R2511-HP MSR Router Series Layer 3 - IP Services Configuration Guide(V5)

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Configuring IPv6 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 uses a five-tuple (source IPv6 address, destination
IPv6 address, source port number, destination port number, and protocol number) to describe a data flow.
After the first packet of a flow is forwarded through the routing table, fast forwarding creates an entry for
the flow and uses the entry to forward subsequent packets of the flow.
IPv6 fast forwarding is supported on all high-speed link interfaces, including Ethernet links, synchronous
PPP links, and HDLC links. However, it is not supported on PPP MP links and compression-enabled PPP
links.
IPv6 fast forwarding is not supported on 6PE devices and tunnels.
Configuration guidelines
Follow these guidelines when you configure IPv6 fast forwarding:
• Enable IPv6 before you perform IPv6 fast forwarding configurations.
• To enable per-packet load balancing, you must disable IPv6 fast forwarding in the corresponding
direction of related interfaces.
• After IPv6 fast forwarding is enabled on an interface, no IPv6 packet debugging information is
displayed for the interface by using the debugging ipv6 packet command.
• To implement IPv6 fast forwarding for a single data flow, enable IPv6 fast forwarding in the
inbound direction of the incoming interface and in the outbound direction of the outgoing interface.
Configuration procedure
Step Command Remarks
1. Enter system view.
system-view N/A
2. Enter interface view.
interface interface-type
interface-number
N/A
3. Enable IPv6 fast forwarding
on the interface in the
inbound and/or outbound
direction.
ipv6 fast-forwarding
[ inbound | outbound ]
Optional.
By default, IPv6 fast forwarding is enabled
in the inbound and outbound directions.