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ospf: optimization for FRR's P2MP mode

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FRR implements a non-standard, but compatible approach for
	sending update LSAs (it always send to 224.0.0.5) on P2MP
	interfaces. This change makes it so acks are also sent to
	224.0.0.5.

	Since the acks are multicast, this allows an optimization
	where we don't send back out the incoming P2MP interface
	immediately allow time to rx multicast ack from neighbors
	on the same net that rx'ed the original (multicast) update.

Signed-off-by: Lou Berger <lberger@labn.net>
This commit is contained in:
Lou Berger 2022-10-21 20:35:13 +00:00
parent 675ba67d89
commit c706f0e32b
2 changed files with 9 additions and 1 deletions
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7
ospfd/ospf_flood.c
View File

@ -648,6 +648,13 @@ int ospf_flood_through_interface(struct ospf_interface *oi,
OSPF_SEND_PACKET_DIRECT);
}
} else
/* Optimization: for P2MP interfaces,
don't send back out the incoming interface immediately,
allow time to rx multicast ack to the rx'ed (multicast)
update */
if (retx_flag != 1 ||
oi->type != OSPF_IFTYPE_POINTOMULTIPOINT || inbr == NULL ||
oi != inbr->oi)
ospf_ls_upd_send_lsa(oi->nbr_self, lsa,
OSPF_SEND_PACKET_INDIRECT);

3
ospfd/ospf_packet.c
View File

@ -4220,7 +4220,8 @@ static void ospf_ls_ack_send_list(struct ospf_interface *oi, struct list *ack,
op->length = length;
/* Decide destination address. */
if (oi->type == OSPF_IFTYPE_POINTOPOINT)
if (oi->type == OSPF_IFTYPE_POINTOPOINT ||
oi->type == OSPF_IFTYPE_POINTOMULTIPOINT)
op->dst.s_addr = htonl(OSPF_ALLSPFROUTERS);
else
op->dst.s_addr = dst.s_addr;