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DES-7200 Configuration Guide Chapter 3 MPLS Reliability Configuration
3-1
3 MPLS Reliability
Configuration
3.1 MPLS GR Configuration
3.1.1 LDP GR Configuration
3.1.1.1 Introduction to LDP GR
Overview
IETF has expanded the MPLS signaling protocol of LDP. When the LDP protocol of certain
device restarts, the neighboring devices can be advertised to retain MPLS forwarding data
related to this device within a certain period and mark them as "stale". After restart of LDP
protocol, the neighboring devices will help with message synchronization so that the device can
restore to the state before restart within the shortest time. During the whole process of LDP
restart, the packet forwarding path remains unchanged, and the entire system can forward data
in a non-stop way, providing high reliability for various application services of MPLS.
Basic concepts of LDP GR
GR routers by capability
In terms of GR capability, there are GR-Capable router, GR-Aware router and GR-Unaware
router.
GR-Capable router
The router with GR capability. Generally, such router has dual management boards (1+1
redundancy). During main-slave management board switchover, it can advertise its adjacent
neighbors to keep its forwarding data and then rebuild the routing table after switchover without
causing route oscillation. The packet forwarding path remains unchanged, and the entire system
can forward data in a non-stop way.
GR-Aware router