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bgpd: check existing l3vni for any l2vni creation

Scan all bgp vrf instances and respective L3VNI against the VNI which is being configured.

Testing Done:
Configure l3vni,
try to configure same vni as l2vni under router bgp, address-family
l2vpn evpn.
The configuration is rejected.

show evpn vni
VNI        Type VxLAN IF              # MACs   # ARPs   # Remote VTEPs Tenant VRF
4001       L3   vx-4001               0        0        n/a vrf1

TOR(config)# router bgp 5546
TOR(config-router)# address-family l2vpn evpn
TOR(config-router-af)# vni 4001
% Failed to create VNI

Signed-off-by: Chirag Shah <>
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chiragshah6 committed Aug 1, 2018
1 parent 0a4ecf2 commit 7df407eda8b501b6319f9c563ee5f72f9199d8a6
Showing with 26 additions and 0 deletions.
  1. +17 −0 bgpd/bgp_evpn.c
  2. +1 −0 bgpd/bgp_evpn_private.h
  3. +8 −0 bgpd/bgp_evpn_vty.c
@@ -4931,6 +4931,23 @@ void bgp_evpn_derive_auto_rd(struct bgp *bgp, struct bgpevpn *vpn)

* Lookup L3-VNI
bool bgp_evpn_lookup_l3vni_l2vni_table(vni_t vni)
struct list *inst = bm->bgp;
struct listnode *node;
struct bgp *bgp_vrf;

for (ALL_LIST_ELEMENTS_RO(inst, node, bgp_vrf)) {
if (bgp_vrf->l3vni == vni)
return true;

return false;

* Lookup VNI.
@@ -503,4 +503,5 @@ extern struct evpnes *bgp_evpn_lookup_es(struct bgp *bgp, esi_t *esi);
extern struct evpnes *bgp_evpn_es_new(struct bgp *bgp, esi_t *esi,
struct ipaddr *originator_ip);
extern void bgp_evpn_es_free(struct bgp *bgp, struct evpnes *es);
extern bool bgp_evpn_lookup_l3vni_l2vni_table(vni_t vni);
#endif /* _BGP_EVPN_PRIVATE_H */
@@ -1888,6 +1888,14 @@ static struct bgpevpn *evpn_create_update_vni(struct bgp *bgp, vni_t vni)

vpn = bgp_evpn_lookup_vni(bgp, vni);
if (!vpn) {
/* Check if this L2VNI is already configured as L3VNI */
if (bgp_evpn_lookup_l3vni_l2vni_table(vni)) {
"%u: Failed to create L2VNI %u, it is configured as L3VNI",
bgp->vrf_id, vni);
return NULL;

/* tenant vrf will be updated when we get local_vni_add from
* zebra

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