Description

Juniper’s Virtual Chassis technology allows multiple interconnected switches to operate as a single, logical unit, enabling users to manage all platforms as one virtual device. You can interconnect ip to six EX4000 switches as a Virtual Chassis using 2 x 10GbE SFP+ dedicated front-panel ports. Although configured as Virtual Chassis ports by default, you can also configure the 2 x 10GbE SFP+ ports as network ports. The Juniper EX4000 Switch can form a Virtual Chassis with any other models within the EX4000 product line. The Juniper EX4000 Switch deliver high availability (HA) through graceful Routing Engine switchover (GRES), and nonstop bridging and routing when deployed in a Virtual Chassis configuration.

In a Virtual Chassis configuration, each EX4000 switch is capable of functioning as a Routing Engine (RE). When you connect two or more Juniper EX4000 Switch, all Virtual Chassis member switches share a single control panel. Junos OS automatically initiates an election process to assign a primary (active) and backup (hot-standby) RE. An integrated L2 and L3 GRES feature maintains uninterrupted access to applications, services, and IP communications in the unlikely event of a primary RE failure.

When more than two switches are interconnected in a Virtual Chassis configuration, the remaining switch elements act as line cards and are available to assume the backup RE position should the designated primary RE fail. You can assign primary, backup, and line card priority status can to dictate the order of ascension; this N+1 RE redundancy, coupled with the GRES, nonstop active routing (NSR), and nonstop bridging (NSB) capabilities of Junos OS, assures a smooth transfer of control plane functions following unexpected failures.

Juniper EX4000 Switch implements the same slot/module/port numbering schema as other Juniper chassis-based products when numbering Virtual Chassis ports, providing true chassis-like operations. By using a consistent operating system and a single configuration file, all switches in a Virtual Chassis configuration are treated as a single device, greatly simplifying overall system maintenance and management.

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