Acquire an IP Address From a Server Residing Outside the Client Network

In this example, a DHCP relay server is set up using various DHCP server and DHCP relay commands and options from the preceding sections. The example connects port 1 of switch 1 to port 1 of switch 2, and connects port 2 of switch 2 to port 1 of switch 3.

Create vlan 2 in switch 1 with port 1 as the member port. Then, add a route to the 30.0.0.0 network through 20.0.0.2 (switch 2).

SEFOS# configure terminal
SEFOS(config)# vlan 2
SEFOS(config-vlan)# ports extreme-ethernet 0/1
SEFOS(config-vlan)# exit
SEFOS(config)# interface vlan 2
SEFOS(config-if)# shutdown
SEFOS(config-if)# ip address 20.0.0.1 255.0.0.0
SEFOS(config-if)# no shutdown
SEFOS(config-if)# exit
SEFOS(config)# interface extreme-ethernet 0/1
SEFOS(config-if)# switchport pvid 2
SEFOS(config-if)# exit
SEFOS(config)# ip route 30.0.0.0 255.0.0.0 vlan 2
SEFOS(config)# end

View the VLAN configurations and route configuration.

SEFOS# show ip interface vlan 2
 
vlan2 is up, line protocol is up
Internet Address is 20.0.0.1/8
Broadcast Address  20.255.255.255
 
SEFOS# show vlan id 2
 
Vlan database
-------------
Vlan ID             : 2
Member Ports        : Ex0/1
Untagged Ports      : None
Forbidden Ports     : None
Name                :
Status              : Permanent
----------------------------------------------------
 
SEFOS# show ip route
 
Codes: C - connected, S - static, R - rip, B - bgp, O - ospf
C 10.0.0.0/8  is directly connected, vlan1
C 20.0.0.0/8  is directly connected, vlan2
S 30.0.0.0/8  is directly connected, vlan2

Create vlan 2 with port 1 as a member port and vlan 3 with port 2 as a member port in switch 2.

SEFOS# configure terminal
SEFOS(config)# vlan 2
SEFOS(config-vlan)# ports extreme-ethernet 0/1
SEFOS(config-vlan)# exit
SEFOS(config)# interface vlan 2
SEFOS(config-if)# shutdown
SEFOS(config-if)# ip address 20.0.0.2 255.0.0.0
SEFOS(config-if)# no shutdown
SEFOS(config-if)# exit
SEFOS(config)# interface extreme-ethernet 0/1
SEFOS(config-if)# switchport pvid 2
SEFOS(config-if)# exit
SEFOS(config)# vlan 3
SEFOS(config-vlan)# ports extreme-ethernet 0/2 untagged extreme-ethernet 0/2
SEFOS(config-vlan)# exit
SEFOS(config)# interface vlan 3
SEFOS(config-if)# shutdown
SEFOS(config-if)# ip address 30.0.0.2 255.0.0.0
SEFOS(config-if)# no shutdown
SEFOS(config-if)# exit
SEFOS(config)# interface extreme-ethernet 0/2
SEFOS(config-if)# switchport pvid 3
SEFOS(config-if)# no shutdown
SEFOS(config-if)# end
SEFOS# show vlan id 2
 
Vlan database
-------------
Vlan ID             : 2
Member Ports        : Ex0/1
Untagged Ports      : None
Forbidden Ports     : None
Name                :
Status              : Permanent
----------------------------------------------------
 
SEFOS# show vlan id 3
 
Vlan database
-------------
Vlan ID             : 3
Member Ports        : Ex0/2
Untagged Ports      : Ex0/2
Forbidden Ports     : None
Name                :
Status              : Permanent
----------------------------------------------------
 
SEFOS# show ip interface vlan 2
 
vlan2 is up, line protocol is up
Internet Address is 20.0.0.2/8
Broadcast Address  20.255.255.255
 
 
SEFOS# show ip interface vlan 3
 
vlan3 is up, line protocol is up
Internet Address is 30.0.0.2/8
Broadcast Address  30.255.255.255

Enable the DHCP server in switch 1.

Since the client is in vlan 3, an address pool with the 30.0.0.0 network must be configured in the server.

SEFOS# configure terminal
SEFOS(config)# service dhcp-server
SEFOS(config)# ip dhcp pool 1
SEFOS(dhcp-config)# network 30.0.0.0
SEFOS(dhcp-config)# lease 0 0 30
SEFOS(dhcp-config)# end
SEFOS# show ip dhcp server information
 
DHCP server status              : Enable
Send Ping Packets               : Disable
Debug level                     : None
Server Address Reuse Timeout    : 5 secs
Next Server Adress              : 0.0.0.0
Boot file name                  : 
 
SEFOS# show ip dhcp server pools
 
Pool Id                       : 1
----------------------------------
Subnet                        : 30.0.0.0
Subnet Mask                   : 255.0.0.0
Lease time                    : 1800 secs
Utilization threshold         : 75%
Start Ip                      : 30.0.0.1
End Ip                        : 30.255.255.255

Enable DHCP relay in switch 2.

This action connects the networks between the client and server.

SEFOS# configure terminal
SEFOS(config)# service dhcp-relay
SEFOS(config)# end
SEFOS# show ip dhcp relay information
 
Dhcp Relay                  : Enabled
Dhcp Relay Servers only     : Disabled
 
DHCP server                 : 0.0.0.0
 
Dhcp Relay RAI option       : Disabled
Debug Level                 : 0x1
 
No of Packets inserted RAI option               : 0
No of Packets inserted circuit ID suboption     : 0
No of Packets inserted remote ID suboption      : 0
No of Packets inserted subnet mask suboption    : 0
No of Packets dropped                           : 0
No of Packets which did not inserted RAI option : 0

Configure the DHCP client.
This example uses a SPARC computer running Oracle Solaris 10 OS as the DHCP client. The dual 10-Gigabit Ethernet XFR SR network interface card (option X1109A-Z) is installed in the SPARC computer and uses the instance ixgbe. The DHCP daemon is active in Oracle Solaris 10 by default, so no DHCP configuration is needed.

Use the correct cable to connect a port on the NIC to port 70 of switch 2.

See Multiple-Switch Configuration. Issue the following commands after connecting the cables. If a different DHCP client is used, follow the appropriate instructions in the administration guide for the client.

# ifconfig ixgbe1 plumb up
# ifconfig -a
lo0: flags=2001000849<UP,LOOPBACK,RUNNING,MULTICAST,IPv4,VIRTUAL> mtu 8232 index 1
        inet 127.0.0.1 netmask ff000000
e1000g0: flags=1000803<UP,BROADCAST,MULTICAST,IPv4> mtu 1500 index 2
        inet 10.7.58.46 netmask ffffff00 broadcast 10.7.58.255
        ether 0:14:4f:20:f4:cc
ixgbe1: flags=1000843<UP,BROADCAST,RUNNING,MULTICAST,IPv4> mtu 1500 index 12
        inet 0.0.0.0 netmask ff000000
        ether 0:1b:21:4a:6f:fc

Execute the DHCP request, and wait 15-20 seconds for the command prompt to return.
```
# ifconfig ixgbe1 dhcp
```

Show that IP 30.0.0.1 is assigned to the DHCP client port.

# ifconfig -a
 
lo0: flags=2001000849<UP,LOOPBACK,RUNNING,MULTICAST,IPv4,VIRTUAL> mtu 8232 index 1
            inet 127.0.0.1 netmask ff000000
e1000g0: flags=1000803<UP,BROADCAST,MULTICAST,IPv4> mtu 1500 index 2
            inet 10.7.58.46 netmask ffffff00 broadcast 10.7.58.255
            ether 0:14:4f:20:f4:cc
ixgbe1: flags=1004843<UP,BROADCAST,RUNNING,MULTICAST,DHCP,IPv4> mtu 1500 index 12
            inet 30.0.0.1 netmask ff000000 broadcast 30.255.255.255
            ether 0:1b:21:4a:6f:fc

Display the IP binding by issuing the following command in switch 1 (DHCP server).

SEFOS# show ip dhcp server binding
 
Ip         Hw           Hw                 Binding    Expire
Address   Type         Address             State      Time
-------  -------       ------              --------   ----------
30.0.0.1 Ethernet   00:1b:21:4a:6f:fc   Assigned   Apr 10 11:39:28 2010

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DHCP Administration Guide

Acquire an IP Address From a Server Residing Outside the Client Network