Loop prevention mechanisms on CE series switches at the edge of a TRILL network

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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.

Other related questions:
Do CE series switches support transparent transmission of BPDUs on a TRILL network
In V100R003C10 and earlier versions, CE series switches do not support transparent transmission of BPDUs on a TRILL network. In V100R003C10 and later versions, you can configure association between TRILL and MSTP for transparent transmission of BPDUs on a TRILL network without changing the root bridge.

Loop prevention and breaking on S series switch
For S series switches except S1700 switches, use any of the following methods to remove loops: 1. Configure features such as STP, RSTP, MSTP, VBST,RRPP, and SEP to prevent loops. 2. Bundle dual physical links into a single logical link to prevent loops while implementing redundancy and increasing bandwidth. 3. Configure the switch to transparently transmit packets of different VLANs along different paths. 4. Enable loop detection and loopback detection to detect loops on the switch or downstream network connected to the switch, and configure the switch to take the preconfigured action to remove loops. Fixed switches only support loopback detection.

CE series switch ACL resources
For more information about CloudEngine Series Switches ACL Working Mechanism, click CloudEngine Series Switches ACL Working Mechanism.

CE series switch Error-Down mechanism
For more information about the CloudEngine Series Switches Error-Down Mechanism, click CloudEngine Series Switches Error-Down Mechanism.

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