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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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Applicable Scenario

Applicable Scenario

This section describes the applicable scenario of Smart Link and Monitor Link.

Application of Smart Link Load Balancing

In dual-homing networking, Smart Link can be used to remove loops. Only one uplink is in forwarding state and the other link does not forward traffic. Therefore, the link utilization is only 50% Smart Link provides load balancing to improve link use efficiency.

Figure 11-80 Networking of Smart Link load balancing

As shown in Figure 11-80, a load balancing instance is configured and VLAN 300 to VLAN 400 are associated with the instance. Then data packets sent from VLAN 300 to VLAN 400 are forwarded through the standby link of SwitchD. VLAN 100 to VLAN 200 are not associated with the load balancing instance, so packets sent from these VLANs are forwarded through the active link. In this way, traffic from different VLANs is load balanced between the two links, improving link use efficiency.

Combination of Smart Link and Monitor Link

Smart Link can only detect faults of links directly connected to member interfaces. For example, interface1 and interface2 on SwitchD are configured with Smart Link. As shown in Figure 11-81, Smart Link can only detect the fault of the link between interface1 and SwitchB or between interface2 and SwitchC. If the uplink between SwitchB and SwitchA fails, Smart Link cannot detect this fault so that it does not trigger a switchover, leading to traffic loss.

If you configure Monitor Link on the upstream devices, Smart Link can detect the fault and switch traffic to the standby link quickly. Combination of Smart Link and Monitor Link expands the application scope of Smart Link and allows flexible networking.

Figure 11-81 Combination of Smart Link and Monitor Link

As shown in Figure 11-81, Smart Link is configured on SwitchD and SwitchE. When the link between SwitchB and SwitchD or between SwitchC and SwitchE is faulty, the Smart Link group can detect the fault and switch services to the standby link quickly. To enable SwitchD or SwitchE to detect the fault on the link between SwitchA and SwitchB or between SwitchA and SwitchC, configure Monitor Link on SwitchB and SwitchC.

Use SwitchD and SwitchB for example. A Smart Link group is configured on SwitchD, and interface1 and interface2 are added to this Smart Link group. A Monitor Link group is configured on SwitchB. Interface5 is the uplink interface, and interface3 and interface4 are the downlink interfaces. When the Monitor Link group detects a fault on the uplink, downlink interfaces are shut down forcibly. A switchover is then triggered in the Smart Link group on SwitchD. When the fault on the uplink interface is rectified, downlink interfaces are enabled automatically. In this way, SwitchD can detect the uplink status change.

Cascading of Smart Link and Monitor Link

Figure 11-82 shows cascading networking of Smart Link and Monitor Link. Cascading of Smart Link and Monitor Link improves link backup reliability. A Smart Link group can function as the uplink interface of a Monitor Link group.

Figure 11-82 Cascading of Smart Link and Monitor Link

As shown in Figure 11-82, the uplink interfaces on SwitchC and SwitchJ are added to Smart Link groups to guarantee reliability. Monitor Link groups are configured on SwitchC and SwitchJ and the Smart Link groups are added to the Monitor Link groups. An active/standby switchover is performed between the downlink interfaces only when both the two uplink interfaces in a Smart Link group are down.

Table 11-26 lists the configuration of Smart Link and Monitor Link.
Table 11-26 Configuration of Smart Link and Monitor Link

Smart Link Group

Monitor Link Group

Master Port

Slave Port

Uplink Port

Downlink Port


Interface C2

Interface C3

Smart Link Group

Interface C2, Interface C3

Interface C1


Interface J2

Interface J3

Smart Link Group

Interface J2, Interface J3

Interface J1


Interface F1

Interface F2

No Monitor Link group configured

Updated: 2019-08-09

Document ID: EDOC1000041694

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