diff --git a/doc/bird.sgml b/doc/bird.sgml
index ffc22218..aa16c227 100644
--- a/doc/bird.sgml
+++ b/doc/bird.sgml
@@ -4826,6 +4826,11 @@ specify both channels.
         suppresses updating this value by a cache server.
         Default: 7200 seconds
 
+	<tag>ignore max length <m/switch/</tag>
+	Ignore received max length in ROA records and use max value (32 or 128)
+	instead. This may be useful for implementing loose RPKI check for
+	blackholes. Default: disabled.
+
         <tag>transport tcp</tag> Unprotected transport over TCP. It's a default
         transport. Should be used only on secure private networks.
         Default: tcp
diff --git a/proto/rpki/config.Y b/proto/rpki/config.Y
index 924066f8..d6d326b8 100644
--- a/proto/rpki/config.Y
+++ b/proto/rpki/config.Y
@@ -32,7 +32,7 @@ rpki_check_unused_transport(void)
 CF_DECLS
 
 CF_KEYWORDS(RPKI, REMOTE, BIRD, PRIVATE, PUBLIC, KEY, TCP, SSH, TRANSPORT, USER,
-	    RETRY, REFRESH, EXPIRE, KEEP)
+	    RETRY, REFRESH, EXPIRE, KEEP, IGNORE, MAX, LENGTH)
 
 %type <i> rpki_keep_interval
 
@@ -79,6 +79,7 @@ rpki_proto_item:
      RPKI_CFG->expire_interval = $3;
      RPKI_CFG->keep_expire_interval = $2;
    }
+ | IGNORE MAX LENGTH bool { RPKI_CFG->ignore_max_length = $4; }
  ;
 
 rpki_keep_interval:
diff --git a/proto/rpki/packets.c b/proto/rpki/packets.c
index e9d24fb8..dd11f997 100644
--- a/proto/rpki/packets.c
+++ b/proto/rpki/packets.c
@@ -729,12 +729,22 @@ rpki_prefix_pdu_2_net_addr(const struct pdu_header *pdu, net_addr_union *n)
 static int
 rpki_handle_prefix_pdu(struct rpki_cache *cache, const struct pdu_header *pdu)
 {
+  const struct rpki_config *cf = (void *) cache->p->p.cf;
+
   const enum pdu_type type = pdu->type;
   ASSERT(type == IPV4_PREFIX || type == IPV6_PREFIX);
 
   net_addr_union addr = {};
   rpki_prefix_pdu_2_net_addr(pdu, &addr);
 
+  if (cf->ignore_max_length)
+  {
+    if (type == IPV4_PREFIX)
+      addr.roa4.max_pxlen = IP4_MAX_PREFIX_LENGTH;
+    else
+      addr.roa6.max_pxlen = IP6_MAX_PREFIX_LENGTH;
+  }
+
   struct channel *channel = NULL;
 
   if (type == IPV4_PREFIX)
diff --git a/proto/rpki/rpki.c b/proto/rpki/rpki.c
index 3e46b6d1..3ee46ae2 100644
--- a/proto/rpki/rpki.c
+++ b/proto/rpki/rpki.c
@@ -639,18 +639,6 @@ rpki_shutdown(struct proto *P)
  * 	RPKI Reconfiguration
  */
 
-static int
-rpki_try_fast_reconnect(struct rpki_cache *cache)
-{
-  if (cache->state == RPKI_CS_ESTABLISHED)
-  {
-    rpki_cache_change_state(cache, RPKI_CS_FAST_RECONNECT);
-    return SUCCESSFUL_RECONF;
-  }
-
-  return NEED_RESTART;
-}
-
 /**
  * rpki_reconfigure_cache - a cache reconfiguration
  * @p: RPKI protocol instance
@@ -666,6 +654,7 @@ rpki_try_fast_reconnect(struct rpki_cache *cache)
 static int
 rpki_reconfigure_cache(struct rpki_proto *p UNUSED, struct rpki_cache *cache, struct rpki_config *new, struct rpki_config *old)
 {
+  u8 try_reset = 0;
   u8 try_fast_reconnect = 0;
 
   if (strcmp(old->hostname, new->hostname) != 0)
@@ -685,6 +674,13 @@ rpki_reconfigure_cache(struct rpki_proto *p UNUSED, struct rpki_cache *cache, st
     CACHE_TRACE(D_EVENTS, cache, "Transport type changed");
     return NEED_RESTART;
   }
+
+  if (old->ignore_max_length != new->ignore_max_length)
+  {
+    CACHE_TRACE(D_EVENTS, cache, "Ignore max length changed");
+    try_reset = 1;
+  }
+
 #if HAVE_LIBSSH
   else if (new->tr_config.type == RPKI_TR_SSH)
   {
@@ -713,8 +709,26 @@ rpki_reconfigure_cache(struct rpki_proto *p UNUSED, struct rpki_cache *cache, st
   TEST_INTERVAL(expire, Expire);
 #undef TEST_INTERVAL
 
-  if (try_fast_reconnect)
-    return rpki_try_fast_reconnect(cache);
+  if (try_reset || try_fast_reconnect)
+  {
+    if (cache->state != RPKI_CS_ESTABLISHED)
+      return NEED_RESTART;
+
+    if (try_reset && !try_fast_reconnect)
+      rpki_cache_change_state(cache, RPKI_CS_RESET);
+
+    if (try_fast_reconnect)
+    {
+      if (try_reset)
+      {
+	/* Force reset during reconnect */
+	cache->request_session_id = 1;
+	cache->serial_num = 0;
+      }
+
+      rpki_cache_change_state(cache, RPKI_CS_FAST_RECONNECT);
+    }
+  }
 
   return SUCCESSFUL_RECONF;
 }
diff --git a/proto/rpki/rpki.h b/proto/rpki/rpki.h
index 8972b33a..8a5c38fd 100644
--- a/proto/rpki/rpki.h
+++ b/proto/rpki/rpki.h
@@ -125,6 +125,7 @@ struct rpki_config {
   u8 keep_refresh_interval:1;		/* Do not overwrite refresh interval by cache server update */
   u8 keep_retry_interval:1;		/* Do not overwrite retry interval by cache server update */
   u8 keep_expire_interval:1;		/* Do not overwrite expire interval by cache server update */
+  u8 ignore_max_length:1;		/* Ignore received max length and use MAX_PREFIX_LENGTH instead */
 };
 
 void rpki_check_config(struct rpki_config *cf);