Flex Links Configuration
Chapter 32. Flex Links Configuration
32.1 Flex links Overview
Flex links is layer 2 links backup protocol which provides for STP option scheme. Choose
Flex links to realize link backup when the STP is not wanted in customer network. If STP
enables, flex links is disabled. Flex links consists of a pair of interfaces（can be ports or
convergent interface）. One interface is transmitting data, the other is standby. The backup
interface starts transmitting data when there is default in master link. The failure interface will
be standby when it turns well and it will be transmitting data in 60 seconds when preempt
mechanism is set. Flex links interface should disable STP and Flex links interface can
configure bandwidth and delay being preempt mechanism and the superior one will be the
master interface. There must be trap alarm when master or backup link default.
Flex Link is dedicated to dual-uplink networks. It delivers the following benefits:
Keeping one uplink connected and the other blocked when both uplinks in a dual uplink
network are healthy, thus preventing broadcast storms caused by network loops.
Switching the traffic to the backup link within a few subseconds when the primary link fails,
thus ensuring the normal forwarding of traffic in the network.
Easy to configure.
32.1.1 Basic Concept of Flex Links
Flex Links group
A Flex link group consists of only two member ports: the master and the slave. At a time,
only one port is active for forwarding, and the other port is blocked, that is, in the standby
state. When link failure occurs on the active port due to port shutdown or presence of
unidirectional link for example, the standby port becomes active to take over while the original
active port transits to the blocked state.
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