diff --git a/e2etests/tests/session.go b/e2etests/tests/session.go
index 7f56fa4c..46251525 100644
--- a/e2etests/tests/session.go
+++ b/e2etests/tests/session.go
@@ -263,5 +263,70 @@ var _ = ginkgo.Describe("Session", func() {
 			ginkgo.Entry("IPV4", ipfamily.IPv4),
 			ginkgo.Entry("IPV6", ipfamily.IPv6),
 		)
+
+		ginkgo.DescribeTable("Establishes sessions with dynamicASN", func(family ipfamily.Family) {
+			frrs := config.ContainersForVRF(infra.FRRContainers, "")
+			neighbors := []frrk8sv1beta1.Neighbor{}
+
+			for _, f := range frrs {
+				addresses := f.AddressesForFamily(family)
+				ebgpMultihop := false
+				if f.NeighborConfig.MultiHop && f.NeighborConfig.ASN != f.RouterConfig.ASN {
+					ebgpMultihop = true
+				}
+
+				dynamicASN := frrk8sv1beta1.InternalASNMode
+				if f.RouterConfig.ASN != infra.FRRK8sASN {
+					dynamicASN = frrk8sv1beta1.ExternalASNMode
+				}
+
+				for _, address := range addresses {
+					neighbors = append(neighbors, frrk8sv1beta1.Neighbor{
+						DynamicASN:   dynamicASN,
+						Address:      address,
+						Password:     f.RouterConfig.Password,
+						Port:         &f.RouterConfig.BGPPort,
+						EBGPMultiHop: ebgpMultihop,
+					})
+				}
+			}
+
+			config := frrk8sv1beta1.FRRConfiguration{
+				ObjectMeta: metav1.ObjectMeta{
+					Name:      "test",
+					Namespace: k8s.FRRK8sNamespace,
+				},
+				Spec: frrk8sv1beta1.FRRConfigurationSpec{
+					BGP: frrk8sv1beta1.BGPConfig{
+						Routers: []frrk8sv1beta1.Router{
+							{
+								ASN:       infra.FRRK8sASN,
+								VRF:       "",
+								Neighbors: neighbors,
+							},
+						},
+					},
+				},
+			}
+
+			ginkgo.By("pairing with nodes")
+			for _, c := range frrs {
+				err := frrcontainer.PairWithNodes(cs, c, family)
+				Expect(err).NotTo(HaveOccurred())
+			}
+
+			err := updater.Update([]corev1.Secret{}, config)
+			Expect(err).NotTo(HaveOccurred())
+
+			nodes, err := k8s.Nodes(cs)
+			Expect(err).NotTo(HaveOccurred())
+
+			for _, c := range frrs {
+				ValidateFRRPeeredWithNodes(nodes, c, family)
+			}
+		},
+			ginkgo.Entry("IPV4", ipfamily.IPv4),
+			ginkgo.Entry("IPV6", ipfamily.IPv6),
+		)
 	})
 })
diff --git a/e2etests/tests/webhooks.go b/e2etests/tests/webhooks.go
index ad2873db..46ac01e4 100644
--- a/e2etests/tests/webhooks.go
+++ b/e2etests/tests/webhooks.go
@@ -88,6 +88,7 @@ var _ = ginkgo.Describe("Webhooks", func() {
 							ASN: 100,
 							Neighbors: []frrk8sv1beta1.Neighbor{
 								{
+									ASN:     100,
 									Address: "192.a.b.10",
 								},
 							},
@@ -102,6 +103,7 @@ var _ = ginkgo.Describe("Webhooks", func() {
 						{
 							Neighbors: []frrk8sv1beta1.Neighbor{
 								{
+									ASN:     100,
 									Address: "1.2.3.4",
 									ToAdvertise: frrk8sv1beta1.Advertise{
 										PrefixesWithLocalPref: []frrk8sv1beta1.LocalPrefPrefixes{
@@ -118,6 +120,36 @@ var _ = ginkgo.Describe("Webhooks", func() {
 				},
 				"localPref associated to non existing prefix",
 			),
+			ginkgo.Entry("both asn and dynamicASN not specified",
+				func(cfg *frrk8sv1beta1.FRRConfiguration) {
+					cfg.Spec.BGP.Routers = []frrk8sv1beta1.Router{
+						{
+							Neighbors: []frrk8sv1beta1.Neighbor{
+								{
+									Address: "1.2.3.4",
+								},
+							},
+						},
+					}
+				},
+				"has no ASN or DynamicASN specified",
+			),
+			ginkgo.Entry("both asn and dynamicASN specified",
+				func(cfg *frrk8sv1beta1.FRRConfiguration) {
+					cfg.Spec.BGP.Routers = []frrk8sv1beta1.Router{
+						{
+							Neighbors: []frrk8sv1beta1.Neighbor{
+								{
+									ASN:        100,
+									DynamicASN: frrk8sv1beta1.ExternalASNMode,
+									Address:    "1.2.3.4",
+								},
+							},
+						},
+					}
+				},
+				"has both ASN and DynamicASN specified",
+			),
 		)
 
 		ginkgo.It("Should reject create/update when there is a conflict with an existing config", func() {