Link Aggregation Overview; Link Aggregation; Lacp - 3Com MSR 50 Series Configuration Manual

15

Link Aggregation

LACP

L A
INK
n
Link aggregation is not supported on MSR 20 series routers. It is only supported on
interfaces of 16FSW/24FSW modules of MSR 30/MSR 50 series routers.
Link aggregation aggregates multiple physical Ethernet ports into one logical link,
also called a logical group, to increase reliability and bandwidth.
This chapter covers these topics:
"Link Aggregation Overview" on page 345
■
"LACP" on page 345
■
"Load Sharing in a Link Aggregation Group" on page 349
■
"Aggregation Port Group" on page 349
■
Link aggregation allows you to increase bandwidth by distributing
incoming/outgoing traffic on the member ports in an aggregation group. In
addition, it provides reliable connectivity because these member ports can
dynamically back up each other.
This section covers these topics:
"LACP" on page 345
■
"Consistency Considerations for Ports in an Aggregation" on page 346
■
The link aggregation control protocol (LACP), as defined in IEEE 802.3ad, is used
for link aggregation control.
LACP interacts with its peer by sending link aggregation control protocol data
units (LACPDUs).
By adding a port to a static aggregation group, you can enable LACP on the port.
After LACP is enabled on a port, the port sends an LACPDU to notify the remote
system of its system LACP priority, system MAC address, port LACP priority, port
number, and operational key. Upon receipt of an LACPDU, the remote system
compares the received information with the information received on other ports to
determine the ports that can operate as selected ports. This allows the two
systems to reach an agreement on whether a port is a selected port.
When aggregating ports, link aggregation control automatically assigns each port
an operational key based on its rate, duplex mode, and other basic configurations.
In an aggregation group, the selected ports share the same operational key.
GGREGATION
O
VERVIEW