Juniper JUNOSE SOFTWARE FOR E SERIES 11.3.X - BROADBAND ACCESS CONFIGURATION GUIDE 2010-10-12 Configuration Manual page 538

JunosE 11.3.x Broadband Access Configuration Guide
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DHCP relay to match DHCP option 60 strings and to specify what action to use for the
traffic.
Use the following guidelines when configuring the set dhcp vendor-option command:
Use the equals or starts-with keywords to specify a unique string to match, and to
configure the action to take for traffic with a matching string:
equals—The DHCP client string is an exact match of the specified string
starts-with—The DHCP client string is a partial match, from left-to-right, of the
specified string. For example, a client string of day matches a starts-with configured
string of daytime.
Use the following keywords to configure actions for matching strings:
local-server—Forward packets to the DHCP local server
relay—Forward packets to the DHCP server with the specified IP address
Use the default keyword to set the default action to take when the option 60 string
does not match a configured vendor-option string. Use the following keywords to
configure actions for nonmatching strings:
drop—Discard traffic
local-server—Forward packets to the DHCP local server
proxy-client—Forward traffic to the DHCP proxy client server
relay—Forward packets to the DHCP server with the specified IP address
relay-server-list—Forward traffic to all non-vendor option DHCP servers. The
relay-server-list consists of all non-vendor option servers. Non-vendor option servers
are those servers that are configured with the set dhcp relay command but not with
the set dhcp vendor-option command.
When you configure the first DHCP vendor-option and no default action is specified
for a configured DHCP application, the router chooses the default action according
to the preference of the DCHP applications. The order of preference from first to last
is DHCP local server, DHCP relay, and DHCP proxy client.
You can map multiple strings to the same DHCP server, and you can map a single string
to multiple servers. However, mapping one string to more than five DHCP vendor-option
servers might impact performance.
You can configure a maximum of 100 option 60 strings per DHCP relay. Strings can
contain a maximum of 254 characters.
Client packets that have option 60 configured but have no string specified (a string of 0
length) are treated as nonmatching strings and handled accordingly.
To configure an exact match:
host1(config)#set dhcp vendor-option equals myword relay 192.168.7.7
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