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CX11x, CX31x, CX710 (Earlier Than V6.03), and CX91x Series Switch Modules V100R001C10 Configuration Guide 12

The documents describe the configuration of various services supported by the CX11x&CX31x&CX91x series switch modules The description covers configuration examples and function configurations.
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Introduction to Smart Link and Monitor Link

Introduction to Smart Link and Monitor Link

This section describes the concepts and functions of Smart Link and Monitor Link.

Definition

Smart Link is a link backup feature. A Smart Link group consists of two interfaces. One interface is the backup of the other. Smart Link is often used in dual-homing networking to implement link backup and rapid switchover.

Monitor Link monitors a device uplink interface and triggers the downlink interface status change according to the uplink interface status, which triggers switching of a topology protocol on the downstream device.

Purpose

When a device connects to an upstream device through a single uplink, services are interrupted if a single point failure occurs. In dual-homing networking, a downstream device is connected to two upstream devices to reduce impact of single point failures and improve network reliability.

Figure 11-69 Smart Link in dual-homing networking

As shown in Figure 11-69, SwitchA is connected to SwitchB and SwitchC in dual-homing mode. Therefore, two links are available from SwitchA to SwitchD: SwitchA -> SwitchB -> SwitchD and SwitchA -> SwitchC -> SwitchD. Network loops may cause broadcast storms. Smart Link is configured on SwitchA. Normally, the link of Interface1 transmits traffic, and the link of Interface2 is a backup link. If the link of Interface1 fails, Smart Link automatically switches all the data traffic to the link of Interface2, ensuring nonstop service transmission.

Smart Link has following advantages:
  • Prevents broadcast storms caused by loops. When two links are running properly in dual-homing networking, only one link transmits traffic and the other link is blocked.
  • Is easy to configure and use.
  • Ensures data forwarding. When the active link is faulty, traffic is switched to the standby link in milliseconds.

On some networks where Layer 2 topology protocols such as Smart Link are used, topology protocols cannot monitor the uplink interface status. As a result, services cannot be switched. Monitor Link monitors the uplink interface status of a device and changes the downlink interface status according to the uplink interface status, which triggers switching of a topology protocol on the downstream device. Monitor Link prevents traffic loss caused by the uplink fault.

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Updated: 2019-08-09

Document ID: EDOC1000041694

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