyber

Cool.

A Edwards

ASKER

do I put the gateway address or the DHCP ip address?

ASKER CERTIFIED SOLUTION

pseudocyber