Graceful Restart on the Receiving Switch

During session startup, BGP peers indicate whether they have the graceful restart capability. When BGP restarts, the receiving router retains routes received from the restarting router and marks those routes stale. The receiving router continues to advertise the restarting router as if it was fully functional until one of the following events occurs:

• The restarting router sends the EOR marker, indicating the end of a routing update and the end of the graceful restart.
• The restart timer defined by the restarting router expires.
• The stale-route-time timer defined on the receiving router expires.