Graceful Routing Engine Switchover Overview

The Graceful Routing Engine switchover (GRES) feature in the Junos OS enables a routing platform with redundant Routing Engines to continue forwarding packets even if one Routing Engine fails. GRES preserves interface and kernel information. Traffic is not interrupted. For more information, on GRES, see the Junos High Availability Configuration Guide.

• To configure GRES on the JCS1200 platform, include the graceful-switchover statement at the [edit chassis redundancy routing-engine] hierarchy level on the PSD.
• Configure the graceful-switchover statement for all PSDs on the JCS1200 platform that include redundant Routing Engines.

Graceful Routing Engine Switchover PIC Support

Junos OS Release 10.0 or higher supports GRES for PICs running on the JCS1200 platform, including IQ2 PICs. IQ2 PICs supported on the JCS1200 platform include 1-, 4-, and 8-port Gigabit Ethernet IQ2 PICs and 1-port 10-Gigabit Ethernet IQ2 PICs.