[{"id":3677045,"web_url":"http://patchwork.ozlabs.org/comment/3677045/","msgid":"","list_archive_url":null,"date":"2026-04-14T07:28:55","subject":"Re: [ovs-dev] [PATCH ovn v4] northd,\n ic: Add hub-spoke options to adv DR routes learned in ovn-ic.","submitter":{"id":83634,"url":"http://patchwork.ozlabs.org/api/people/83634/","name":"Ales Musil","email":"amusil@redhat.com"},"content":"On Mon, Apr 13, 2026 at 6:37 PM Lucas Vargas Dias via dev <\novs-dev@openvswitch.org> wrote:\n\n> Consider the scenario where there are 2 AZs using ovn-ic, each AZ has\n> one LR and its LS. The LRs are interconnected by a transit switch.\n> On each AZ, we can configure the dynamic routing and exchange routes\n> via BGP with external BGP speakers.\n>\n> AZ1\n> LS1 - LR1 - BGP Speaker1 - Local subnet1\n> \\\n> -----------------------\n> transit switch\n> -----------------------\n> AZ2 /\n> LS2 - LR2 - BGP Speaker2 - Local subnet2\n>\n> The LR2 will learn the subnet1 prefix via ovn-ic but this prefix will\n> not be redistributed to BGP Speaker2 and it also happens with LR1.\n> This scenario uses the network's hub-and-spoke terminology where we can\n> enable the hub-spoke on the LR for such redistribution.\n> subnet1 and subnet2 are configured as ic-source-dynamic=true in ovn-ic.\n> Also, consider the same scenario, but LR1 and LR2 learn the same subnet\n> for redundancy, hub-spoke option is disabled to not adv the subnet learned\n> from BGP and advertised in ovn-ic in BGP speakers.\n>\n> Signed-off-by: Lucas Vargas Dias \n> ---\n>\n\nHi Lucas,\n\nthank you for the v4. I have some small comments down below.\n\n\n> NEWS | 2 +\n> ic/ovn-ic.c | 20 ++++--\n> lib/ovn-util.h | 1 +\n> northd/en-advertised-route-sync.c | 2 +\n> northd/northd.c | 8 +++\n> northd/northd.h | 5 +-\n> northd/ovn-northd.c | 1 -\n> ovn-ic-sb.ovsschema | 7 ++-\n> ovn-ic-sb.xml | 14 +++--\n> ovn-nb.xml | 14 +++++\n> tests/ovn-ic.at | 101 ++++++++++++++++++++++++++++++\n> 11 files changed, 160 insertions(+), 15 deletions(-)\n>\n> diff --git a/NEWS b/NEWS\n> index 888946b54..5710716aa 100644\n> --- a/NEWS\n> +++ b/NEWS\n> @@ -52,6 +52,8 @@ OVN v26.03.0 - xxx xx xxxx\n> learned routes. This option has priority over its router\n> counterpart.\n> * The EVPN support is now considered stable. Its \"experimental\" tag\n> has\n> been removed.\n> + * Add support for hub-and-spoke propagation via the \"hub-spoke\"\n> option\n> + in dynamic-routing-redistribute settings.\n>\n\nnit: This should be in the post 26.03.0 section.\n\n - Add support for Network Function insertion in OVN with stateful\n> traffic\n> redirection capability in Logical Switch datapath. The feature\n> introduces\n> three new NB database tables:\n> diff --git a/ic/ovn-ic.c b/ic/ovn-ic.c\n> index 1aa8af9b9..9d422e25b 100644\n> --- a/ic/ovn-ic.c\n> +++ b/ic/ovn-ic.c\n> @@ -1283,6 +1283,7 @@ struct ic_route_info {\n> struct in6_addr prefix;\n> unsigned int plen;\n> struct in6_addr nexthop;\n> + bool is_src_dynamic;\n>\n\nnit: This is no longer used.\n\n\n> const char *origin;\n> const char *route_table;\n> const char *route_tag;\n> @@ -1671,7 +1672,8 @@ add_network_to_routes_ad(struct hmap *routes_ad,\n> const char *network,\n> const struct smap *nb_options,\n> const struct nbrec_logical_router *nb_lr,\n> const char *route_tag,\n> - const struct nbrec_logical_router_port *ts_lrp)\n> + const struct nbrec_logical_router_port *ts_lrp,\n> + bool is_src_dynamic)\n> {\n> struct in6_addr prefix, nexthop;\n> unsigned int plen;\n> @@ -1721,8 +1723,10 @@ add_network_to_routes_ad(struct hmap *routes_ad,\n> const char *network,\n> ds_destroy(&msg);\n> }\n>\n> + const char *origin = is_src_dynamic ? ROUTE_ORIGIN_CONNECTED_DYNAMIC :\n> + ROUTE_ORIGIN_CONNECTED;\n> /* directly-connected routes go to
route table */\n> - add_to_routes_ad(routes_ad, prefix, plen, nexthop,\n> ROUTE_ORIGIN_CONNECTED,\n> + add_to_routes_ad(routes_ad, prefix, plen, nexthop, origin,\n> NULL, nb_lrp, NULL, nb_lr, NULL, route_tag);\n> }\n>\n> @@ -2169,6 +2173,14 @@ sync_learned_routes(struct ic_context *ctx,\n> isb_route->route_table,\n> &isb_route->header_.uuid, 0);\n> if (route_learned) {\n> + if (strcmp(route_learned->origin, isb_route->origin) !=\n> 0) {\n> + VLOG_DBG(\"Update learned route %s -> %s with new\n> origin \"\n> + \"%s (old origin was %s)\",\n> + isb_route->ip_prefix, isb_route->nexthop,\n> + isb_route->origin, route_learned->origin);\n> +\n> nbrec_logical_router_static_route_update_options_setkey(\n> + route_learned->nb_route, \"origin\",\n> isb_route->origin);\n> + }\n>\n\nI think this condition can actually never happen, because thei\nic_route_find() is also checking the origin. I should have realized\nthis in the previous review sorry. So we don't need this update\nbecause if they don't match we will just re-create the NB entry.\n\n hmap_remove(&ic_lr->routes_learned, &route_learned->node);\n> free(route_learned);\n> } else {\n> @@ -2374,7 +2386,7 @@ build_ts_routes_to_adv(struct ic_context *ctx,\n> add_network_to_routes_ad(routes_ad, lrp->networks[j], lrp,\n> ts_port_addrs,\n> &nb_global->options,\n> - lr, route_tag, ts_lrp);\n> + lr, route_tag, ts_lrp, false);\n> }\n> } else {\n> /* The router port of the TS port is ignored. */\n> @@ -2429,7 +2441,7 @@ build_ts_routes_to_adv(struct ic_context *ctx,\n> add_network_to_routes_ad(routes_ad, sb_route->ip_prefix, NULL,\n> ts_port_addrs,\n> &nb_global->options,\n> - lr, route_tag, ts_lrp);\n> + lr, route_tag, ts_lrp, true);\n> }\n> sbrec_learned_route_index_destroy_row(filter);\n> }\n> diff --git a/lib/ovn-util.h b/lib/ovn-util.h\n> index 4c6623bef..4ccf6dc2d 100644\n> --- a/lib/ovn-util.h\n> +++ b/lib/ovn-util.h\n> @@ -33,6 +33,7 @@\n> #define ROUTE_ORIGIN_CONNECTED \"connected\"\n> #define ROUTE_ORIGIN_STATIC \"static\"\n> #define ROUTE_ORIGIN_LB \"loadbalancer\"\n> +#define ROUTE_ORIGIN_CONNECTED_DYNAMIC \"connected-dynamic\"\n>\n> #define ETH_CRC_LENGTH 4\n> #define ETHERNET_OVERHEAD (ETH_HEADER_LEN + ETH_CRC_LENGTH)\n> diff --git a/northd/en-advertised-route-sync.c\n> b/northd/en-advertised-route-sync.c\n> index 8b73810c7..6ae9a9689 100644\n> --- a/northd/en-advertised-route-sync.c\n> +++ b/northd/en-advertised-route-sync.c\n> @@ -683,6 +683,8 @@ should_advertise_route(const struct ovn_datapath\n> *advertising_od,\n> return drr_mode_LB_is_set(drr);\n> case ROUTE_SOURCE_CONNECTED_AS_HOST:\n> return drr_mode_CONNECTED_AS_HOST_is_set(drr);\n> + case ROUTE_SOURCE_IC_DYNAMIC:\n> + return drr_mode_IC_DYNAMIC_is_set(drr);\n> case ROUTE_SOURCE_LEARNED:\n> OVS_NOT_REACHED();\n> default:\n> diff --git a/northd/northd.c b/northd/northd.c\n> index b7239f4e2..ce80639ea 100644\n> --- a/northd/northd.c\n> +++ b/northd/northd.c\n> @@ -887,6 +887,10 @@ parse_dynamic_routing_redistribute(\n> out |= DRRM_LB;\n> continue;\n> }\n> + if (!strcmp(token, \"hub-spoke\")) {\n> + out |= DRRM_IC_DYNAMIC;\n> + continue;\n> + }\n> static struct vlog_rate_limit rl = VLOG_RATE_LIMIT_INIT(5, 1);\n> VLOG_WARN_RL(&rl,\n> \"unknown dynamic-routing-redistribute option '%s' on\n> %s\",\n> @@ -12342,6 +12346,9 @@ parsed_routes_add_static(const struct ovn_datapath\n> *od,\n> if (!strcmp(smap_get_def(&route->options, \"origin\", \"\"),\n> ROUTE_ORIGIN_CONNECTED)) {\n> source = ROUTE_SOURCE_CONNECTED;\n> + } else if (!strcmp(smap_get_def(&route->options, \"origin\", \"\"),\n> + ROUTE_ORIGIN_CONNECTED_DYNAMIC)) {\n> + source = ROUTE_SOURCE_IC_DYNAMIC;\n>\n\nnit: We are calling the smap_get_def multiple times.\n\n\n> } else {\n> source = ROUTE_SOURCE_STATIC;\n> }\n> @@ -12436,6 +12443,7 @@ route_source_to_offset(enum route_source source)\n> {\n> switch (source) {\n> case ROUTE_SOURCE_CONNECTED:\n> + case ROUTE_SOURCE_IC_DYNAMIC:\n> return ROUTE_PRIO_OFFSET_CONNECTED;\n> case ROUTE_SOURCE_STATIC:\n> return ROUTE_PRIO_OFFSET_STATIC;\n> diff --git a/northd/northd.h b/northd/northd.h\n> index 139519006..e86d39f9a 100644\n> --- a/northd/northd.h\n> +++ b/northd/northd.h\n> @@ -365,7 +365,8 @@ struct mcast_port_info {\n> DRR_MODE(CONNECTED_AS_HOST, 1) \\\n> DRR_MODE(STATIC, 2) \\\n> DRR_MODE(NAT, 3) \\\n> - DRR_MODE(LB, 4)\n> + DRR_MODE(LB, 4) \\\n> + DRR_MODE(IC_DYNAMIC, 5)\n>\n> enum dynamic_routing_redistribute_mode_bits {\n> #define DRR_MODE(PROTOCOL, BIT) DRRM_##PROTOCOL##_BIT = BIT,\n> @@ -832,6 +833,8 @@ enum route_source {\n> ROUTE_SOURCE_LB,\n> /* The route is derived from out_port of connected logical router. */\n> ROUTE_SOURCE_CONNECTED_AS_HOST,\n> + /* The route is derived from an ovn-controller and advertised to IC.\n> */\n> + ROUTE_SOURCE_IC_DYNAMIC,\n> };\n>\n> struct parsed_route {\n> diff --git a/northd/ovn-northd.c b/northd/ovn-northd.c\n> index 0ed2eb17a..cfaf2f74b 100644\n> --- a/northd/ovn-northd.c\n> +++ b/northd/ovn-northd.c\n> @@ -905,7 +905,6 @@ main(int argc, char *argv[])\n> &nbrec_load_balancer_col_external_ids,\n> &nbrec_load_balancer_health_check_col_external_ids,\n> &nbrec_logical_router_policy_col_external_ids,\n> - &nbrec_logical_router_static_route_col_external_ids,\n>\n\nnit: Leftover.\n\n\n> &nbrec_meter_col_external_ids,\n> &nbrec_meter_band_col_external_ids,\n> &nbrec_mirror_col_external_ids,\n> diff --git a/ovn-ic-sb.ovsschema b/ovn-ic-sb.ovsschema\n> index 8981a4eef..e0e0fef5e 100644\n> --- a/ovn-ic-sb.ovsschema\n> +++ b/ovn-ic-sb.ovsschema\n> @@ -1,7 +1,7 @@\n> {\n> \"name\": \"OVN_IC_Southbound\",\n> - \"version\": \"2.4.0\",\n> - \"cksum\": \"859073048 9662\",\n> + \"version\": \"2.5.0\",\n> + \"cksum\": \"1892994110 9713\",\n> \"tables\": {\n> \"IC_SB_Global\": {\n> \"columns\": {\n> @@ -116,7 +116,8 @@\n> \"origin\": {\"type\": {\"key\": {\n> \"type\": \"string\",\n> \"enum\": [\"set\",\n> - [\"connected\", \"static\", \"loadbalancer\"]]}}},\n> + [\"connected\", \"static\", \"loadbalancer\",\n> + \"connected-dynamic\"]]}}},\n> \"external_ids\": {\n> \"type\": {\"key\": \"string\", \"value\": \"string\",\n> \"min\": 0, \"max\": \"unlimited\"}}},\n> diff --git a/ovn-ic-sb.xml b/ovn-ic-sb.xml\n> index b59fe1d03..3ca115073 100644\n> --- a/ovn-ic-sb.xml\n> +++ b/ovn-ic-sb.xml\n> @@ -378,12 +378,14 @@\n> \n>\n> \n> - Can be one of connected, static or\n> - loadbalancer. Routes to directly-connected subnets -\n> - LRP's CIDRs are inserted to OVN IC SB DB with\n> connected\n> - value in . Static routes are inserted to\n> OVN IC\n> - SB DB with static value. Routes for LB VIPs are\n> inserted\n> - in OVN IC SB DB with loadbalancer value.\n> + Can be one of connected, static,\n> + connected-dynamic or loadbalancer.\n> Routes\n> + to directly-connected subnets - LRP's CIDRs are inserted to OVN\n> IC SB\n> + DB with connected value in .\n> + Static routes are inserted to OVN IC SB DB with\n> static\n>\n\nnit: Stray witespace.\n\n\n> + value. Routes for LB VIPs are inserted in OVN IC SB DB with\n> + loadbalancer value. Routes learned from dynamic\n> routing\n> + are inserted OVN IC SB DB with connected-dynamic\n> value.\n>\n\nnit: Missing \"in\".\n\n\n> Next when route is learned to another AZ NB DB by ovn-ic, route\n> origin\n> is synced to column=\"options\"\n> key=\"origin\"/>.\n> diff --git a/ovn-nb.xml b/ovn-nb.xml\n> index f1cd89509..7324e8656 100644\n> --- a/ovn-nb.xml\n> +++ b/ovn-nb.xml\n> @@ -3533,6 +3533,13 @@ or\n> Logical Switch.\n>

\n>\n> +

\n> + If hub-spoke is in the list then northd will\n> synchronize\n> + dynamic routes learned through OVN-IC from other routers into\n> the\n> + table,\n> enabling\n> + hub-and-spoke propagation.\n> +

\n> +\n>

\n> This value can be overwritten on a per LRP basis using\n> @@ -4629,6 +4636,13 @@ or\n> via shared Logical Switch.\n>

\n>\n> +

\n> + If hub-spoke is in the list then northd will\n> synchronize\n> + dynamic routes learned through OVN-IC from other routers into\n> the\n> + table,\n> enabling\n> + hub-and-spoke propagation.\n> +

\n> +\n>

\n> If not set the value from key=\"dynamic-routing-redistribute\" table=\"Logical_Router\"/> on\n> the\n> diff --git a/tests/ovn-ic.at b/tests/ovn-ic.at\n> index 8bb5a4177..50270fdda 100644\n> --- a/tests/ovn-ic.at\n> +++ b/tests/ovn-ic.at\n> @@ -4692,3 +4692,104 @@ OVS_WAIT_FOR_OUTPUT([ovn_as az2 ovn-nbctl\n> lr-route-list lr12 | grep 192.168 |\n> OVN_CLEANUP_IC([az1], [az2], [az3])\n> AT_CLEANUP\n> ])\n> +\n> +OVN_FOR_EACH_NORTHD([\n> +AT_SETUP([ovn-ic -- Check ovn-ic adv and learn from SB Learned Route -\n> hub and spoke mode])\n> +\n> +ovn_init_ic_db\n> +\n> +for i in 1 2; do\n> + ovn_start az$i\n> + ovn_as az$i\n> +\n> + # Enable route learning at AZ level\n> + check ovn-nbctl set nb_global . options:ic-route-learn=true\n> + # Enable route advertising at AZ level\n> + check ovn-nbctl set nb_global . options:ic-route-adv=true\n> +done\n> +\n> +# Create new transit switches and LRs. Test topology is next:\n> +#\n> +#\n> +# logical router (lr11) - transit switch (ts11) - logical router (lr12)\n> +#\n> +#\n> +\n> +# Create lr11, lr12 and ts11 and connect them\n> +for i in 1 2; do\n> + ovn_as az$i\n> +\n> + lr=lr1$i\n> + check ovn-nbctl lr-add $lr\n> +\n> + ts=ts11\n> + check ovn-ic-nbctl --wait=sb --may-exist ts-add $ts\n> +\n> + lrp=lrp-$lr-$ts\n> + lsp=lsp-$ts-$lr\n> + # Create LRP and connect to TS\n> + check ovn-nbctl lrp-add $lr $lrp aa:aa:aa:aa:a1:0$i 169.254.101.$i/24\n> + check ovn-nbctl lsp-add-router-port $ts $lsp $lrp\n> +done\n> +\n> +# Create directly-connected route in lr12\n> +check ovn_as az2 ovn-nbctl lrp-add lr12 lrp-lr12 aa:aa:aa:aa:bb:01 \"\n> 192.168.0.1/24\"\n> +OVS_WAIT_FOR_OUTPUT([ovn_as az1 ovn-nbctl lr-route-list lr11 | grep\n> 192.168 |\n> + grep learned | awk '{print $1, $2}' | sort ], [0], [dnl\n> +192.168.0.0/24 169.254.101.2\n> +])\n> +\n> +ovn_as az2\n> +check ovn-nbctl --wait=sb set Logical_Router lr12\n> option:dynamic-routing=true \\\n> + option:dynamic-routing-redistribute=\"connected,static\"\n> +check ovn_as az2 ovn-nbctl --wait=sb lrp-add lr12 lr12-dr1\n> 00:00:00:00:ff:01 10.0.0.1/24\n> +dr1=$(fetch_column port_binding _uuid logical_port=lr12-dr1)\n> +datapath=$(fetch_column datapath_binding _uuid external_ids:name=lr12)\n> +\n> +check_uuid ovn-sbctl create Learned_Route \\\n> + datapath=$datapath \\\n> + logical_port=$dr1 \\\n> + ip_prefix=192.168.1.0/24 \\\n> + nexthop=10.0.0.20\n> +\n> +wait_row_count ic-sb:Route 1 ip_prefix=192.168.1.0/24\n> origin=connected-dynamic\n> +\n> +# Check Learned_Route adv in ovn-ic\n> +OVS_WAIT_FOR_OUTPUT([ovn_as az1 ovn-nbctl lr-route-list lr11 |\n> + grep learned | awk '{print $1, $2}' | sort ], [0], [dnl\n> +10.0.0.0/24 169.254.101.2\n> +192.168.0.0/24 169.254.101.2\n> +192.168.1.0/24 169.254.101.2\n> +])\n> +\n> +ovn_as az1\n> +check ovn-nbctl --wait=sb set Logical_Router lr11\n> option:dynamic-routing=true \\\n> + option:dynamic-routing-redistribute=\"connected,static\"\n> +# Advertise just 10.0.0.0/24 and 192.168.0.0/24 routes\n> +check_row_count Advertised_Route 1 ip_prefix=192.168.0.0/24\n> +check_row_count Advertised_Route 1 ip_prefix=10.0.0.0/24\n> +check_row_count Advertised_Route 0 ip_prefix=192.168.1.0/24\n> +\n> +\n> +ovn_as az1\n> +check ovn-nbctl --wait=sb set Logical_Router lr11 \\\n> + option:dynamic-routing-redistribute=\"connected,static,hub-spoke\"\n> +# Advertise just 10.0.0.0/24, 192.168.0.0/24 and 192.168.1.0/24 routes\n> +# Route 192.168.1.0/24 is learned by DR from other logical routes (lr12)\n> +# And lr12 Advertised it in ovn-ic. Hub-spoke option enable re-routing in\n> lr11\n> +check_row_count Advertised_Route 1 ip_prefix=192.168.0.0/24\n> +check_row_count Advertised_Route 1 ip_prefix=10.0.0.0/24\n> +check_row_count Advertised_Route 1 ip_prefix=192.168.1.0/24\n> +\n> +ovn_as az1\n> +check ovn-nbctl --wait=sb set Logical_Router lr11 \\\n> + option:dynamic-routing-redistribute=\"connected,static\"\n> +\n> +check_row_count Advertised_Route 1 ip_prefix=192.168.0.0/24\n> +check_row_count Advertised_Route 1 ip_prefix=10.0.0.0/24\n> +check_row_count Advertised_Route 0 ip_prefix=192.168.1.0/24\n> +\n> +OVN_CLEANUP_IC([az1], [az2])\n> +\n> +AT_CLEANUP\n> +])\n> --\n> 2.43.0\n>\n>\n> --\n>\n>\n>\n>\n> _'Esta mensagem é direcionada apenas para os endereços constantes no\n> cabeçalho inicial. Se você não está listado nos endereços constantes no\n> cabeçalho, pedimos-lhe que desconsidere completamente o conteúdo dessa\n> mensagem e cuja cópia, encaminhamento e/ou execução das ações citadas\n> estão\n> imediatamente anuladas e proibidas'._\n>\n>\n> * **'Apesar do Magazine Luiza tomar\n> todas as precauções razoáveis para assegurar que nenhum vírus esteja\n> presente nesse e-mail, a empresa não poderá aceitar a responsabilidade por\n> quaisquer perdas ou danos causados por esse e-mail ou por seus anexos'.*\n>\n>\n>\n> _______________________________________________\n> dev mailing list\n> dev@openvswitch.org\n> https://mail.openvswitch.org/mailman/listinfo/ovs-dev\n>\n>\nI addressed those comments and applied it to main.\n\nRegards,\nAles","headers":{"Return-Path":"","X-Original-To":["incoming@patchwork.ozlabs.org","dev@openvswitch.org"],"Delivered-To":["patchwork-incoming@legolas.ozlabs.org","ovs-dev@lists.linuxfoundation.org"],"Authentication-Results":["legolas.ozlabs.org;\n\tdkim=fail reason=\"signature verification failed\" (1024-bit key;\n unprotected) header.d=redhat.com header.i=@redhat.com header.a=rsa-sha256\n header.s=mimecast20190719 header.b=PaIX0BVx;\n\tdkim-atps=neutral","legolas.ozlabs.org;\n spf=pass (sender SPF authorized) smtp.mailfrom=openvswitch.org\n (client-ip=2605:bc80:3010::137; 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