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bgpd: propagate flood mode to zebra based on the tunnel-type in the IMET route

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IMET/type-3 routes are used by VTEPs to advertise the flood mode for BUM
traffic via the PMSI tunnel attribute. If a type-3 route is not rxed from
a remote-VTEP we default to "no-head-end-rep" for that remote-VTEP. In such
cases static-config such as PIM is likely used for BUM flooding.

Signed-off-by: Anuradha Karuppiah <anuradhak@cumulusnetworks.com>
This commit is contained in:
Anuradha Karuppiah 2019-03-19 11:29:04 -07:00
parent 833b8a504a
commit b16dd0191c
1 changed files with 26 additions and 9 deletions
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35
bgpd/bgp_evpn.c
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@ -609,7 +609,8 @@ static int bgp_zebra_send_remote_macip(struct bgp *bgp, struct bgpevpn *vpn,
* Add (update) or delete remote VTEP from zebra.
*/
static int bgp_zebra_send_remote_vtep(struct bgp *bgp, struct bgpevpn *vpn,
struct prefix_evpn *p, int add)
struct prefix_evpn *p,
int flood_control, int add)
{
struct stream *s;
@ -641,6 +642,7 @@ static int bgp_zebra_send_remote_vtep(struct bgp *bgp, struct bgpevpn *vpn,
add ? "ADD" : "DEL", vpn->vni);
return -1;
}
stream_putl(s, flood_control);
stream_putw_at(s, 0, stream_get_endp(s));
@ -889,6 +891,7 @@ static int evpn_zebra_install(struct bgp *bgp, struct bgpevpn *vpn,
{
int ret;
uint8_t flags;
int flood_control;
if (p->prefix.route_type == BGP_EVPN_MAC_IP_ROUTE) {
flags = 0;
@ -903,7 +906,20 @@ static int evpn_zebra_install(struct bgp *bgp, struct bgpevpn *vpn,
bgp, vpn, p, pi->attr->nexthop, 1, flags,
mac_mobility_seqnum(pi->attr));
} else {
ret = bgp_zebra_send_remote_vtep(bgp, vpn, p, 1);
switch (pi->attr->pmsi_tnl_type) {
case PMSI_TNLTYPE_INGR_REPL:
flood_control = VXLAN_FLOOD_HEAD_END_REPL;
break;
case PMSI_TNLTYPE_PIM_SM:
flood_control = VXLAN_FLOOD_PIM_SM;
break;
default:
flood_control = VXLAN_FLOOD_DISABLED;
break;
}
ret = bgp_zebra_send_remote_vtep(bgp, vpn, p, flood_control, 1);
}
return ret;
@ -920,7 +936,8 @@ static int evpn_zebra_uninstall(struct bgp *bgp, struct bgpevpn *vpn,
ret = bgp_zebra_send_remote_macip(bgp, vpn, p, remote_vtep_ip,
0, 0, 0);
else
ret = bgp_zebra_send_remote_vtep(bgp, vpn, p, 0);
ret = bgp_zebra_send_remote_vtep(bgp, vpn, p,
VXLAN_FLOOD_DISABLED, 0);
return ret;
}
@ -3900,12 +3917,12 @@ static int process_type3_route(struct peer *peer, afi_t afi, safi_t safi,
*/
if (attr &&
(attr->flag & ATTR_FLAG_BIT(BGP_ATTR_PMSI_TUNNEL))) {
if (attr->pmsi_tnl_type != PMSI_TNLTYPE_INGR_REPL) {
flog_warn(
EC_BGP_EVPN_PMSI_PRESENT,
"%u:%s - Rx EVPN Type-3 NLRI with unsupported PTA %d",
peer->bgp->vrf_id, peer->host,
attr->pmsi_tnl_type);
if (attr->pmsi_tnl_type != PMSI_TNLTYPE_INGR_REPL &&
attr->pmsi_tnl_type != PMSI_TNLTYPE_PIM_SM) {
flog_warn(EC_BGP_EVPN_PMSI_PRESENT,
"%u:%s - Rx EVPN Type-3 NLRI with unsupported PTA %d",
peer->bgp->vrf_id, peer->host,
attr->pmsi_tnl_type);
}
}