How to select loop prevention protocols

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When creating a new network using S series switches (except the S1700), select loop prevention protocols based on your network requirements:
1.   If the network services have high performance requirements (for example, if millisecond-level convergence is required when a fault occurs), select the SEP, RRPP, and SMLK protocols. Otherwise, select the STP protocol.
2.   If you are creating a ring network, select the SEP and RRPP protocols. If you are creating a tree network, select the STP protocol. If two uplink ports are used to transmit data, select the SMLK protocol.
3.   If the network must connect to other vendors' devices, select the STP protocol. Otherwise, select the Smart Ethernet Protection (SEP) protocol. SEP is a technology developed by Huawei that supports topology viewing, multiple modes for selecting blocking points, and millisecond-level fault convergence time. SEP is recommended for new networks.

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How to select loop prevention protocols
When creating a new network using S series switches (except the S1700), select loop prevention protocols based on your network requirements:
1.   If the network services have high performance requirements (for example, if millisecond-level convergence is required when a fault occurs), select the SEP, RRPP, and SMLK protocols. Otherwise, select the STP protocol.
2.   If you are creating a ring network, select the SEP and RRPP protocols. If you are creating a tree network, select the STP protocol. If two uplink ports are used to transmit data, select the SMLK protocol.
3.   If the network must connect to other vendors' devices, select the STP protocol. Otherwise, select the Smart Ethernet Protection (SEP) protocol. SEP is a technology developed by Huawei that supports topology viewing, multiple modes for selecting blocking points, and millisecond-level fault convergence time. SEP is recommended for new networks.

How to select loop prevention protocols when creating a network
Select loop prevention protocols when creating a network based on the site requirements as follows: If network services have high performance requirements (for example, the fault convergence time must be at the millisecond level), select the SEP, RRPP, and SMLK protocols. Otherwise, select the STP protocol. If the network structure is a ring topology, select the SEP and RRPP protocols. If the network structure is a tree topology, select the STP protocol. If two uplink ports are used to transmit data, select the SMLK protocol. If the network must connect to other manufacturers, select the STP protocol. Otherwise, select the SEP protocol. The Smart Ethernet Protection (SEP) technology is developed by Huawei. The SEP supports topology viewing, multiple modes for selecting blocking points, millisecond-level fault convergence time. The SEP is recommended for new networks.

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.

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.

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