Update is_lb_listener.html.markdown

website/docs/r/is_lb_listener.html.markdown

@@ -61,7 +61,7 @@ resource "ibm_is_lb_listener" "lb_listener1"{
   lb       = ibm_is_lb.lb2.id
   port     = "9086"
   protocol = "https"
-  certificate_instance="crn:v1:staging:public:cloudcerts:us-south:a2d1bace7b46e4815a81e52c6ffeba5cf:af925157-b125-4db2-b642-adacb8b9c7f5:certificate:c81627a1bf6f766379cc4b98fd2a44ed"
+  certificate_instance="crn:v1:bluemix:public:cloudcerts:us-south:a2d1bace7b46e4815a81e52c6ffeba5cf:af925157-b125-4db2-b642-adacb8b9c7f5:certificate:c81627a1bf6f766379cc4b98fd2a44ed"
 }
 
 resource "ibm_is_lb_listener" "lb_listener2"{
@@ -74,6 +74,35 @@ resource "ibm_is_lb_listener" "lb_listener2"{
 }
 ```
 
+### Sample to create a load balancer listener for a route mode enabled private network load balancer.
+
+```terraform
+
+resource "ibm_is_vpc" "vpc" {
+  name = "test-vpc"
+}
+
+resource "ibm_is_subnet" "subnet" {
+  name 			= "test-subnet"
+  vpc 			= "${ibm_is_vpc.vpc.id}"
+  zone 			= "us-south-2"
+  ipv4_cidr_block = "10.240.68.0/24"
+}
+
+resource "ibm_is_lb" "nlb" {
+  name           = "test-nlb"
+  subnets        = [ibm_is_subnet.subnet.id]
+  profile        = "network-fixed"
+  type           = "private"
+  route_mode     = "true"
+}
+
+resource "ibm_is_lb_listener" "nlbHttpListener1" {
+  lb           = ibm_is_lb.nlb.id
+  protocol     = "tcp"
+}
+```
+
 ## Timeouts
 The `ibm_is_lb_listener` resource provides the following [Timeouts](https://www.terraform.io/docs/language/resources/syntax.html) configuration options:
 
@@ -90,6 +119,7 @@ Review the argument references that you can specify for your resource.
 - `port`- (Optional, Depreciated Integer) The listener port number. Valid range 1 to 65535.
   **NOTE**:
   - Private network load balancers with `route_mode` enabled don't support `port`, they support `port` range from `port_min`(1) - `port_max`(65535).
+  - Only accepted value of `port` for `route_mode` enabled private network load balancer is `1`. Any other value will show change/update-in-place and return an error.
 
 - `protocol` - (Required, String) The listener protocol. Enumeration type are `http`, `tcp`, and `https`. Network load balancer supports only `tcp` protocol.
 - `default_pool` - (Optional, String) The load balancer pool unique identifier.