Command Reference Guide

186 ● ip fast-forwarding 3Com Router 5000 Family and Router 6000 Family
Command Reference
ip fast-forwarding
Purpose Use the ip fast-forwarding command to enable unicast fast packet forwarding
on both inbound and outbound interfaces.
Use the
ip fast-forwarding inbound command to enable unicast fast packet
forwarding on the inbound interface.
Use the
ip fast-forwarding outbound command to enable unicast fast packet
forwarding on the outbound interface.
Use the undo ip fast-forwarding command to disable unicast fast forwarding
on both the inbound and outbound interfaces.
Syntax ip fast-forwarding [ inbound | outbound ]
undo ip fast-forwarding
Parameters inbound
Allows unicast fast forwarding only on the inbound
interface.
outbound
Allows unicast fast forwarding only on the outbound
interface.
Default By default, unicast fast forwarding is allowed on both inbound and outbound
interfaces.
Example Disable unicast fast forwarding on an interface.
[3Com-Ethernet/0/0] undo ip fast-forwarding
# Enable unicast fast forwarding on the inbound interface on Ethernet
0/0/0.
[3Com-Ethernet0/0/0] ip fast-forwarding inbound
View This command can be used in the following views:
■ Interface view
Description Unicast fast forwarding is well-suited to high-speed links (such as Ethernet and FR). Its
function will be render useless, however, on a low-speed link, due to the low
transmission rate such a link can provide.
3Com Series Routers support unicast fast forwarding on the links of various
high-speed interfaces such as Ethernet, synchronous PPP, FR, and HDLC, on the
interfaces configured with firewall and NAT features, and on the virtual tunnel
interface of GRE as well. However, it should be noted that the interface configured
with the function of unicast fast forwarding will be unable to send ICMP redirection
packets.