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Saturday, December 28, 2019

Huawei SEP L2 Protocol

SEP Overview

Definition 
 
The Smart Ethernet Protection (SEP) protocol is a ring network protocol specially used for the Ethernet link layer. SEP selectively blocks redundant links to eliminate Layer 2 loops, which effectively prevents ring faults such as broadcast storms and MAC address table flapping. 

Purpose 

As networks are spreading and network applications become diversified, reliability of basic networks is the focus of users. It is important to ensure non-interrupted service transmission.

Generally, redundant links are used on a network to provide link backup and enhance network reliability. The use of redundant links, however, may produce loops, causing broadcast storms.
   
To solve the loop problem, Huawei datacom devices support many ring network protocols such as Spanning Tree Protocol (STP). STP is a standard protocol for eliminating loops on Ethernet networks. The network convergence time of STP is affected by the network topology. On a large network, convergence is slow, failing to meet transmission requirements of some real-time services.

Huawei developed SEP to overcome the disadvantages of other ring network protocols. SEP boasts fast convergence (less than 50 ms). Compared with STP, SEP meets transmission requirements of real-time services. When the network is complete, SEP selectively blocks redundant links to eliminate loops; when a link on the ring network fails, SEP immediately unblocks the blocked port and performs link switching, protecting user services on the network.

Benefits

SEP brings customers a new choice of the ring network protocol. Compared with traditional ring network protocols such as STP, SEP boasts fast convergence and applies to Layer 2 networks requiring short convergence time. In addition, SEP has the following advantages:
  • Applies to diverse scenarios, and supports various network topologies and flexible configurations.
  • Allows selective port blocking, which effectively implements traffic load balancing.

Note: SEP is a Huawei proprietary protocol. 

Open-Ring Networking

As shown in Figure 1, Router1 to Router5 form an open ring to access a Layer 2 network. The two edge devices on the Layer 2 network, that is, Router1 and Router5, are not directly connected. This networking is called open-ring networking. The open-ring networking is at the access layer and is used to transparently transmit Layer 2 unicast and multicast services. When SEP runs at the access layer, redundancy protection switching can be implemented at the access layer and topology of the SEP segment can be displayed.

On an open-ring network, edge interfaces are located on the two edge devices in the SEP segment.

Fig: 1 Networking diagram of an open ring running SEP

 

Closed-Ring Networking

As shown in Figure 2, Router1 to Router5 form a dual-homed link to access a Layer 2 network. Router1 and Router5at the edge of the Layer 2 network are directly connected. This networking is called closed-ring networking. The networking is at the aggregation layer and is used to aggregate Layer 2 unicast and multicast services. When SEP runs at the aggregation layer, redundancy protection switching can be implemented at the aggregation layer and the topology of the SEP segment can be displayed.

On a closed-ring network, two edge interfaces are located on the same edge device.

Fig:2 Networking diagram of a closed ring running SEP



Reference URLS:
https://actfornet.com/HUAWEI_SWITCH_DOCS/All_Docs/Huawei%20Smart%20Ethernet%20Protection%20(SEP)%20Technology%20White%20Paper.pdf 
http://support.huawei.com/enterprise/docinforeader!loadDocument1.action?contentId=DOC1000079693&partNo=10162

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