Case study on environmental optimization of Metro Ethernet

Metro Ethernet is still commonly used. So I have studied the case study on environmental optimization of Metro Ethernet. Here I will share it with you and hope it will be useful to you. Before implementing this optimization scheme, the access layer switches in the current network come to three aggregation layer Ethernet switches Aggregate-1, Aggregate-2 and Aggregate-3 in a single star structure, due to the scalability and security restrictions of Traditional Ethernet switches, they are forced to be divided into three isolated Ethernet islands.

After the Ethernet solution of Beijing telecom operator is optimized, the original limitations and problems are solved. The Ethernet devices on the Convergence layer and the access layer are integrated to form a complete Metro Ethernet. The specific effect after optimization is as follows:

1. 802.1ah solves scalability and security problems

The Beijing-electric MERS8600 Metro Ethernet switch builds a complete Ethernet network according to the 802.1ah standard. The network supports over 30 thousand VPNs and each VPN can support over 4096 VLANs, A total of about million VLANs, fundamentally solving scalability problems; to carry out Metro Ethernet leased line business no longer requires the intervention of a higher layer of network.

The Beijing-electric MERS8600 Metro Ethernet switch adopts the 802.1ah standard to implement MAC in MAC forwarding mode, which can safely isolate interfaces between users and networks. The global MAC address forwarding table of MERS8600 does not contain the MAC address forwarding entries of the end user. The size of the global MAC address forwarding table is only related to the Ethernet UNI connection of MERS8600, because there are only three MERS8600 entries in the network, the number of global MAC address forwarding tables cannot exceed 100. Therefore, the query speed is fast and is not affected by any access to users. The network is stable and reliable. In addition, each VPN service has its own independent MAC address forwarding table, which is immediately attacked by MAC addresses. The impact scope is also limited to the VPN where the attack source is located, which does not pose a threat to the security of the man. If there are 0.2 million users across the network, they can be divided into multiple VPNs, so that the number of MAC address forwarding entries for each VPN is not large. Changes of each user will only affect the refresh of the MAC address forwarding table in the VPN where the user is located, and will not affect other VPN users, or the refresh of the global table, this ensures network security and stability.

2. Ethernet network provides 50 ms switching protection for telecom-grade Reliability

The Beijing-electric MERS8600 Metro Ethernet switch adopts a ring structure and uses the remote module ESU1800 on the Ethernet Access ring to implement carrier-class 50 ms switching protection and greatly reduce the demand for optical fiber resources. A large number of studies have shown that 50 ms is an important indicator to measure the survivability of the transmission network. If the service interruption time exceeds 50 ms, for the real-time voice, video, and data services of most Circuit Switching Networks, unacceptable service quality of QoS will be reduced.

3. troubleshooting tool Service Ping solves management and maintenance problems

In accordance with the 802.1ag and ITU Y.1731 standards, the Beijing-based MERS8600 Metro Ethernet switch provides a Service Ping tool to test the connectivity of each VPN Service, pay attention to network latency and monitor SLA execution.

4. PBT enhanced Ethernet certainty to ensure service quality

Byte MERS8600 operational Ethernet PBT is a simple point-to-point channel technology that enhances the certainty of Ethernet and specifies the path for the carrier to use for Ethernet services to pass through the network. PBT ensures service quality by retaining bandwidth for real-time services, and even if the connection is terminated, PBT provides a service recovery time of 50 milliseconds. In addition, PBT can be seamlessly integrated with MPLS-based core networks to support all currently popular MPLS services. PBT also helps solve the scalability problem of Ethernet. Due to the protection from Ethernet broadcast and learning functions, the problem of "Network Flooding" is solved; otherwise, network resources will be occupied by the continuous communication between a large number of Ethernet devices in the network. The combination of PBT and the carrier's Backbone Network Bridge 802.1ah can meet the needs of millions of users in the city to enjoy the Ethernet service at the same time.

Conclusion

The simplicity and economics of Ethernet have made it the most successful data transmission technology in telecom history so far. However, as a technology developed for enterprise networks, if you do not solve the problems of scalability, security, reliability, service quality, and maintenance management, ethernet cannot achieve the grand goal of unifying the second layer. At present, MEF, IEEE, IETF and other major standardization organizations are stepping up their efforts to study Metro Ethernet standards. 802.1ah, 802.1ag, and innovative PBT technologies are milestones in the development of Ethernet technology from LAN to man. With an operational Ethernet switch, you can build a complete Metro Ethernet, and gradually achieve China Telecom's goal of building a "Layer 2.