Contents

Fast forwarding commands· 1

display ip fast-forwarding aging-time· 1

display ip fast-forwarding cache· 1

display ip fast-forwarding fragcache· 2

ip fast-forwarding aging-time· 3

ip fast-forwarding enable· 4

ip fast-forwarding load-sharing· 4

reset ip fast-forwarding cache· 5

 

Fast forwarding commands

display ip fast-forwarding aging-time

Use display ip fast-forwarding aging-time to display the aging time of fast forwarding entries.

Syntax

display ip fast-forwarding aging-time

Views

Any view

Predefined user roles

network-admin

network-operator

Examples

# Display the aging time of fast forwarding entries.

<Sysname> display ip fast-forwarding aging-time

 Aging time: 30

Related commands

ip fast-forwarding aging-time

display ip fast-forwarding cache

Use display ip fast-forwarding cache to display fast forwarding entries.

Syntax

display ip fast-forwarding cache [ ip-address ] [ slot slot-number ]

Views

Any view

Predefined user roles

network-admin

network-operator

Parameters

ip-address: Specifies an IP address. If you do not specify an IP address, this command displays all fast forwarding entries.

slot slot-number: Specifies a card by the slot number. If you do not specify a card, this command displays fast forwarding entries for all cards.

Examples

# Display all fast forwarding entries.

<Sysname> display ip fast-forwarding cache

Total number of fast-forwarding entries: 1

SIP            SPort DIP            DPort Pro Input_If   Output_If   Flg

7.0.0.13       68    8.0.0.1        67    17  GE1/0/3    GE1/0/1     5

Table 1 Command output

Field	Description
SIP	Source IP address.
SPort	Source port number.
DIP	Destination IP address.
DPort	Destination port number.
Pro	Protocol number.
Input_If	Input interface type and number. If no interface is involved in fast forwarding, this field displays N/A. If the input interface does not exist, this field displays a hyphen (-).
Output_If	Output interface type and number. If no interface is involved in fast forwarding, this field displays N/A. If the output interface does not exist, this field displays a hyphen (-).
Flg	Internal tag, marking internal operation information, such as fragmentation.

 

Related commands

reset ip fast-forwarding cache

display ip fast-forwarding fragcache

Use display ip fast-forwarding fragcache to display fast forwarding entries for fragmented packets.

Syntax

display ip fast-forwarding fragcache [ ip-address ] [ slot slot-number ]

Views

Any view

Predefined user roles

network-admin

network-operator

Parameters

ip-address: Specifies an IP address. If you do not specify an IP address, this command displays fast forwarding entries for all fragmented packets.

slot slot-number: Specifies a card by the slot number. If you do not specify a card, this command displays fast forwarding entries for fragmented packets on all cards.

Examples

# Display fast forwarding entries about all fragmented packets.

<Sysname> display ip fast-forwarding fragcache

Total number of fragment fast-forwarding entries: 1

SIP             SPort DIP             DPort Pro Input_If    ID

7.0.0.13        68    8.0.0.1         67    17  GE1/0/3     2

Table 2 Command output

Field	Description
SIP	Source IP address.
SPort	Source port number.
DIP	Destination IP address.
DPort	Destination port number.
Pro	Protocol number.
Input_If	Input interface type and number. If no interface is involved in fast forwarding, this field displays N/A. If the input interface does not exist, this field displays a hyphen (-).
ID	Fragment ID.

 

Related commands

reset ip fast-forwarding cache

ip fast-forwarding aging-time

Use ip fast-forwarding aging-time to configure the aging time for fast forwarding entries.

Use undo ip fast-forwarding aging-time to restore the default.

Syntax

ip fast-forwarding aging-time aging-time

undo ip fast-forwarding aging-time

Default

The aging time is 30 seconds.

Views

System view

Predefined user roles

network-admin

Parameters

aging-time: Specifies the aging time in the range of 10 to 300 seconds.

Examples

# Set the aging time to 20 seconds for fast forwarding entries.

<Sysname> system-view

[Sysname] ip fast-forwarding aging-time 20

Related commands

display ip fast-forwarding aging-time

ip fast-forwarding enable

Use ip fast-forwarding enable to enable fast forwarding.

Use undo ip fast-forwarding enable to disable fast forwarding.

Syntax

ip fast-forwarding enable

undo ip fast-forwarding enable

Default

Fast forwarding is enabled.

Views

System view

Predefined user roles

network-admin

Usage guidelines

The fast forwarding feature will create fast forwarding entries for the device to speed up forwarding. A large number of fast forwarding entries will cause high memory usage, which eventually leads to memory allocation failure for other services. In this case, you can disable fast forwarding temporarily to free up the device memory.

Do not disable fast forwarding if the device runs session-based services. Disabling fast forwarding will make these services become ineffective:

·     NAT.

·     ASPF.

·     Attack detection and prevention.

Examples

# Disable fast forwarding.

<Sysname> system-view

[Sysname] undo ip fast-forwarding enable

Related commands

display ip fast-forwarding cache

reset ip fast-forwarding cache

ip fast-forwarding load-sharing

Use ip fast-forwarding load-sharing to enable fast forwarding load sharing.

Use undo ip fast-forwarding load-sharing to disable fast forwarding load sharing.

Syntax

ip fast-forwarding load-sharing

undo ip fast-forwarding load-sharing

Default

Fast forwarding load sharing is enabled.

Views

System view

Predefined user roles

network-admin

Usage guidelines

Fast forwarding load sharing enables the device to load share packets of the same flow. This feature identifies a data flow by using the packet information.

If fast forwarding load sharing is disabled, the device identifies a data flow by the packet information and the input interface. No load sharing is implemented.

Examples

# Enable fast forwarding load sharing.

<Sysname> system-Views

[Sysname] ip fast-forwarding load-sharing

reset ip fast-forwarding cache

Use reset ip fast-forwarding cache to clear the fast forwarding table.

Syntax

reset ip fast-forwarding cache [ slot slot-number ]

Views

User view

Predefined use roles

network-admin

Parameters

slot slot-number: Specifies a card by the slot number. If you do not specify a card, this command clears the fast forwarding table for all cards.

Examples

# Clear the fast forwarding table.

<Sysname> reset ip fast-forwarding cache

Related commands

display ip fast-forwarding cache

display ip fast-forwarding fragcache