MSM7xx Controllers Configuration Guide v6.4.0

5 Port trunking
Port trunking enables the MSM720 to combine multiple physical links into a single logical link
(trunk) to provide redundancy in the case of link failure.
The MSM720 supports static trunking, and dynamic trunking using the LACP (Link Aggregation
Control Protocol).
Possible applications for trunking include:
• Creating a high-availability trunk to send egress traffic from the controller to a network: In
this example, a static trunk is created using ports 5 and 6 to send all traffic from APs located
on different networks onto a private network. The trunk has two links, providing redundancy
in the case of link failure.
• Creating a high-availability trunk to tunnel traffic from wireless client stations to the controller:
In this example, a dynamic trunk is created between the switch and the controller to consolidate
all traffic from the controlled APs. The trunk has six links, providing redundancy in the case
of link failure. (Only two links can be active at any given time. The remainder act as backups.)
70 Port trunking