Switch Screens; Dynamic Link Aggregation - ZyXEL Communications MSC1000G User Manual

This chapter describes the screens you use to configure Ethernet ports, multicast VLAN and global
switch parameters such as GARP, link aggregation, priority queues and queuing method.
13.1 Ethernet Port Trunking
Ethernet port trunking lets you aggregate the Ethernet ports into one logical link. The switch uses
MAC-based load balancing which analyzes a packet's source and destination MAC addresses to
distribute the load between the two Ethernet ports when uplinking to the remote switch.
Note: The remote switch must also support Ethernet port trunking. The load-balancing
method, however, does not have to be the same as on this switch.
Note: The two uplink ports or two subtending ports must be connected to a single remote
switch when port trunking is enabled.

13.2 Dynamic Link Aggregation

The MSC adheres to the IEEE 802.3ad standard for static and dynamic (LACP) port trunking.
The MSC supports the link aggregation IEEE 802.3ad standard. This standard describes the Link
Aggregate 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.
Configure trunk groups or LACP before you connect the Ethernet switch to avoid causing network
topology loops.
Note: MSC1224G does not support this feature.
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