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Global Roles and Local Roles in a Virtual Chassis
In a Virtual Chassis configuration for MX Series 3D Universal Edge Routers, each of the two member routers and each of the two Routing Engines in each member router has a distinct role. A global role defines the function of each member router 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 router, and applies locally only to that member router.
Global roles change when you switch the Virtual Chassis mastership, and both global roles and local roles change when you switch the Routing Engine mastership in one of the member routers. In addition, the line-card global role, though not supported in a preprovisioned configuration for a two-member MX Series Virtual Chassis, applies in the context of split detection behavior.
This topic describes the global roles and local roles in a MX Series Virtual Chassis so you can better understand how the Virtual Chassis behaves during a global mastership 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 Virtual Chassis use the following format:
VC-GlobalRole<LocalRole>
where:
- GlobalRole applies to the
global function of the member router for the entire Virtual Chassis,
and can be one of the following:
- M—Virtual Chassis master router, also referred to as the protocol master.
- B—Virtual Chassis backup router, also referred to as the protocol backup.
- L—Virtual Chassis line-card router. The line-card role is not supported in the preprovisioned configuration for a two-member MX Series 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 router,
and can be one of the following:
- m—Master 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 Virtual Chassis.
Table 1: Global Roles and Local Roles in an MX Series Virtual Chassis
Virtual Chassis Role | Type of Role | Description |
|---|---|---|
VC-M | Global | Master router for the Virtual Chassis |
VC-B | Global | Backup router for the Virtual Chassis |
VC-L | Global | Line-card router for the Virtual Chassis Note: The line-card role is not supported in the preprovisioned configuration for a two-member MX Series Virtual Chassis. The line-card role applies only in the context of split detection behavior. |
VC-Mm | Local | Master Routing Engine in the Virtual Chassis master router |
VC-Ms | Local | Standby Routing Engine in the Virtual Chassis master router |
VC-Bm | Local | Master Routing Engine in the Virtual Chassis backup router |
VC-Bs | Local | Standby Routing Engine in the Virtual Chassis backup router |
VC-Lm | Local | Master Routing Engine in the Virtual Chassis line-card router Note: The line-card role is not supported in the preprovisioned configuration for a two-member MX Series 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 router Note: The line-card role is not supported in the preprovisioned configuration for a two-member MX Series Virtual Chassis. The line-card role applies only in the context of split detection behavior. |
