How is the CSS dual-homed to the downlink switch

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After S9306 switches establish a CSS, the CSS can be connected to the uplink or downlink switch through the Eth-Trunk.

Other related questions:
Loop prevention mechanisms on CE series switches at the edge of a TRILL network
Currently, you can perform the following operations to detect and eliminate loops when user-side devices connect to a TRILL network: 1. Configure the assured forwarding (AF) function on the edge device of the TRILL network so that only one device forwards user traffic, preventing loops. 2. In V100R003C00 and later versions, configure association between TRILL and MSTP when an MSTP network connects to a TRILL network. 3. In V100R003C00 and V100R003C10, configure an E-Trunk to enable dual-homing access to TRILL for active-active access if user-side devices are servers or network devices are dual-homed to the TRILL network. 4. In V100R005C00 and later versions, configure a multi-chassis link aggregation group (M-LAG) to enable dual-homing access to TRILL for active-active access if user-side devices are servers or network devices are dual-homed to the TRILL network.

Is IS-IS applicable to a network where a CE is dual-homed to two PEs
IS-IS can be used on a network where a CE is dual-homed to two PEs. However, IS-IS configuration is different from OSPF configuration. To obtain more information about how IS-IS is used on a network where a CE is dual-homed to two PEs, click FAQ-IS-IS能不能使用在CE-PE双归组网 .

Differences between dual-homing diamond services and associated services
Dual-homing diamond services have similar application scenarios to associated silver services originated from the same source. They differ in the number of managed services. Specifically, two services are managed for associated silver services, but only one ASON service needs to be managed for a dual-homing diamond service. Associated silver services originated from the same source can be converted into dual-homing diamond services.

How do S series modular switches establish a CSS
When a server is dual-homed to CE switches through M-LAG, the server cannot transmit traffic to one of the CE switches
The cause is that the LACP M-LAG system priorities and IDs of two CEs in the M-LAG are inconsistent. Eth-Trunks on both switches configured with M-LAG must use the same LACP M-LAG system priority and ID. - In V100R006C00 and earlier versions, run the lacp m-lag priority priority command on the Eth-Trunks of both switches configured with M-LAG to set the same LACP M-LAG system priority and run the lacp m-lag system-id mac-address command to set the same LACP M-LAG system ID. - In V200R001C00 and later versions, the slave switch in the M-LAG automatically synchronizes the LACP M-LAG system priority and ID of the master switch through the peer-link.

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