Smart Link And Monitor Link; Configuring A Smart Link Group; Establishing The Configuration Task - Huawei Quidway S3700 Series Configuration Manual

Quidway S3700 Series Ethernet Switches
Configuration Guide - Reliability

2.1 Smart Link and Monitor Link

This section describes the concepts of Smart Link and Monitor Link.
The dual-homing networking is often used. In this networking, STP blocks redundant links,
providing redundancy. When the active link fails, the traffic is switched to the standby link.
Although this scheme can implement redundancy, the performance cannot meet the requirements
of users. Route convergence is performed within several seconds even if the Rapid Spanning
Tree Protocol (RSTP) is used. The convergence speed is unfavorable for the high-end Ethernet
switch used on the core of the carrier-class network.
To address the preceding problem, Huawei introduces Smart Link in dual-homing networking
to implement redundancy of active and standby links and fast transition. In this manner, the high
performance is ensured and the configuration is simplified. In addition, cooperation of interfaces
is used.
The Monitor Link is introduced as a supplement to the Smart Link. This technology supports
the association of interfaces. A Monitor Link group consists of an uplink interface and several
downlink interfaces. If the uplink interface fails, the Monitor Link group automatically disables
the downlink interfaces. When the uplink interface recovers, the downlink interfaces also
recover.

2.2 Configuring a Smart Link Group

This section describes how to create a Smart Link group, enable the Smart Link group, configure
the master and slave interfaces, enable the revertive switching, and configure functions related
to Flush packets.

2.2.1 Establishing the Configuration Task

Applicable Environment
As shown in
uplink devices. This networking mode provides higher security and reduces the duration of
service interruption caused by the link failure.
Issue 01 (2011-10-26)
Figure 2-1, each device at the access and convergence layer is connected to two
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2 Smart Link and Monitor Link Configuration
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