3Com 10014299 manual Forwarding, Display and Debug IP address

Display and Debug IP Performance 363

Disable fast-forwarding on the interface

undo ip fast-forwarding

By default, fast-forwarding is enabled in the input/output directions of the interface.

When fast-forwarding is carried out on an interface, note that:

■You can disable fast-forwarding as necessary. For example, if load sharing is required, fast-forwarding must be disabled in the forwarding direction of the interface.

■If fast-forwarding has been configured on an interface, the interface will not send any ICMP redirected packets.

2 Configure fast-forwarding table size

Table 396 Perform the following configuration in system view

Operation	Command
Configure a fast-forwarding table size	ip fast-forwarding cache-size { 4k
	16k	64k 256k 1m}
Restore the default fast-forwarding table	undo ip	fast-forwarding cache-size
size

The fast-forwarding table size on a router defaults to 4K, that is, up to 4K entries are allowed in the table.

Fast-forwarding table size depends on the memory capacity. The larger the memory capacity is, the larger the configurable fast-forwarding table size will be.

Display and Debug Fast Table 397 Display and Debug fast forwarding

Forwarding
	Operation	Command
	Display IP fast-forwarding cache	display ip fast-forwarding cache
	Display IP fast-forwarding flow-control	display ip fast-forwarding
	Information	flow-control
	Clear contents in the fast forwarding cache	reset ip fast-forwarding cache

When fast-forwarding on the same interface is configured, ICMP redirect messages will not be sent again when IP messages pass the same interface. Otherwise, ICMP reorientation messages needs to be sent while messages are forwarded.

Display and Debug IP	Table 398 Display and Debug IP address
Performance
		Operation	Command
		Display TCP connection status	display tcp status
		Display interface table information	display ip interface [ type
			number ]
		Display IP traffic and statistical information.	display ip statistics
		Turn on IP debugging information	debugging ip packet
		Turn on TCP debugging information	debugging tcp packet
		Turn on TCP cession debugging information	debugging tcp [ event packet ]
		Turn on UDP debugging information	debugging udp packet
		Clear IP statistical information.	reset ip counters