R3303-HP HSR6800 Routers Layer 2 - LAN Switching Configuration Guide

8
Category Description
Extended LACP
functions
Implemented by extending the LACPDU with new TLV fields. This is how IRF
LACP MAD is implemented. If a device supports LACP extensions, the device
can:
• Participate in LACP MAD as either an IRF member device or an intermediate
device. (In IRF mode.)
• Participate in LACP MAD only as an intermediate device. (In standalone
mode.)
For more information about IRF, member devices, intermediate devices, and the LACP MAD
mechanism, see IRF Configuration Guide.
2. LACP priorities:
LACP priorities have the following types: system LACP priority and port aggregation priority. The
smaller the priority value, the higher the priority.
Table 4 LACP priorities
T
yp
e Descri
p
tion
System LACP priority
Used by two peer devices (or systems) to determine which one is superior in link
aggregation.
In dynamic link aggregation, the system with higher system LACP priority sets the
Selected state of member ports on its side first, and then the system with lower priority
sets the port state accordingly.
Port aggregation
priority
Determines the likelihood of a member port to be selected on a system. The higher the
port aggregation priority, the higher the likelihood.
3. LACP timeout interval:
LACP timeout interval specifies how long a member port waits to receive LACPDUs from the peer
port. If a local member port fails to receive LACPDUs from the peer within three times the LACP
timeout interval, the member port assumes that the peer port has failed. You can configure the
LACP timeout interval as either the short timeout interval (1 second) or the long timeout interval (30
seconds).
Aggregating links in static mode
LACP is disabled on the member ports in a static aggregation group. You must manually maintain their
aggregation state.
Choosing a reference port
The system chooses a reference port from the UP member ports that have the same class-two
configurations as the aggregate interface.
The candidate ports are sorted by aggregation priority, duplex, and speed in the following order:
• Lowest aggregation priority value
• Full duplex/high speed
• Full duplex/low speed
• Half duplex/high speed
• Half duplex/low speed