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DHCP server & 4505 switch

Posted on 2006-07-11
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Last Modified: 2013-12-23
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.
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Question by:learn2earn
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by:pseudocyber
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I believe the command you want is "ip helper" which will relay DHCP broadcasts across vlans (routed) to the DHCP server.
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Author Comment

by:learn2earn
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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.
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by:pseudocyber
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What IOS are you running?
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by:learn2earn
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Ver. 12.2

I found it.

Switch-01(config)#int vlan 201
Switch-01(config-if)#ip helper-address 10.10.x.x
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by:pseudocyber
Comment Utility
Cool.
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Author Comment

by:learn2earn
Comment Utility
do I put the gateway address or the DHCP ip address?
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Accepted Solution

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pseudocyber earned 125 total points
Comment Utility
You put the IP address of the DHCP server.
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by:learn2earn
Comment Utility
I got it to work thanks
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