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

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.

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 status: · 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 ] ]

The following compatibility matrix shows the support of hardware platforms for this command:

Hardware	Command compatibility
NSQM1ADEDFGA0, NSQM1AFC2000GDFGA0, NSQM1FWDFG0, NSQM1FWDFGA1, NSQM1FWDFGB0, NSQM1FWDFGB1, NSQM1FWDFGC0, NSQM1FWDFGC1, NSQM1FWDFGD1, NSQM1NATDFGA0, NSQM1NATDFGB0, NSQM2AFC2000GDFGA0, NSQM2FWDFG0, NSQM1FWEFGA0	Yes
NSQ1FWCEA0, NSQM2ADEDSCA0, NSQM2FWDSCA0, NSQM2IPSDSCB0, NSQM2V6DSCA0	No

‌

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

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.

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

In 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 ]

In 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. (In standalone mode.)

slot slot-number: Specifies an IRF member device by its member ID.

slot slot-number: Specifies an IRF member device by its member ID or a PEX by its virtual slot number.

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

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, 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 link-aggregation hash-mode crc

Use hardware fast-forwarding link-aggregation hash-mode crc to use the CRC Hash algorithm to select a link aggreation member port as the output interface for outgoing traffic.

Use undo hardware fast-forwarding link-aggregation hash-mode crc to restore the default.

Syntax

In standalone mode:

hardware fast-forwarding link-aggregation hash-mode crc slot slot-number cpu cpu-number

undo hardware fast-forwarding link-aggregation hash-mode crc slot slot-number cpu cpu-number

In IRF mode:

hardware fast-forwarding link-aggregation hash-mode crc chassis chassis-number slot slot-number cpu cpu-number

undo hardware fast-forwarding link-aggregation hash-mode crc chassis chassis-number slot slot-number cpu cpu-number

Default

The Exclusive-OR algorithm is used.

Views

System view

Predefined user roles

network-admin

Parameters

slot slot-number: Specifies a card by its slot number. (In 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

The command is supported only for Blade IV security service modules.

Examples

# Use the CRC Hash algorithm to select a link aggreation member port as the output interface for outgoing traffic on slot 3.

<Sysname> system-view

[Sysname] hardware fast-forwarding link-aggregation hash-mode crc slot 3 cpu 1

hardware fast-forwarding link-aggregation hash-mode crc ip-offset

Use hardware fast-forwarding link-aggregation hash-mode crc ip-offset to set the IPv6 address offset for CRC calculation to select an aggreation member port as the output interface for outgoing traffic.

Use undo hardware fast-forwarding link-aggregation hash-mode crc ip-offset to restore the default.

Syntax

In standalone mode:

hardware fast-forwarding link-aggregation hash-mode crc ip-offset offset-vlaue slot slot-number cpu cpu-number

undo hardware fast-forwarding link-aggregation hash-mode crc ip-offset [ offset-vlaue ] slot slot-number cpu cpu-number

In IRF mode:

hardware fast-forwarding link-aggregation hash-mode crc ip-offset offset-vlaue chassis chassis-number slot slot-number cpu cpu-number

undo hardware fast-forwarding link-aggregation hash-mode crc ip-offset [ offset-vlaue ] chassis chassis-number slot slot-number cpu cpu-number

Default

The IPv6 address offset for CRC calculation is 0.

Views

System view

Predefined user roles

network-admin

Parameters

offset-vlaue: Set the IPv6 address offset in bits. The value range for this argument is 0 to 96.

slot slot-number: Specifies a card by its slot number. (In 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

The command is supported only for Blade IV security service modules.

If you use the CRC HASH algorithm for aggreation member port selection, you can set a calculation offset for IPv6 addresses to be calculated by using this command. CRC takes the bit where the offset-vlaue argument specifies and the following 31 bits for calculation.

Examples

# Set the IPv6 address offset for CRC calculation to 10.

<Sysname> system-view

[Sysname] hardware fast-forwarding link-aggregation hash-mode crc ip-offset 10

hardware fast-forwarding standalone

Use hardware fast-forwarding standalone to enable fast forwarding for service request packets with one hardware chip.

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

Service request packets are fast forwarded by dual hardware chips.

Views

System view

Predefined user roles

network-admin

Parameters

slot slot-number: Specifies a card by its slot number. (In 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

Use this command to enable a dual hardware chip module to fast forward service request packets with only one hardware chip as needed. This command takes effect only after you reboot the specified card.

A security engine group can contain multiple engines (service modules). After you shift the traffic processing mode of such a module, you must perform the following tasks for the shift to take effect:

1. Shift the traffic processing mode of other modules in the group to the desired one.

2. Reboot all modules in the group.

For more information about security engine groups, see configuring contexts in Virtual Technologies Configuration Guide.

After you shift the traffic processing mode, only service reply packets are processed by dual hardware chips.

This command is not applicable to single hardware chip modules.

Examples

# Enable fast forwarding for service request packets with one hardware chip on slot 1.

<Sysname> system-view

[Sysname] hardware fast-forwarding standalone slot 1

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

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

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

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

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

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

Fast forwarding commands

display ip fast-forwarding aging-time

display ip fast-forwarding cache

display ip fast-forwarding fragcache

hardware fast-forwarding checksum encap incremental

hardware fast-forwarding checksum inspect action

hardware fast-forwarding checksum inspect enable

hardware fast-forwarding enable

hardware fast-forwarding ifsn match enable

hardware fast-forwarding link-aggregation hash-mode crc

hardware fast-forwarding link-aggregation hash-mode crc ip-offset

hardware fast-forwarding standalone

ip fast-forwarding aging-time

ip fast-forwarding dscp

ip fast-forwarding load-sharing

ip fast-forwarding vxlan-port

reset ip fast-forwarding cache

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