Add support for IPv6 prefix exchange in google_compute_router_peer

[bcleenders]

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Description

We'd like to enable IPv6, and one of the steps is configuring our BGP sessions to exchange ipv6 prefixes.

This is related to #13752 - both are required to set up a VPN and use it for IPv6 traffic.

New or Affected Resource(s)

• google_compute_router_peer

Potential Terraform Configuration

resource "google_compute_router_peer" "peer" {
  name                      = "my-router-peer"
  router                    = "my-router"
  region                    = "us-central1"
  peer_ip_address           = "169.254.1.2"
  peer_asn                  = 65513
  advertised_route_priority = 100
  interface                 = "interface-1"
  
  # New fields:
  enable_ipv6               = true
  ipv6_nexthop_address      = "2600:2d00:0000:0002:0000:0000:0000:0001"
  peer_ipv6_nexthop_address = "2600:2d00:0:3::1" # short notation
}

Restrictions:

• The nexthop fields can only be set if ipv6 is enabled
• Either both nexthop fields must be set, or neither (defaults to automatic config)
• Both nexthop fields must be in 2600:2d00:0:2::/64 or 2600:2d00:0:3::/64 range (see second documentation link below, not listed as part of API).

References

• Router API config which shows the field names.
• documentation on enabling IPv6 for VPNs

• Resource google_compute_ha_vpn_gateway is missing option to create an ipv6/dual stack vpn gateway #13752

[600lyy]

I am on it.

GoogleCloudPlatform/magic-modules#7583

[600lyy]

The PR has been successfully merged.
GoogleCloudPlatform/magic-modules#7583

[shuyama1]

Closing the issue as GoogleCloudPlatform/magic-modules#7583 is merged. Thanks for the work @600lyy!

[github-actions]

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