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Global Roles and Local Roles in a Virtual Chassis

 

In a Virtual Chassis configuration for MX Series 5G Universal Routing Platforms or EX9200 switches, each of the two member devices and each of the two Routing Engines in each member device has a distinct role. A global role defines the function of each member device in the Virtual Chassis, and applies globally across the entire Virtual Chassis. A local role defines the function of each Routing Engine in the member device, and applies locally only to that member device.

Global roles change when you switch the Virtual Chassis primary role, and both global roles and local roles change when you switch the Routing Engine primary role in one of the member devices. In addition, the line-card global role, though not supported in a preprovisioned configuration for a two-member MX Series or EX9200 Virtual Chassis, applies in the context of split detection behavior.

This topic describes the global roles and local roles in a MX Series or EX9200 Virtual Chassis so you can better understand how the Virtual Chassis behaves during a global primary role switch, a local Routing Engine switchover, or when split detection is enabled.

Role Name Format

The global and local role names in an MX Series or EX9200 Virtual Chassis use the following format:

VC-GlobalRole<LocalRole>

where:

  • GlobalRole applies to the global function of the member device for the entire Virtual Chassis, and can be one of the following:

    • M—Virtual Chassis primary device, also referred to as the protocol primary.

    • B—Virtual Chassis backup device, also referred to as the protocol backup.

    • L—Virtual Chassis line-card device. The line-card role is not supported in the preprovisioned configuration for a two-member Virtual Chassis. The line-card role applies only in the context of split detection behavior.

  • LocalRole (optional) applies to the function of the Routing Engine in the local member device, and can be one of the following:

    • m—Primary Routing Engine

    • s—Standby Routing Engine

Global Role and Local Role Descriptions

Table 1 describes the global roles and local roles in an MX Series or EX9200 Virtual Chassis.

Table 1: Global Roles and Local Roles

Virtual Chassis Role

Type of Role

Description

VC-P

Global

Primary device for the Virtual Chassis

VC-B

Global

Backup device for the Virtual Chassis

VC-L

Global

Line-card device for the Virtual Chassis

Note: The line-card role is not supported in the preprovisioned configuration for a two-member MX Series or EX9200 Virtual Chassis. The line-card role applies only in the context of split detection behavior.

VC-Pp

Local

Primary Routing Engine in the Virtual Chassis primary device

VC-Ps

Local

Standby Routing Engine in the Virtual Chassis primary device

VC-Bp

Local

Primary Routing Engine in the Virtual Chassis backup device

VC-Bs

Local

Standby Routing Engine in the Virtual Chassis backup device

VC-Lm

Local

Primary Routing Engine in the Virtual Chassis line-card device

Note: The line-card role is not supported in the preprovisioned configuration for a two-member MX Series or EX9200 Virtual Chassis. The line-card role applies only in the context of split detection behavior.

VC-Ls

Local

Standby Routing Engine in the Virtual Chassis line-card device

Note: The line-card role is not supported in the preprovisioned configuration for a two-member MX Series or EX9200 Virtual Chassis. The line-card role applies only in the context of split detection behavior.