Bootp/Dhcp Client Ip Address Services; Dhcp Host Name Configuration - Lenovo RackSwitch G8264 Application Manual

BOOTP/DHCP Client IP Address Services

DHCP Host Name Configuration

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G8264 Application Guide for ENOS 8.4
For remote switch administration, the client terminal device must have a valid IP
address on the same network as a switch interface. The IP address on the client
device may be configured manually, or obtained automatically using IPv6 stateless
address configuration, or an IPv4 address may obtained automatically via BOOTP
or DHCP relay as discussed in the next section.
The G8264 can function as a relay agent for Bootstrap Protocol (BOOTP) or DHCP.
This allows clients to be assigned an IPv4 address for a finite lease period,
reassigning freed addresses later to other clients.
Acting as a relay agent, the switch can forward a client's IPv4 address request to up
to five BOOTP/DHCP servers. In addition to the five global BOOTP/DHCP servers,
up to five domain‐specific BOOTP/DHCP servers can be configured for each of up
to 10 VLANs.
When a switch receives a BOOTP/DHCP request from a client seeking an IPv4
address, the switch acts as a proxy for the client. The request is forwarded as a UDP
Unicast MAC layer message to the BOOTP/DHCP servers configured for the
client's VLAN, or to the global BOOTP/DHCP servers if no domain‐specific
BOOTP/DHCP servers are configured for the client's VLAN. The servers respond
to the switch with a Unicast reply that contains the IPv4 default gateway and the
IPv4 address for the client. The switch then forwards this reply back to the client.
DHCP is described in RFC 2131, and the DHCP relay agent supported on the
G8264 is described in RFC 1542. DHCP uses UDP as its transport protocol. The
client sends messages to the server on port 67 and the server sends messages to the
client on port 68.
BOOTP and DHCP relay are collectively configured using the BOOTP commands
and menus on the G8264.
The G8264 supports DHCP host name configuration as described in RFC 2132,
option 12. DHCP host name configuration is enabled by default.
Host name can be manually configured using the following command:
RS G8264(config)# hostname <name>
If the host name is manually configured, the switch does not replace it with the
host name received from the DHCP server.
After the host name is configured on the switch, if DHCP or DHCP host name
configuration is disabled, the switch retains the host name.
The switch prompt displays the host name.
Host name configuration can be enabled or disabled using the following
command:
RS G8264(config)# [no] system dhcp hostname