Enterasys Networks CSX7000 Manuel d'utilisateur télécharger pdf (Page 316)

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USER’S GUIDE

316 CyberSWITCH

DHCP CONFIGURATION ELEMENTS

DHCP PROXY CLIENT ENABLE/DISABLE FLAG

A global flag that indicates whether the DHCP Proxy Client feature is enabled or not. The proxy

client is disabled by default.

AXIMUM NUMBER OF IP ADDRESSES

Refers to the maximum number of IP addresses obtained from DHCP servers for this network

interface. This number of IP addresses can be leased from DHCP servers for this interface and

placed into the IP Address Pool. The range of this configuration value is 0 to “x” where “x” is the

size of the Address Pool. The default for this value is 0.

Note: If all available entries in the IP Address Pool are assigned to one IP network interfaces’s

maximum, there will not be any more available for other interfaces. Therefore, take care to

plan accordingly.

UMBER OF IP ADDRESSES TO PRE-FETCH

The configured number of IP addresses to have available at all times for an IP network interface.

This means that the IP addresses have been placed in the IP Address Pool, but have not yet been

leased to any remote devices. These IP addresses are sitting in the IP Address Pool waiting to be

claimed by remote devices. The range of this configuration value is 0 to “x” where “x” is the

maximum IP addresses to obtain for the IP network interface. The default for this value is 0.

LAN P

ORT ON WHICH TO REACH THE DHCP SERVER

This configuration value contains the number of the LAN port to use in order to reach a DHCP

server. The range of this value is 1 to “x” where “x” is the number of configured LAN ports. The

default for this value is 1.

DHCP BACKGROUND INFORMATION

The DHCP Proxy Client feature enables the CyberSWITCH to dynamically obtain IP addresses

from a DHCP server for IP host devices that support PPP. This feature compliments the DHCP

Relay Agent feature, which supports remote bridges. Both features together allow the

CyberSWITCH to access the DHCP server to allocate IP addresses to all types of remote IP devices,

rather than maintaining separate IP address pools for separate devices.

Remote IP devices that use PPP to connect to the CyberSWITCH use PPP IPCP IP Address

negotiation to dynamically obtain their IP addresses. In general, those devices are not capable of

using DHCP to obtain the dynamic IP addresses. However, with the DCHP Proxy Client feature,

the CyberSWITCH “pretends” to be a DHCP client. When a connection is established and a remote

IP host device requests an IP address, the CyberSWITCH (acting as a DHCP client) obtains an IP

address from the DHCP server. It then gives it to the remote device via IPCP.

The CyberSWITCH is capable of prefetching some number of IP addresses so that connections can

be established faster. You may configure two numbers for each WAN type network interface: the

number of the IP addresses to prefetch (“x”), and the maximum number of IP addresses to obtain

(“y”). The CyberSWITCH will prefetch “x” IP addresses for the network interface until it has

obtained “y” addresses. For example, if the number to prefetch is 3, and the maximum number is

5, then 3 IP addresses will be prefetched immediately. As one IP address is assigned to a remote

device, one IP address is obtained from a DHCP server until the total of 5 IP addresses have been

obtained.

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Enterasys Networks CSX7000 Manuel d'utilisateur Page 316

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