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Understanding Virtual Chassis Configurations and Link Aggregation

You can combine physical Ethernet ports belonging to different member switches of a Virtual Chassis configuration to form a logical point-to-point link, known as a link aggregation group (LAG) or bundle. A LAG provides more bandwidth than a single Ethernet link can provide. Additionally, link aggregation provides network redundancy by load-balancing traffic across all available links. If one of the links fails, the system automatically load-balances traffic across all remaining links.

You can select up to 8 Ethernet interfaces from the different member switches of the Virtual Chassis configuration and include them within a link aggregation group. A full Virtual Chassis configuration can support up to 64 LAGs.

Note: The interfaces that are included within a LAG are sometimes referred to as member interfaces. Do not confuse member interfaces and member switches. The member switches are individual EX 4200 switches that have been interconnected with their Virtual Chassis ports (VCPs) to operate as a single network entity. In a Virtual Chassis configuration, you can create a LAG formed of member interfaces that represent ports belonging to different member switches.

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