Non-default vSystems do not support some of the fast forwarding commands. For information about vSystem support for a command, see the usage guidelines on that command. For information about vSystem, see Virtual Technologies Configuration Guide.

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

context-admin

context-operator

vsys-admin

vsys-operator

Examples

# Display the aging time of fast forwarding entries.

<Sysname> display ip fast-forwarding aging-time

Aging time: 30s

Related commands

ip fast-forwarding aging-time

display ip fast-forwarding cache

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

Syntax

In standalone mode:

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

In IRF mode:

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

Views

Any view

Predefined user roles

network-admin

network-operator

context-admin

context-operator

vsys-admin

vsys-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. (In standalone mode.)

chassis chassis-number slot slot-number: Specifies a card in an IRF member device. The chassis-number argument represents the member ID of the IRF member device. The slot-number represents the slot number of the card. If you do not specify a card, this command displays fast forwarding entries for all cards.(In IRF mode.)

cpu cpu-number: Specifies a CPU by its number. This option is available only if multiple CPUs are available on the specified slot.

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

In standalone mode:

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

In IRF mode:

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

Views

Any view

Predefined user roles

network-admin

network-operator

context-admin

context-operator

vsys-admin

vsys-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. (In standalone mode.)

chassis chassis-number slot slot-number: Specifies a card on an IRF member device. The chassis-number argument represents the member ID of the IRF member device. The slot-number represents the slot number of the card. If you do not specify a card, this command displays fast forwarding entries for fragmented packets on all cards. (In IRF mode.)

cpu cpu-number: Specifies a CPU by its number. This option is available only if multiple CPUs are available on the specified slot.

Restrictions and guidelines

The system creates fast forwarding entries for fragments only when virtual fragment reassembly (VFR) is enabled. If VFR is disabled, this command does not display fast forwarding entries for fragments.

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 Relay_flag

7.0.0.13 68 8.0.0.1 67 17 GE1/0/3 2 1

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.
Relay_flag	Fragment pass-through flag: · 0—Not pass through. · 1—Pass through.

Related commands

reset ip fast-forwarding cache

hardware fast-forwarding checksum encap incremental

Use hardware fast-forwarding checksum encap incremental to enable the incremental checksum encapsulation for outgoing packets on hardware fast forwarding chips.

Use undo hardware fast-forwarding checksum encap incremental to restore the default.

Syntax

In standalone mode:

hardware fast-forwarding checksum encap incremental [ slot slot-number cpu cpu-number ]

undo hardware fast-forwarding checksum encap incremental [ slot slot-number cpu cpu-number ]

In IRF mode:

hardware fast-forwarding checksum encap incremental [ chassis chassis-number slot slot-number cpu cpu-number ]

undo hardware fast-forwarding checksum encap incremental [ chassis chassis-number slot slot-number cpu cpu-number ]

Default

The incremental checksum is encapsulated into the outgoing packets on hardware fast forwarding chips.

Views

System view

Predefined user roles

network-admin

Parameters

slot slot-number: Specifies a card by its slot number. If you do not specify a card, the command enables incremental checksum encapsulation for outgoing packets on hardware fast forwarding chips of all cards. (In standalone mode.)

chassis chassis-number slot slot-number: Specifies a card on an IRF member device. The chassis-number argument represents the member ID of the IRF member device. The slot-number argument represents the slot number of the card. If you do not specify a card, the command enables incremental checksum encapsulation for outgoing packets on hardware fast forwarding chips of all cards. (In IRF mode.)

cpu cpu-number: Specifies a CPU by its number. This option is available only if multiple CPUs are available on the specified slot.

Usage guidelines

This command takes effect only on service modules that support hardware fast forwarding.

This command is supported only on the default context and is not supported on non-default contexts.

Examples

# Enable the incremental checksum encapsulation for outgoing packets on the hardware fast forwarding chip for CPU 1 on the specified slot.

<Sysname> system-view

[Sysname] hardware fast-forwarding checksum encap incremental chassis 1 slot 1 cpu 1

hardware fast-forwarding checksum inspect action

Use hardware fast-forwarding checksum inspect action { drop-err | log }to specify an action for a packet alteration event.

Use undo hardware fast-forwarding checksum inspect action { drop-err | log } to cancel the specified action.

Syntax

In standalone mode:

hardware fast-forwarding checksum inspect action { drop-err | log } [ slot slot-number cpu cpu-number ]

undo hardware fast-forwarding checksum inspect action { drop-err | log } [ slot slot-number cpu cpu-number ]

In IRF mode:

hardware fast-forwarding checksum inspect action { drop-err | log } [ chassis chassis-number slot slot-number cpu cpu-number ]

undo hardware fast-forwarding checksum inspect action { drop-err | log } [ chassis chassis-number slot slot-number cpu cpu-number ]

Default

When the device detects a packet alteration event, it forwards the altered packet and generates a log message.

Views

System view

Predefined user roles

network-admin

Parameters

drop-err: Drops the altered packets.

log: Generates a log message when the device detects a packet alteration event.

slot slot-number: Specifies a card by its slot number. If you do not specify a card, the command configuration applies to all cards. (In standalone mode.)

chassis chassis-number slot slot-number: Specifies a card on an IRF member device. The chassis-number argument represents the member ID of the IRF member device. The slot-number argument represents the slot number of the card. If you do not specify a card, the command configuration applies to all cards. (In IRF mode.)

cpu cpu-number: Specifies a CPU by its number. This option is available only if multiple CPUs are available on the specified slot.

Usage guidelines

This command takes effect only on service modules that support hardware fast forwarding.

This command is supported only on the default context and is not supported on non-default contexts.

If you execute this command multiple times, the specified action in each execution takes effect.

Examples

# Disable logging for packet alteration for CPU 1 on the specified slot.

<Sysname> system-view

[Sysname] undo hardware fast-forwarding checksum inspect action log chassis 1 slot 1 cpu 1

Related commands

hardware fast-forwarding checksum inspect enable

Use hardware fast-forwarding checksum inspect enable to enable alteration detection for outgoing packets on hardware fast forwarding chips.

Use undo hardware fast-forwarding checksum inspect enable to disable alteration detection for outgoing packets on hardware fast forwarding chips.

Syntax

In standalone mode:

hardware fast-forwarding checksum inspect [ l3 | l4 [ tcp | udp ] ] enable [ slot slot-number cpu cpu-number ]

undo hardware fast-forwarding checksum inspect [ l3 | l4 [ tcp | udp ] ] enable [ slot slot-number cpu cpu-number ]

In IRF mode:

hardware fast-forwarding checksum inspect [ l3 | l4 [ tcp | udp ] ] enable [ chassis chassis-number slot slot-number cpu cpu-number ]

undo hardware fast-forwarding checksum inspect [ l3 | l4 [ tcp | udp ] ] enable [ chassis chassis-number slot slot-number cpu cpu-number ]

Default

Alteration detection is enabled for outgoing packets on hardware fast forwarding chips.

Views

System view

Predefined user roles

network-admin

Parameters

l3: Enables the packet alteration detection on the Layer 3 information.

l4: Enables the packet alteration detection on the Layer 4 information.

tcp: Enables the TCP packet alteration detection.

udp: Enables the UDP packet alteration detection.

slot slot-number: Specifies a card by its slot number. If you do not specify a card, the command enables alteration detection for outgoing packets on hardware fast forwarding chips of all cards. (In standalone mode.)

chassis chassis-number slot slot-number: Specifies a card on an IRF member device. The chassis-number argument represents the member ID of the IRF member device. The slot-number argument represents the slot number of the card. If you do not specify a card, the command enables alteration detection for outgoing packets on hardware fast forwarding chips of all cards. (In IRF mode.)

cpu cpu-number: Specifies a CPU by its number. This option is available only if multiple CPUs are available on the specified slot.

Usage guidelines

This command takes effect only on service modules that support hardware fast forwarding.

To enable alteration detection on different types of packets, execute this command multiple times.

To enable TCP or UDP packet alteration detection, specify the l4 keyword before you specify the tcp or udp keyword.

If you do not specify any parameters, the device detects alterations for outgoing packets on both the Layer 3 and Layer 4 information.

If you specify the l4 keyword without specifying the tcp or udp keyword, the device detects alterations for outgoing packets on the Layer 4 information.

This command is supported only on the default context and is not supported on non-default contexts.

Examples

# Disable alteration detection on outgoing TCP packets for CPU 1 on slot 1 chassis 1.

<Sysname> system-view

[Sysname] undo hardware fast-forwarding checksum inspect l4 tcp enable chassis 1 slot 1 cpu 1

hardware fast-forwarding enable

Use hardware fast-forwarding enable to enable hardware fast forwarding.

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

Syntax

In standalone mode:

hardware fast-forwarding enable [ slot slot-number [ cpu cpu-number ] ]

undo hardware fast-forwarding enable [ slot slot-number [ cpu cpu-number ] ]

In IRF mode:

hardware fast-forwarding enable [ chassis chassis-number slot slot-number [ cpu cpu-number ] ]

undo hardware fast-forwarding enable [ chassis chassis-number slot slot-number [ cpu cpu-number ] ]

Default

Hardware fast forwarding is enabled.

Views

System view

Predefined user roles

network-admin

Parameters

slot slot-number: Specifies a card by the slot number. If you do not specify a card, this command enables hardware fast forwarding for all cards. (In standalone mode.)

chassis chassis-number slot slot-number: Specifies a card on an IRF member device. The chassis-number argument represents the member ID of the IRF member device. The slot-number represents the slot number of the card. If you do not specify a card, this command enables hardware fast forwarding for all cards. (In IRF mode.)

cpu cpu-number: Specifies a CPU by its number. This option is available only if multiple CPUs are available on the specified slot.

Usage guidelines

Non-default vSystems do not support this command.

Hardware fast forwarding stores session information during fast forwarding to speed up subsequent traffic forwarding by comparing the traffic with session information.

Disable hardware fast forward when you troubleshoot problems on forwarding chips.

Non-default context does not support this command.

Examples

# Disable hardware fast forwarding on slot 1.

<Sysname> system-view

[Sysname] undo hardware fast-forwarding enable slot 1

hardware fast-forwarding ifsn match enable

Use hardware fast-forwarding ifsn match enable to i gnore interface sequence numbers during hardware fast forwarding.

Use undo hardware fast-forwarding ifsn match enable to disable ignoring interface sequence numbers during hardware fast forwarding.

Syntax

Standalone mode:

hardware fast-forwarding ifsn match enable [ slot slot-number cpu cpu-number ]

undo hardware fast-forwarding ifsn match enable [ slot slot-number cpu cpu-number ]

IRF mode:

hardware fast-forwarding ifsn match enable [ chassis chassis-number slot slot-number cpu cpu-number ]

undo hardware fast-forwarding ifsn match enable [ chassis chassis-number slot slot-number cpu cpu-number ]

Default

T he device does not ignore interface sequence numbers during hardware fast forwarding.

Views

System view

Predefined user roles

network-admin

Parameters

slot slot-number: Specifies a card by the slot number. (Standalone mode.)

cpu cpu-number: Specifies a CPU by its number. This option is available only if multiple CPUs are available on the specified slot.

Usage guidelines

On a network that has two equal-cost egresses, the device might receive the return packets of a forward flow on different interfaces. By default, the device determines that the return packets are in different traffic flows, because their incoming interfaces are different. As a result, the device cannot implement hardware fast forwarding for the return packets in a different flow.

To resolve this issue, use this command to enable the device to ignore interface sequence numbers during hardware fast forwarding. The device can perform hardware fast forwarding for the return packets of a forward flow even if they are received on different interfaces.

If a forwarding error occurs, you can disable this feature for debugging.

This feature takes effect only after you enable hardware fast forwarding.

Examples

# Ignore interface sequence numbers during hardware fast forwarding.

<Sysname> system-view

[Sysname] hardware fast-forwarding ifsn match enable chassis 1 slot 7 cpu 1

Related commands

hardware fast-forwarding enable

hardware fast-forwarding standalone

Use hardware fast-forwarding standalone to enable single-chip hardware forwarding for upstream packets.

Use undo hardware fast-forwarding standalone to restore the default.

Syntax

In standalone mode:

hardware fast-forwarding standalone [ slot slot-number [ cpu cpu-number ] ]

undo hardware fast-forwarding standalone [ slot slot-number [ cpu cpu-number ] ]

In IRF mode:

hardware fast-forwarding standalone [ chassis chassis-number slot slot-number [ cpu cpu-number ] ]

undo hardware fast-forwarding standalone [ chassis chassis-number slot slot-number [ cpu cpu-number ] ]

Default

Dual-chip hardware forwarding is enabled for upstream packets.

Views

System view

Predefined user roles

network-admin

Parameters

slot slot-number: Specifies a card by the slot number. (In standalone mode.)

chassis chassis-number slot slot-number: Specifies a card on an IRF member device or specifies a PEX. The chassis-number argument represents the member ID of the IRF member device or the virtual chassis number of the PEX. The slot-number represents the slot number of the card or PEX. (In IRF mode.)

cpu cpu-number: Specifies a CPU by its number. This option is available only if multiple CPUs are available on the specified slot.

Usage guidelines

This feature applies only to modules that have more than one hardware forwarding chip.

It enables a dual-chip module to forward upstream packets by using only one of the chips. This feature does not apply to downstream packets. The module uses both chips to forward downstream packets.

After you change the hardware forwarding mode for upstream packets, you must restart the module for the change to take effect.

To change the hardware forwarding mode for upstream packets in a security engine group with multiple security engines (multiple modules), perform the following tasks:

· Execute the hardware fast-forwarding standalone or undo hardware fast-forwarding standalone command on all modules one by one to change their hardware forwarding mode for upstream packets.

· Restart all modules.

For details about security engine group, see context configuration in Virtual Technologies Configuration Guide.

Examples

# Enable single-chip hardware forwarding for upstream packets on slot 1.

<Sysname> system-view

[Sysname] hardware fast-forwarding standalone slot 1

hardware processing-mode attack-resistance

Use hardware processing-mode attack-resistance to s et the packet processing mode to attack-resistance for security modules.

Use undo hardware processing-mode attack-resistance to restore the default.

Syntax

hardware processing-mode attack-resistance

undo hardware processing-mode attack-resistance

Default

Security modules use the CPU for packet processing.

Views

System view

Predefined user roles

network-admin

Usage guidelines

This command is applicable only to Blade IV security modules.

When a CPU core on the security module processes too many packets in a short time, the performance of other CPU cores might be degraded. To resolve this issue, use this command to enable the security module to process packets in attack-resistance mode. The security module will prefer using FPGA for packet processing.

Examples

# Set the packet processing mode to attack-resistance on security modules

<Sysname> system-view

[Sysname] hardware processing-mode attack-resistance

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

context-admin

vsys-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 dscp

Use ip fast-forwarding dscp to enable DSCP-based fast forwarding for GRE and VXLAN packets.

Use undo ip fast-forwarding dscp to restore the default.

Syntax

ip fast-forwarding dscp

undo ip fast-forwarding dscp

Default

DSCP-based fast forwarding for GRE and VXLAN packets is disabled.

Views

System view

Predefined user roles

network-admin

context-admin

vsys-admin

Usage guidelines

This command is applicable to GRE packets (with IP as the passenger protocol) and VXLAN packets that are processed by software.

This feature uses the DSCP value in the outer header instead of the source port number among the identification criteria to identify GRE and VXLAN traffic flows.

This command is mutually exclusive with NAT and load balancing.

Examples

# Enable DSCP-based GRE and VXLAN packet fast forwarding.

<Sysname> system-view

[Sysname] ip fast-forwarding dscp

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

context-admin

vsys-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

ip fast-forwarding vxlan-port

Use ip fast-forwarding vxlan-port to specify the destination UDP port number for identifying VXLAN packets.

Use undo ip fast-forwarding vxlan-port to restore the default.

Syntax

ip fast-forwarding vxlan-port port-number

undo ip fast-forwarding vxlan-port

Default

The destination UDP port number is 4789.

Views

System view

Predefined use roles

network-admin

context-admin

vsys-admin

Parameters

port-number: Specifies a UDP port number in the range of 1 to 65535.

Usage guidelines

This feature is applicable to only the UDP packets that are processed by software.

In a VXLAN network, configure this command on intermediate devices to identify VXLAN packets.

Examples

# Specify the destination UDP port number to 4900 for identifying VXLAN packets.

<Sysname> system-view

[Sysname] ip fast-forwarding vxlan-port 4900

reset ip fast-forwarding cache

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

Syntax

In standalone mode:

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

In IRF mode:

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

Views

User view

Predefined use roles

network-admin

context-admin

vsys-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. (In standalone mode.)

chassis chassis-number slot slot-number: Specifies a card on an IRF member device. The chassis-number argument represents the member ID of the IRF member device. The slot-number argument represents the slot number of the card. If you do not specify a card, this command clears the fast forwarding table for all cards. (In IRF mode.)

cpu cpu-number: Specifies a CPU by its number. This option is available only if multiple CPUs are available on the specified slot.

Examples

# Clear the fast forwarding table.

<Sysname> reset ip fast-forwarding cache

Related commands

display ip fast-forwarding cache

display ip fast-forwarding fragcache

11-Layer 3—IP Services Command Reference

display ip fast-forwarding fragcache

Restrictions and guidelines

hardware fast-forwarding checksum inspect action

hardware processing-mode attack-resistance

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