Zyxel XGS3700-24HP [4/9] Scenario one stack two switches

ZyXEL Communication Crop, 3

2. Scenario One: Stack two Switches

2.1 Topology

2.2 Application Scenario

In configuration illustrated above, the 2 clients are performing FTP & video streaming

from the server. To go through this scenario, you will able to understand how

stacking to achieve cross-stack LACP for better resiliency. Also to understand how the

advanced fail-over design of stacking master & stacking links work.

2.2.1 Cross-Stack LACP

With stacking enabled, access switch can have multiple links to different units in a

stack and perform link aggregation. In the scenario, you’ll be able to see 2Gbps FTP

aggregated throughput on the Server, and any LACP link drops (one at a time), you

can still see 1Gbps on the Server. It will recover to 2Gbps when the link is recovered.

For the video streaming in this scenario, only less than one second of screen frozen

when any of the LACP link drops.

Note:

When the client keeps doing ping to server with ICMP during the testing. 0 to 1 ping

lost are expected during link drop and recover. It is because LACP will need time to

converge.