Contents

Configuring IPv6 fast forwarding· 1

About IPv6 fast forwarding· 1

Enabling/disabling IPv6 fast forwarding· 1

Configuring the aging time for IPv6 fast forwarding entries· 2

Configuring IPv6 fast forwarding load sharing· 2

Verifying and maintaining IPv6 fast forwarding· 2

Verifying the aging time of IPv6 fast forwarding entries· 2

Displaying and clearing IPv6 fast forwarding entries· 2

Configuring IPv6 fast forwarding

About IPv6 fast forwarding

Fast forwarding reduces route lookup time and improves packet forwarding efficiency by using a high-speed cache and data-flow-based technology. It identifies a data flow by using the following fields:

·     Source IPv6 address.

·     Destination IPv6 address.

·     Source port number.

·     Destination port number.

·     Protocol number.

After a flow's first packet is forwarded through the routing table, fast forwarding creates an entry and uses the entry to forward subsequent packets of the flow.

Enabling/disabling IPv6 fast forwarding

About this task

By default, IPv6 fast forwarding is enabled. The device will generate a large number of IPv6 fast forwarding entries when the traffic volume is high. Excessive 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 release the device memory.

Restrictions and guidelines

Do not disable IPv6 fast forwarding if the device runs session-based services. Disabling IPv6 fast forwarding will make these services become ineffective:

·     NAT.

·     ASPF.

·     Attack detection and prevention.

Procedure

1.     Enter system view.

system-view

2.     Configure IPv6 fast forwarding.

¡     Enable IPv6 fast forwarding.

ipv6 fast-forwarding enable

¡     Disable IPv6 fast forwarding.

undo ipv6 fast-forwarding enable

By default, IPv6 fast forwarding is enabled.

Configuring the aging time for IPv6 fast forwarding entries

About this task

The IPv6 fast forwarding table uses an aging timer for each forwarding entry. If an entry is not updated before the timer expires, the device deletes the entry. If an entry has a hit within the aging time, the aging timer restarts.

Procedure

1.     Enter system view.

system-view

2.     Set the aging time for IPv6 fast forwarding entries.

ipv6 fast-forwarding aging-time aging-time

By default, the aging time is 30 seconds.

Configuring IPv6 fast forwarding load sharing

About this task

IPv6 fast forwarding load sharing enables the device to identify a data flow by using the packet information.

If IPv6 fast forwarding load sharing is disabled, the device identifies a data flow by the packet information and the input interface.

Procedure

1.     Enter system view.

system-view

2.     Configure IPv6 fast forwarding load sharing. Choose one option as needed:

¡     Enable IPv6 fast forwarding load sharing.

Ipv6 fast-forwarding load-sharing

¡     Disable IPv6 fast forwarding load sharing.

undo ipv6 fast-forwarding load-sharing

By default, IPv6 fast forwarding load sharing is enabled.

Verifying and maintaining IPv6 fast forwarding

Verifying the aging time of IPv6 fast forwarding entries

To display the aging time of IPv6 fast forwarding entries, execute the following command in any view:

display ipv6 fast-forwarding aging-time

Displaying and clearing IPv6 fast forwarding entries

To display IPv6 fast forwarding entries, execute the following command in any view:

display ipv6 fast-forwarding cache [ ipv6-address ] [ slot slot-number ]

To clear IPv6 fast forwarding entries, execute the following command in user view:

reset ipv6 fast-forwarding cache [ slot slot-number ]