Cyclades AlterPath BladeManager Manuel d'instructions télécharger pdf (Page 43)

Chapter 4: Administration Introduction 29

DHCP server

A DHCP server (dhcpd) is present but disabled on the SP manager by default. The administrator

may want to enable the DHCP server to provide fixed IP addresses for connected target devices that

are running DHCP client software. The fixed IP addresses use the following DHCP features:

• Persistent leases, which allow the target device on the private side of the SP manager to keep

the same IP address even after the SP manager or the target device is rebooted.

• Persistent storage of lease information, with the leases file and the dhcpd configuration files

stored in the Flash memory and available to be optionally updated from time to time when

dhcpd is enabled.

• Preconfigured leases: using the MAC address of the target device, the administrator can assign

an IP address to a client before the SP manager sees the target device on the network.

NOTE: IP addresses assigned to connected target devices must remain constant over time because each target

device is assigned an IP address as part of its configuration on the SP manager. For that reason, a DHCP server

should not be used to provide dynamic IP addresses to target devices.

The ability of DHCP to supply fixed addresses can be used to implement the addressing scheme for

target devices, which is described in Preparing an addressing scheme on page 46.

The administrator can enable the DHCP server and assign IP addresses to target devices by logging

into the command line as root and manually editing the /etc/dhcpd.conf file and performing other

steps described under Configuring the DHCP Server on page 120. Before deciding whether to use

the DHCP server to configure addresses for target device, the administrator should understand the

available options for assigning IP addresses to target devices, which are described in Address

configuration for target devices on page 180.

SNMP on the MergePoint 5224/5240 SP Manager

The administrator can activate Simple Network Management Protocol (SNMP) agent software that

resides on the SP manager. The SNMP agent provides access to the SP manager by an SNMP

management application, such as HP Openview, Novell NMS, IBM NetView or Sun Net Manager

and provides proxied access to SNMP data from connected SPs that implement SNMP agents. The

SNMP agent can be configured to send notifications (also known as traps) about significant events

on the SP manager and on target devices.

The administrator must configure the SNMP agent to use the version of SNMP supported by the

management application, either SNMP v1, v2c and v3. The use of v3 is strongly encouraged

wherever possible because it provides authentication and encryption of data that is lacking in v1

and v2c.

Access to information provided by the SP manager and its proxied target devices can be obtained in

either of the two following ways:

• The recommended access method for agents which support only SNMP version 1 or 2c is

through a VPN tunnel to the MergePoint 5224/5240 SP manager. The SP manager provides the

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Cyclades AlterPath BladeManager Manuel d'instructions Page 43