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826 CHAPTER 64: FAST FORWARDING COMMANDS
Parameter inbound: Enables or disables fast forwarding only in the inbound direction.
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.
Description Use the
ip fast-forwarding command to enable fast forwarding in the inbound
and/or outbound direction(s).
Use the
undo ip fast-forwarding command 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.
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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