ZyXEL Communications OLT2406, User Manual

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Chapter 68 Link Aggregation
OLT2406 User’s Guide
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HAPTER
68
Link Aggregation
68.1 Link Aggregation Overview
This chapter shows you how to logically aggregate physical links to form one logical, higher-bandwidth
link.
Link aggregation (Trunking) is the grouping of physical ports into one logical higher-capacity link. You
may want to trunk ports if for example, it is cheaper to use multiple lower-speed links than to under-utilize
a high-speed, but more costly, single-port link.
However, the more ports you aggregate then the fewer available ports you have. A trunk group is one
logical link containing multiple ports.
The beginning port of each trunk group must be physically connected to form a trunk group.
The OLT supports both static and dynamic link aggregation.
Note: In a properly planned network, it is recommended to implement static link aggregation
only. This ensures increased network stability and control over the trunk groups on your
OLT.
See Section 68.4 on page 491 for a static port trunking example.
68.2 Dynamic Link Aggregation
The OLT adheres to the IEEE 802.3ad standard for static and dynamic (LACP) port trunking.
The OLT supports the link aggregation IEEE802.3ad standard. This standard describes the Link
Aggregation Control Protocol (LACP), which is a protocol that dynamically creates and manages trunk
groups.
When you enable LACP link aggregation on a port, the port can automatically negotiate with the ports
at the remote end of a link to establish trunk groups. LACP also allows port redundancy, that is, if an
operational port fails, then one of the “standby” ports become operational without user intervention.
Please note that:
• You must connect all ports point-to-point to the same Ethernet switch and configure the ports for
LACP trunking.
• LACP only works on full-duplex links.
• All ports in the same trunk group must have the same media type, speed, duplex mode and flow
control settings.