What does GR mean?

Gr is GR motor sports, abbreviated as GRMS or GR, and its technology comes from the brand of automobile performance modification parts of the racing department.

GR is the abbreviation of Graceful Restart, which is a mechanism to ensure the uninterrupted forwarding service when the protocol is restarted. After the protocol is restarted, the peripheral device assists it in synchronizing information (including various topology, routing and session information maintained by GR-supporting routing /MPLS related protocols).

The devices with GR function in the extended data are called GR-enabled devices. The equipment with GR capability can restart smoothly when the protocol is restarted, so as to ensure uninterrupted forwarding service; When the protocol is restarted, the equipment without GR capability can only follow the normal restart process. The basic concepts involved in GR are as follows:

1. Restarter

GR restart router refers to a device that is restarted by an administrator or a protocol triggered by a fault, and must have GR capability.

2.GRHelper

That is, the neighbor of the GR restater can help the restarted GR restater maintain the stability of the routing relationship, and must also have GR capability.

3.GRSession

GR session is a negotiation process between GR restarter and GR helper. Including protocol restart notification, information interaction during protocol restart, etc. Through this session, GR restarters and GR helpers can master each other's GR capabilities.

References:

GR (abbreviation for smooth restart of communication technology) Baidu Encyclopedia