Juniper JUNOSE 11.0.X MULTICAST ROUTING, Configuration Manual

Page: 530 / 788

Enabling DHCP Relay
You use the set dhcp relay command to create and enable DHCP relay in the current
virtual router.
■
Include the IP address variable to enable DHCP relay and BOOTP relay and to
specify an IP address for the DHCP server. When you include the IP address of
a DHCP server, the router adds the IP address to the list of DHCP servers (up to
five) and forwards all request packets to all configured servers.
Issuing this command also enables relay of BOOTP requests to the configured
DHCP servers. If one of the DHCP servers is also a BOOTP server and responds,
the router relays the response to the request originator.
host1(config)# set dhcp relay 192.168.29.10
■
Use the no version with an IP address to remove the specified DHCP server:
host1(config)# no set dhcp relay 192.168.29.25
■
Use this command without an IP address to create the DHCP relay independent
of any DHCP servers. Use this version of the command when configuring support
for DHCP vendor-option strings (option 60). For information about configuring
option 60 support, see “Using Option 60 Strings to Forward Client Traffic to
Specific DHCP Servers” on page 497.
host1(config)# set dhcp relay
■
Use the no version without specifying an IP address to explicitly delete the DHCP
relay from the current virtual router.
host1(config)# no set dhcp relay
Removing Access Routes from Routing Tables and NVS
You can remove existing access routes for an interface from routing tables and
nonvolatile storage (NVS).
This command removes all installed host routes from IP and deletes host routes from
mirrored storage and NVS for specified interfaces. In relay proxy mode, this command
enforces consistent state of the route and client database and discards all client
information for specified interfaces.
Because DHCP relay cannot distinguish between temporary dynamic interface
deletions—where the interface is subsequently re-created—and permanent deletions,
sometimes it retains routing information for dynamic interfaces that have already
been deleted. You can use the
unknown keyword with the dhcp relay discard
access-routes command to remove the routing information for these interfaces.
■
To remove access routes:
host1(config)# set dhcp relay discard-access-routes
490 ■
Configuring DHCP Relay and BOOTP Relay
JUNOSe 11.0.x Broadband Access Configuration Guide