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Interconnecting Data Centers Using VPLS (Ensure Business Continuance on Virtualized Networks by Implementing Layer 2 Connectivity Across Layer 3) by Patrice Bellagamba, Nash Darukhanawalla - CCIE No. 10332

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Chapter 3. High Availability for Extended Layer 2 Networks

The following design components must be considered to achieve high availability when extending Layer 2 networks:

• Maximum transmission unit (MTU) evaluation for intersite core transport

• Core routing

• Convergence optimization

This chapter focuses on the components listed to achieve high availability.

MTU Evaluation for Intersite Transport

As in any Ethernet encapsulation technology, MTU is an important aspect to consider. The packet-switched network (PSN) must be configured with an MTU that is large enough to transport a maximum-size Ethernet frame that is encapsulated with a control word, a pseudowire (PW) demultiplexer, and a tunnel encapsulation. If the tunneling protocol is Multiprotocol ...

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