diff --git a/inventory/sample/group_vars/k8s_cluster/k8s-net-kube-router.yml b/inventory/sample/group_vars/k8s_cluster/k8s-net-kube-router.yml
index 383280187..e96963345 100644
--- a/inventory/sample/group_vars/k8s_cluster/k8s-net-kube-router.yml
+++ b/inventory/sample/group_vars/k8s_cluster/k8s-net-kube-router.yml
@@ -26,6 +26,9 @@
 # https://github.com/cloudnativelabs/kube-router/blob/master/docs/user-guide.md
 # kube_router_extra_args: []
 
+# ASN number of the cluster, used when communicating with external BGP routers
+# kube_router_cluster_asn: ~
+
 # ASN numbers of the BGP peer to which cluster nodes will advertise cluster ip and node's pod cidr.
 # kube_router_peer_router_asns: ~
 
diff --git a/roles/network_plugin/kube-router/defaults/main.yml b/roles/network_plugin/kube-router/defaults/main.yml
index 441d80842..886377b31 100644
--- a/roles/network_plugin/kube-router/defaults/main.yml
+++ b/roles/network_plugin/kube-router/defaults/main.yml
@@ -25,6 +25,9 @@ kube_router_enable_dsr: false
 # https://github.com/cloudnativelabs/kube-router/blob/master/docs/user-guide.md
 kube_router_extra_args: []
 
+# ASN number of the cluster, used when communicating with external BGP routers
+kube_router_cluster_asn: ~
+
 # ASN numbers of the BGP peer to which cluster nodes will advertise cluster ip and node's pod cidr.
 kube_router_peer_router_asns: ~
 
diff --git a/roles/network_plugin/kube-router/templates/kube-router.yml.j2 b/roles/network_plugin/kube-router/templates/kube-router.yml.j2
index e24715d1c..ab677abc8 100644
--- a/roles/network_plugin/kube-router/templates/kube-router.yml.j2
+++ b/roles/network_plugin/kube-router/templates/kube-router.yml.j2
@@ -49,6 +49,9 @@ spec:
 {% if kube_router_advertise_loadbalancer_ip %}
         - --advertise-loadbalancer-ip
 {% endif %}
+{% if kube_router_cluster_asn %}
+        - --cluster-asn={{ kube_router_cluster_asn }}
+{% endif %}
 {% if kube_router_peer_router_asns %}
         - --peer-router-asns={{ kube_router_peer_router_asns }}
 {% endif %}