826CHAPTER 64: FAST FORWARDING COMMANDS

Parameter inbound: Enables or disables fast forwarding only in the inbound direction.

Description

c

outbound: Enables or disables fast forwarding only in the outbound direction.

If no parameter is specified, fast forwarding is enabled or disabled in both the inbound and outbound directions.

Use the ip fast-forwardingcommand to enable fast forwarding in the inbound and/or outbound direction(s).

Use the undo ip fast-forwardingcommand to disable fast forwarding in the inbound and/or outbound direction(s).

By default, fast forwarding is enabled in both the inbound and outbound directions.

Fast forwarding applies to high speed link interfaces (such as Ethernet and Frame Relay interfaces) rather than low speed link interfaces.

Fast forwarding is supported on high-speed link interfaces (including Ethernet, synchronous PPP, Frame Relay and HDLC interfaces) with firewall, NAT, or GRE configured. Fast forwarding is also supported on PPP MP links and IPHC compression or VJ compression enabled PPP links.

CAUTION:

In the case of load balancing using fast forwarding, fast forwarding must be disabled in the corresponding direction of the interface.

The interface on which fast forwarding is enabled stops sending ICMP Redirect messages.

After fast forwarding is enabled on an interface, no IP packet debugging information will be displayed for the interface, that is, the debugging ip packet command does not work.

To implement fast forwarding of data flow, you need to enable fast forwarding in the inbound direction of the receive interface and in the outbound direction of the send interface.

When a routing interface is different from its physical interface on links such as MP link or PPPoE links, whether fast forwarding is enabled or not on the physical interface does not affect fast forwarding on the routing interface.

Example # Enable fast forwarding in the inbound direction of the Ethernet 1/0 interface.

<Sysname> system-view

[Sysname] interface ethernet 1/0

[Sysname-Ethernet1/0] ip fast-forwarding inbound

# Disable fast forwarding in the inbound direction of the Ethernet 1/1 interface.

<Sysname> system-view

[Sysname] interface ethernet 1/1

[Sysname-Ethernet1/1] undo ip fast-forwarding

Page 826
Image 826
3Com MSR 30, MSR 50 manual Fast Forwarding Commands