User`s guide

XSR User’s Guide 301
Chapter 12 DHCP Services
Configuring DHCP
Scope Caveat
Keep the following caveat in mind when configuring scopes: IP address pools
may not be configured to overlap. The following conditions apply:
– IP local pools may have multiple DHCP Servers per subnet for
redundancy
– Each DHCP Server should have a unique address pool that does
not overlap pools on other DHCP servers
For example, a correct IP range would be configured as follows:
On subnet 90.1.1.0/24, the DHCP Server A range can be from 90.1.1.1 to
90.1.1.150, and the DHCP Server B range can be from 90.1.1.151 to 90.1.1.254
Manual Bindings
An address binding is a mapping between the IP address and MAC address
or Client-ID of a client. You can manually assign the IP address of a client or
have it assigned automatically from a pool by a DHCP Server.
Manual bindings are IP addresses that have been manually mapped to the
MAC addresses of hosts recorded in the DHCP database. An unlimited
number of manual bindings are stored in the startup-config file.
Automatic bindings are IP addresses that have been automatically mapped to
the MAC addresses of hosts recorded in the DHCP database. Automatic
bindings are saved in persistent storage in the
leases.cfg file.
Manual bindings are set up by first creating a host pool, then specifying the IP
address of the client and hardware-address or client-identifier. The hardware
address is the MAC address. The client identifier, which is required for
Microsoft clients (instead of a hardware address), is formed by concatenating
the media type and the MAC address of the client. To configure manual
bindings, perform the following steps:
1
Enter ip dhcp pool <name> to create a name for the a DHCP Server
address pool and acquire DHCP pool configuration mode.