/**
* bgp_refresh_begin - start incoming enhanced route refresh sequence
* @p: BGP instance
*
* This function is called when an incoming enhanced route refresh sequence is
* started by the neighbor, demarcated by the BoRR packet. The function updates
* the load state and starts the routing table refresh cycle. Note that graceful
* restart also uses routing table refresh cycle, but RFC 7313 and load states
* ensure that these two sequences do not overlap.
*/
void
bgp_refresh_begin(struct bgp_proto *p)
{
if (p->load_state == BFS_LOADING)
{ log(L_WARN "%s: BEGIN-OF-RR received before END-OF-RIB, ignoring", p->p.name); return; }
p->load_state = BFS_REFRESHING;
rt_refresh_begin(p->p.main_ahook->table, p->p.main_ahook);
}
/**
* bgp_handle_graceful_restart - handle detected BGP graceful restart
* @p: BGP instance
*
* This function is called when a BGP graceful restart of the neighbor is
* detected (when the TCP connection fails or when a new TCP connection
* appears). The function activates processing of the restart - starts routing
* table refresh cycle and activates BGP restart timer. The protocol state goes
* back to %PS_START, but changing BGP state back to %BS_IDLE is left for the
* caller.
*/
void
bgp_handle_graceful_restart(struct bgp_proto *p)
{
ASSERT(p->conn && (p->conn->state == BS_ESTABLISHED) && p->gr_ready);
BGP_TRACE(D_EVENTS, "Neighbor graceful restart detected%s",
p->gr_active ? " - already pending" : "");
proto_notify_state(&p->p, PS_START);
if (p->gr_active)
rt_refresh_end(p->p.main_ahook->table, p->p.main_ahook);
p->gr_active = 1;
bgp_start_timer(p->gr_timer, p->conn->peer_gr_time);
rt_refresh_begin(p->p.main_ahook->table, p->p.main_ahook);
}
