feat: Add ability to specify MTU for vlan_attachment submodule. (#29)

* Add ability to specify MTU
for vlan_attachment submodule.

* Updated Docs to include new mtu variable

Author: steffencircle

modules/interconnect_attachment/README.md

@@ -9,6 +9,7 @@
 | description | An optional description of this resource | `string` | `null` | no |
 | interconnect | URL of the underlying Interconnect object that this attachment's traffic will traverse through. | `string` | n/a | yes |
 | interface | Interface to deploy for this attachment. | `any` | n/a | yes |
+| mtu | Maximum Transmission Unit (MTU), in bytes, of packets passing through this interconnect attachment. Currently, only 1440 and 1500 are allowed. If not specified, the value will default to 1440. | `string` | `null` | no |
 | name | The name of the interconnect attachment | `string` | n/a | yes |
 | peer | BGP Peer for this attachment. | `any` | n/a | yes |
 | project | The project ID to deploy to | `string` | n/a | yes |

modules/interconnect_attachment/main.tf

@@ -24,6 +24,7 @@ resource "google_compute_interconnect_attachment" "attachment" {
   type              = var.type
   description       = var.description
   bandwidth         = var.bandwidth
+  mtu               = var.mtu
   candidate_subnets = var.candidate_subnets
   vlan_tag8021q     = var.vlan_tag8021q
 }

modules/interconnect_attachment/variables.tf

@@ -57,6 +57,12 @@ variable "bandwidth" {
   default     = "BPS_10G"
 }
 
+variable "mtu" {
+  type        = string
+  description = "Maximum Transmission Unit (MTU), in bytes, of packets passing through this interconnect attachment. Currently, only 1440 and 1500 are allowed. If not specified, the value will default to 1440."
+  default     = null
+}
+
 variable "description" {
   type        = string
   description = "An optional description of this resource"