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- Table of Contents
-
- 04-Layer 3—IP Services Configuration Guide
- 00-Preface
- 01-ARP configuration
- 02-IP addressing configuration
- 03-DHCP configuration
- 04-DNS configuration
- 05-IP forwarding basics configuration
- 06-Fast forwarding configuration
- 07-Adjacency table configuration
- 08-IRDP configuration
- 09-IP performance optimization configuration
- 10-UDP Helper configuration
- 11-IPv6 basics configuration
- 12-DHCPv6 configuration
- 13-IPv6 fast forwarding configuration
- 14-Tunneling configuration
- 15-GRE configuration
- 16-HTTP redirect configuration
- Related Documents
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| Title | Size | Download |
|---|---|---|
| 06-Fast forwarding configuration | 40.36 KB |
Configuring the aging time for fast forwarding entries
Configuring fast forwarding load sharing
Displaying and maintaining fast forwarding
Configuring fast forwarding
Overview
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 IP address, source port number, destination IP address, destination port number, and 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.
Fast forwarding can process fragmented IP packets, but it does not fragment IP packets.
Configuring the aging time for fast forwarding entries
The 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.
To configure the aging time for fast forwarding entries:
|
Step |
Command |
Remarks |
|
1. Enter system view. |
system-view |
N/A |
|
2. Configure the aging time for fast forwarding entries. |
ip fast-forwarding aging-time aging-time |
By default, the aging time is 30 seconds. |
Configuring fast forwarding load sharing
Fast forwarding load sharing enables the device to load share packets of the same flow. This feature identifies a data flow by using the five-tuple (source IP, source port, destination IP, destination port, and protocol).
If fast forwarding load sharing is disabled, the device identifies a data flow by the five-tuple and the input interface. No load sharing is implemented.
To configure fast forwarding load sharing:
|
Step |
Command |
Remarks |
|
1. Enter system view. |
system-view |
N/A |
|
2. Enable fast forwarding load sharing. |
ip fast-forwarding load-sharing |
By default, fast forwarding load sharing is enabled. |
Displaying and maintaining fast forwarding
Execute display commands in any view and reset commands in user view.
|
Task |
Command |
|
Display fast forwarding entries. |
display ip fast-forwarding cache [ ip-address ] [ slot slot-number ] |
|
Display fast forwarding entries about fragmented packets. |
display ip fast-forwarding fragcache [ ip-address ] [ slot slot-number ] |
|
Display the aging time of fast forwarding entries. |
display ip fast-forwarding aging-time |
|
Clear the fast forwarding table. |
reset ip fast-forwarding cache [ slot slot-number ] |
