SR OS supports Long-Lived Graceful Restart (LLGR). LLGR is supported for the same address families as normal GR, as described in BGP graceful restart.
The LLGR procedures adhere to draft-uttaro-idr-bgp-persistence-03. LLGR is intended to handle more serious and longer-term outages than ordinary GR.
SR OS routers support LLGR in the context of both the restarting router (which experienced a restart or failure) and the helper or receiving router (which is a peer of the failed router). Both functionalities are enabled and disabled at the same time by adding the long-lived command under a graceful-restart configuration context.
When long-lived is applied to a session (and capability negotiation is not disabled), the OPEN message sent to the peer includes both the GR capability and the LLGR capability. Both capabilities list the same set of AFI/SAFI.