SNR S2989G-48TX-DC — руководство по настройке ULSM для надежной конфигурации сети [428/553]

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S2989G-24TX Operation Manual

Chapter 7 Reliability Configuration

7-29

can not be a member port of a port channel, and each port only belongs to one ULSM

group.

The uplink port is the monitored port of ULSM group. When all uplink ports are down

or there is no uplink port in ULSM group, ULSM group state is down. ULSM group state is

up as long as one uplink port is up.

The downlink port is the controlled port, its state changes along with Up/Down of

ULSM group and is always the same with ULSM group state.

ULSM associates with ULPP to enable the downstream device to apperceive the link

problem of the upstream device and process correctly. As the picture illustrated, SwitchA

configures ULPP, here the traffic is forwarded by port A1. If the link between SwitchB and

Switch D has the problem, SwitchA can not apperceive the problem of the upstream link

and sequentially forward the traffic from port A1, cause traffic losing.

Configuring ULSM on SwitchB can solve the above problems. The steps are: set port

B5 as the uplink port of ULSM group, port B6 as the downlink port. When the link between

SwitchB and SwitchD has the problem, both the downlink port B6 and the state of ULSM

group are down. It causes Switch A on which ULPP is configured to process uplink

switchover and avoid the data dropped.

Figure 7-12 ULSM using scene

7.4.2

ULSM Configuration Task List

1. Create ULSM group globally

2. Configure ULSM group