Command Reference Guide

3Com Router 3000 Ethernet Family
Command Reference Guide Chapter 10
3Com Corporation
10-24
Example
# Enable the sending of ICMP Redirect messages.
[Router] icmp redirect send
10.1.22 ip fast-forwarding
Syntax
ip fast-forwarding [ inbound | outbound ]
undo ip fast-forwarding
View
Interface view
Parameter
inbound: Allows unicast fast forwarding only on the inbound interface.
outbound: Allows unicast fast forwarding only on the outbound interface.
Description
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.
By default, unicast fast forwarding is allowed on both inbound and outbound interfaces.
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.
Example
# Disable unicast fast forwarding on an interface.
[3Com-Ethernet/0/0] undo ip fast-forwarding