Command Line Reference Guide

IPv4 Routing | 621
ip fib download-igp-only
e
Configure the E-Series to download only IGP routes (for example, OSPF) on to line cards. When the
command is configured or removed, it clears the routing table (similar to clear ip route command) and
only IGP routes populate the table.
Syntax
ip fib download-igp-only [small-fib]
To return to default setting, use the no ip fib download-igp-only [small-fib] command.
Parameters
Defaults
Disabled
Command Modes
CONFIGURATION
Command
History
ip helper-address
c e s
Specify the address of a DHCP server so that DHCP broadcast messages can be forwarded when the
DHCP server is not on the same subnet as the client.
Syntax
ip helper-address ip-address | default-vrf
To remove a DHCP server address, enter no ip helper-address.
Parameters
Defaults
Not configured.
Command Modes
INTERFACE
Command
History
Usage
Information
You can add multiple DHCP servers by entering the ip helper-address command multiple times. If
multiple servers are defined, an incoming request is sent simultaneously to all configured servers and
the reply is forwarded to the DHCP client.
FTOS uses standard DHCP ports, that is UDP ports 67 (server) and 68 (client) for DHCP relay
services. It listens on port 67 and if it receives a broadcast, the software converts it to unicast, and
forwards to it to the DHCP-server with source port=68 and destination port=67.
The server replies with source port=67, destination port=67 and FTOS forwards to the client with
source port=67, destination port=68.
small-fib
(OPTIONAL) Enter the keyword small-fib to download a smaller FIB table. This option is
useful on line cards with a limited FIB size.
Version 8.1.1.0 Introduced on E-Series ExaScale
Version 7.6.1.0 Added support for S-Series
Version 7.5.1.0 Added support for C-Series
pre-Version 6.2.1.1 Introduced on E-Series
ip-address
Enter an IP address in dotted decimal format (A.B.C.D).
default-vrf
(Optional) E-Series Only: Enter default-vrf for the DHCP server VRF is using.
Version 8.1.1.0 Introduced on E-Series ExaScale
Version 7.9.1.0 Introduced VRF on the E-Series
Version 7.6.1.0 Added support for S-Series
Version 7.5.1.0 Added support for C-Series
pre-Version 6.2.1.1 Introduced on E-Series