Configuring X Window System Display Manager IP addresses (option 49)

Option 49 of RFC 2132 specifies a list of IP addresses of systems that are running the X Window System Display Manager and are available to the client.

The X Window client is a DHCP client in a network that solicits configuration information by broadcasting a DHCP discovery packet on bootup or when the DHCP client is enabled. The DHCP server provides the IP addresses of systems running the X Window System Display Managers available in the network in their preferred order as part of the DHCP offer message.

On receipt of a discovery packet from the client, a DHCP offer message must be sent back. Option 49 must be added with the IP addresses of systems running the X Window System Display Manager in the network, along with other mandatory options. You can configure a maximum of three IP addresses in a DHCP server pool.

Note: Option 49 is ignored if the client is a non-X Window client.

Enter global configuration mode.
```
device# configure terminal
```

Configure an address pool in the DHCP server and enter DHCP server pool configuration mode.
```
device(config)# ip dhcp-server pool cabo
```

Enter the xwindow-manager command along with the IP addresses of the X Window System Display Managers separated by spaces.
```
device(config-dhcp-cabo)# option 49 ip 10.38.12.1 10.38.12.3 10.38.12.5
```

The following example configures the IP addresses of systems running the X Window System Display Manager in the DHCP configuration pool.

device# configure terminal
device(config)# ip dhcp-server pool cabo
device(config-dhcp-cabo)# option 49 ip 10.38.12.1 10.38.12.3 10.38.12.5