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Chapter 33 Flex Link
XGS2220 Series User’s Guide
226
CHAPTER 33
Flex Link
This chapter introduces how to set up a backup link for a primary link using Flex Links.
33.1 Flex Link Overview
A flex link pair consists of a primary link and a backup link on a layer-2 interface. A primary link runs on a
Primary Port; a backup link runs on a Backup Port. The ports have two states: FORWARDING and
BLOCKING. When one link is up and running (port state: FORWARDING), the other link is in down or in
standby mode (port state: BLOCKING). Only one port is forwarding traffic (FORWARDING) at a time.
When the primary link goes down, the backup link automatically goes up and is able to forward traffic.
Preemption
Enable Preemption to have the Switch automatically return the primary port to FORWARDING state after
the connection from the primary port resumes, and the backup port return to BLOCKING. The Switch will
wait for the specified Preemption Delay Time before changing the primary port state to FORWARDING
and backup port state to BLOCKING. See Table 106 on page 229 for more information.
33.1.1 What You Can Do
• Use the Flex Link Status screen (Section 33.2 on page 226) to view the flex link status on the Switch.
• Use the Flex Link Setup screen (Section 33.3 on page 227) to configure flex links for back up links on
the Switch.
33.2 Flex Link Status
Click PORT > Flex Link > Flex Link Status to display this screen.
Figure 165 PORT > Flex Link > Flex Link Status
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