Enabling Dhcp Relay; Removing Access Routes From Routing Tables And Nvs - Juniper JUNOSE SOFTWARE FOR E SERIES 11.3.X - BROADBAND ACCESS CONFIGURATION GUIDE 2010-10-12 Configuration Manual

JunosE 11.3.x Broadband Access Configuration Guide

Enabling DHCP Relay

Removing Access Routes from Routing Tables and NVS

492
can add the E Series hostname or the virtual router name to the front of the Agent Circuit
ID suboption (suboption 1) of the DHCP relay agent information option (option 82). See
"Configuring Relay Agent Option 82 Information" on page 502.
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 499.
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
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
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