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BGP: Fix BFD/GR interaction

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The old code does not cause GR if BFD failed when GR is running,
session is re-established but not yet synchronized.
This commit is contained in:
Ondrej Zajicek (work) 2018-08-01 17:41:29 +02:00
parent 4abccabd7b
commit b1f6c439f5
1 changed files with 10 additions and 9 deletions
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19
proto/bgp/bgp.c
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@ -1054,22 +1054,23 @@ bgp_bfd_notify(struct bfd_request *req)
if (req->down && ((ps == PS_START) || (ps == PS_UP)))
{
BGP_TRACE(D_EVENTS, "BFD session down");
bgp_store_error(p, NULL, BE_MISC, BEM_BFD_DOWN);
/* Ignore if already in GR */
if (p->gr_active && (p->cf->bfd == BGP_BFD_GRACEFUL))
return;
if (p->conn && (p->conn->state == BS_ESTABLISHED) &&
p->gr_ready && (p->cf->bfd == BGP_BFD_GRACEFUL))
if (p->cf->bfd == BGP_BFD_GRACEFUL)
{
/* Trigger graceful restart */
bgp_handle_graceful_restart(p);
bgp_conn_enter_idle_state(p->conn);
if (p->conn && (p->conn->state == BS_ESTABLISHED) && p->gr_ready)
bgp_handle_graceful_restart(p);
if (p->incoming_conn.state > BS_IDLE)
bgp_conn_enter_idle_state(&p->incoming_conn);
if (p->outgoing_conn.state > BS_IDLE)
bgp_conn_enter_idle_state(&p->outgoing_conn);
}
else
{
/* Trigger session down */
bgp_store_error(p, NULL, BE_MISC, BEM_BFD_DOWN);
if (ps == PS_UP)
bgp_update_startup_delay(p);
bgp_stop(p, 0, NULL, 0);