HPE FlexNetwork 5130 EI Series Layer 3-Ip Services Configuration Guide

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By default, the DHCP relay agent uses the polling algorithm. It forwards DHCP requests to all DHCP
servers. The DHCP clients select the DHCP server from which the first received DHCP reply comes.
If the DHCP relay agent uses the master-backup algorithm, it forwards DHCP requests to the
master DHCP server first. If the master DHCP server is not available, the relay agent forwards the
subsequent DHCP requests to a backup DHCP server. If the backup DHCP server is not available,
the relay agent selects the next backup DHCP server, and so on. If no backup DHCP server is
available, it repeats the process starting from the master DHCP server.
The master DHCP server is determined in one of the following ways:
• In a common network where multiple DHCP server addresses are specified on the DHCP relay
interface, the first specified DHCP server is the master. The other DHCP servers are backup.
• In a network where DHCP address pools are configured on the DHCP relay agent, the first
specified DHCP server in a DHCP address pool is the master. The other DHCP servers in the
DHCP address pool are backup.
DHCP server selection supports the following functions:
• DHCP server response timeout time—The DHCP relay agent determines that a DHCP
server is not available if it does not receive any response from the server within the DHCP
server response timeout time. The DHCP server response timeout time is configurable and the
default is 30 seconds.
• DHCP server switchback—If the DHCP relay agent selects a backup DHCP server, it does not
switch back to the master DHCP server by default. You can configure the DHCP relay agent to
switch back to the master DHCP server after a delay. If the master DHCP server is available,
the DHCP relay agent forwards DHCP requests to the master DHCP server. If the master
DHCP server is not available, the DHCP relay agent still uses the backup DHCP server.
Specifying the DHCP server selecting algorithm in interface view
1. Enter system view.
system-view
2. Enter interface view.
interface interface-type interface-number
3. Specify the DHCP server selecting algorithm.
dhcp relay server-address algorithm { master-backup | polling }
By default, the polling algorithm is used. The DHCP relay agent forwards DHCP requests to
all DHCP servers.
4. (Optional.) Set the DHCP server response timeout time for DHCP server switchover.
dhcp relay dhcp-server timeout time
By default, the DHCP server response timeout time is 30 seconds.
5. (Optional.) Enable the switchback to the master DHCP server and set the delay time.
dhcp relay master-server switch-delay delay-time
By default, the DHCP relay agent does not switch back to the master DHCP server.
Specifying the DHCP server selecting algorithm in DHCP address pool view
1. Enter system view.
system-view
2. Enter DHCP address pool view.
dhcp server ip-pool pool-name
3. Specify the DHCP server selecting algorithm.
dhcp relay server-address algorithm { master-backup | polling }
By default, the polling algorithm is used. The DHCP relay agent forwards DHCP requests to
all DHCP servers.

HPE FlexNetwork 5130 EI Series Specifications

General

Brand	HPE
Model	FlexNetwork 5130 EI Series
Category	Switch
Language	English