ZyXEL ES-3148 Guida Utente

ES-3148 User’s Guide

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 Switch supports both static and dynamic link aggregation.

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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 Switch.

See 

 for a static port trunking example.

The IEEE 802.3ad standard describes the Link Aggregation Control Protocol (LACP) for 
dynamically creating and managing trunk groups.
The Switch adheres to the IEEE 802.3ad standard for static and dynamic (LACP) port 
trunking.
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.