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Configuring Switching
22
SonicOS 5.7: Advanced Switching Feature Guide and Screencast Tutorial
Figure 14 illustrates the two types of link aggregation.
Figure 14 Two Types of Link Aggregation: NSA to Server and NSA to Switch
Similarly to PortShield configuration, you select an interface that represents the aggregated group. This port
is called an aggregator. The aggregator port must be assigned a unique key. By default, the aggregator port
key is the same as its interface number. Non-aggregator ports can be optionally configured with a key, which
can help prevent an erroneous Logical Link if the switch connections are wired incorrectly.
Ports bond together if connected to the same link partner and their keys match. If there is no key configured
for a port (if the port is in auto mode), it will bond with an aggregator that is connected to the same link
partner. The link partner is discovered via LACP messages. A link partner cannot be discovered for Static
link aggregation. In this case, ports aggregate based on keys alone.
Like a PortShield host, the aggregator port cannot be removed from the Logical Link since it represents the
Logical Link in the system.
Note Once link aggregation has been enabled on VLAN trunk ports, additional VLANs cannot be
added or deleted on the Logical Link.
Note If you need to enable RSTP on the Logical Link, first enable RSTP on the individual
members and then enable link aggregation.
2400MX
Network Security Appliance
Switch
Eng
VLAN
QA
VLAN
Logical Link
Redundant and Load Balanced
Server
Logical Link
Redundant - Not Load Balanced
Internet