Enterasys Networks CSX7000 Manuel d'utilisateur Page 309

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Central Site Remote Access Switch 309
C
ONFIGURING
A
DVANCED
IP R
OUTING
DHCP Relay Agent
DHCP CONFIGURATION ELEMENTS
DHCP/BOOTP RELAY AGENT ENABLE/DISABLE FLAG
A global flag that indicates whether the system is relaying the DHCP/BOOTP BOOTREQUEST
messages or not. The relay agent is disabled by default.
R
ELAY DESTINATION IP ADDRESSES
These are the IP addresses to which the system will relay BOOTREQUEST messages. For relay
destinations which are broadcast/multicast IP addresses, the network interface to which the
messages should be relayed also needs to be configured.
H
OP COUNT THRESHOLD
This configuration element is used to limit the number of relay agents through which DHCP/
BOOTP BOOTREQUEST messages can travel. BOOTREQUEST messages with a hops field value
greater than this value will be discarded. The valid range is between 0 and 16, and the default is 4.
DHCP BACKGROUND INFORMATION
The DHCP/BOOTP Relay Agent feature provides a solution to the dynamic IP address assignment
problems in the ISDN WAN environment. Those IP host devices with the DHCP client software
that are connected to a central LAN through ISDN remote bridges are now able to obtain their IP
addresses from a DHCP server located on a central LAN.
The Dynamic Host Configuration Protocol (DHCP) provides configuration parameters to IP host
devices. DHCP consists of two components: a protocol for delivering host-specific configuration
parameters (name servers, time servers and many more) from a DHCP server to a host; and a
mechanism for allocation of network addresses to hosts. Since remote devices are not always on a
main network (a corporate LAN, Internet), and there are only limited IP addresses available, it is
desirable to assign the IP addresses to those devices only when they are connected to the main
network. DHCP can be used to accomplish this task; and the DHCP/BOOTP Relay Agent helps
DHCP work over WAN environments.
For more detailed DHCP/BOOTP information, refer to the following specifications:
RFC 1542: Clarifications and Extensions for the Bootstrap Protocol
RFC 1541: Dynamic Host Configuration Protocol
RFC 1534: Interoperation Between DHCP and BOOTP
RFC 1533: DHCP Options and BOOTP Vendor Extensions
DHCP/BOOTP Relay Agent processing is extensively discussed in RFC 1542.
DHCP/BOOTP R
ELAY AGENT ENVIRONMENTS
The following sections describe the different environments in which the DHCP/BOOTP Relay
Agent may be used.
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