diff --git a/.changelog/3045.txt b/.changelog/3045.txt
new file mode 100644
index 0000000000..2f66471216
--- /dev/null
+++ b/.changelog/3045.txt
@@ -0,0 +1,3 @@
+```release-note:enhancement
+compute: added additional validation to `google_cloud_router`'s `bgp.asn` field.
+```
diff --git a/google-beta/resource_compute_router.go b/google-beta/resource_compute_router.go
index 6033404950..72a4f9e0c5 100644
--- a/google-beta/resource_compute_router.go
+++ b/google-beta/resource_compute_router.go
@@ -70,8 +70,9 @@ except the last character, which cannot be a dash.`,
 				Elem: &schema.Resource{
 					Schema: map[string]*schema.Schema{
 						"asn": {
-							Type:     schema.TypeInt,
-							Required: true,
+							Type:         schema.TypeInt,
+							Required:     true,
+							ValidateFunc: validateRFC6996Asn,
 							Description: `Local BGP Autonomous System Number (ASN). Must be an RFC6996
 private ASN, either 16-bit or 32-bit. The value will be fixed for
 this router resource. All VPN tunnels that link to this router
diff --git a/google-beta/validation.go b/google-beta/validation.go
index 7ce1ccd209..2a66e65fef 100644
--- a/google-beta/validation.go
+++ b/google-beta/validation.go
@@ -61,6 +61,14 @@ var (
 
 	ProjectNameInDNSFormRegex = "[-a-z0-9\\.]{1,63}"
 	ProjectNameRegex          = "^[A-Za-z0-9-'\"\\s!]{4,30}$"
+
+	// Valid range for Cloud Router ASN values as per RFC6996
+	// https://tools.ietf.org/html/rfc6996
+	Rfc6996Asn16BitMin  = 64512
+	Rfc6996Asn16BitMax  = 65534
+	Rfc6996Asn32BitMin  = 4200000000
+	Rfc6996Asn32BitMax  = 4294967294
+	GcpRouterPartnerAsn = 16550
 )
 
 var rfc1918Networks = []string{
@@ -74,6 +82,19 @@ func validateGCPName(v interface{}, k string) (ws []string, errors []error) {
 	return validateRegexp(re)(v, k)
 }
 
+// Ensure that the BGP ASN value of Cloud Router is a valid value as per RFC6996 or a value of 16550
+func validateRFC6996Asn(v interface{}, k string) (ws []string, errors []error) {
+	value := v.(int)
+	if !(value >= Rfc6996Asn16BitMin && value <= Rfc6996Asn16BitMax) &&
+		!(value >= Rfc6996Asn32BitMin && value <= Rfc6996Asn32BitMax) &&
+		value != GcpRouterPartnerAsn {
+		errors = append(errors, fmt.Errorf(`expected %q to be a RFC6996-compliant Local ASN:
+must be either in the private ASN ranges: [64512..65534], [4200000000..4294967294];
+or be the value of [%d], got %d`, k, GcpRouterPartnerAsn, value))
+	}
+	return
+}
+
 func validateRegexp(re string) schema.SchemaValidateFunc {
 	return func(v interface{}, k string) (ws []string, errors []error) {
 		value := v.(string)