Add network NVA NCC stage

fast/stages/2-networking-a-peering/README.md

@@ -72,13 +72,13 @@ As mentioned initially, there are of course other ways to implement internal con
 
 This is a summary of the main options:
 
-- [HA VPN](https://cloud.google.com/network-connectivity/docs/vpn/concepts/topologies) (implemented by [2-networking-vpn](../2-networking-b-vpn/))
+- [HA VPN](https://cloud.google.com/network-connectivity/docs/vpn/concepts/topologies) (implemented by [2-networking-b-vpn](../2-networking-b-vpn/))
   - Pros: simple compatibility with GCP services that leverage peering internally, better control on routes, avoids peering groups shared quotas and limits
   - Cons: additional cost, marginal increase in latency, requires multiple tunnels for full bandwidth
 - [VPC Peering](https://cloud.google.com/vpc/docs/vpc-peering) (implemented here)
   - Pros: no additional costs, full bandwidth with no configurations, no extra latency, total environment isolation
   - Cons: no transitivity (e.g. to GKE masters, Cloud SQL, etc.), no selective exchange of routes, several quotas and limits shared between VPCs in a peering group
-- [Multi-NIC appliances](https://cloud.google.com/architecture/best-practices-vpc-design#multi-nic) (implemented by [2-networking-nva](../2-networking-c-nva/))
+- [Multi-NIC appliances](https://cloud.google.com/architecture/best-practices-vpc-design#multi-nic) (implemented by [2-networking-c-nva](../2-networking-c-nva/) and [2-networking-e-nva-bgp](../2-networking-e-nva-bgp/))
   - Pros: additional security features (e.g. IPS), potentially better integration with on-prem systems by using the same vendor
   - Cons: complex HA/failover setup, limited by VM bandwidth and scale, additional costs for VMs and licenses, out of band management of a critical cloud component
 

fast/stages/2-networking-b-vpn/README.md

@@ -73,10 +73,10 @@ This is a summary of the main options:
 - [HA VPN](https://cloud.google.com/network-connectivity/docs/vpn/concepts/topologies) (implemented here)
   - Pros: simple compatibility with GCP services that leverage peering internally, better control on routes, avoids peering groups shared quotas and limits
   - Cons: additional cost, marginal increase in latency, requires multiple tunnels for full bandwidth
-- [VPC Peering](https://cloud.google.com/vpc/docs/vpc-peering) (implemented by [2-networking-peering](../2-networking-a-peering/))
+- [VPC Peering](https://cloud.google.com/vpc/docs/vpc-peering) (implemented by [2-networking-a-peering](../2-networking-a-peering/))
   - Pros: no additional costs, full bandwidth with no configurations, no extra latency
   - Cons: no transitivity (e.g. to GKE masters, Cloud SQL, etc.), no selective exchange of routes, several quotas and limits shared between VPCs in a peering group
-- [Multi-NIC appliances](https://cloud.google.com/architecture/best-practices-vpc-design#multi-nic) (implemented by [2-networking-nva](../2-networking-c-nva/))
+- [Multi-NIC appliances](https://cloud.google.com/architecture/best-practices-vpc-design#multi-nic) (implemented by [2-networking-c-nva](../2-networking-c-nva/) and [2-networking-e-nva-bgp](../2-networking-e-nva-bgp/))
   - Pros: additional security features (e.g. IPS), potentially better integration with on-prem systems by using the same vendor
   - Cons: complex HA/failover setup, limited by VM bandwidth and scale, additional costs for VMs and licenses, out of band management of a critical cloud component
 

fast/stages/2-networking-c-nva/README.md

@@ -110,7 +110,7 @@ This is an options summary:
 - [VPC Peering](https://cloud.google.com/vpc/docs/vpc-peering) (used here to connect the trusted landing VPC with the spokes, also used by [02-networking-vpn](../2-networking-b-vpn/))
   - Pros: no additional costs, full bandwidth with no configurations, no extra latency
   - Cons: no transitivity (e.g. to GKE masters, Cloud SQL, etc.), no selective exchange of routes, several quotas and limits shared between VPCs in a peering group
-- [Multi-NIC appliances](https://cloud.google.com/architecture/best-practices-vpc-design#multi-nic) (used here to connect the trusted landing and untrusted VPCs)
+- [Multi-NIC appliances](https://cloud.google.com/architecture/best-practices-vpc-design#multi-nic) (used here to connect the trusted landing and untrusted VPCs) and multi-NIC appliances with NCC/BGP support implemented [here](../2-networking-e-nva-bgp/)
   - Pros: provides additional security features (e.g. IPS), potentially better integration with on-prem systems by using the same vendor
   - Cons: complex HA/failover setup, limited by VM bandwidth and scale, additional costs for VMs and licenses, out of band management of a critical cloud component
 - [HA VPN](https://cloud.google.com/network-connectivity/docs/vpn/concepts/topologies)

fast/stages/2-networking-d-separate-envs/README.md

@@ -6,7 +6,7 @@ While no communication between environment is implemented on this design, that c
 
 - [VPC Peering](https://cloud.google.com/vpc/docs/vpc-peering) - which is not recommended as it would effectively create a full line of sight between workloads belonging to different environments
 - [VPN HA](https://cloud.google.com/network-connectivity/docs/vpn/concepts/topologies) tunnels between environments, exchanging a subset of well-defined routes.
-- [Multi-NIC appliances](https://cloud.google.com/architecture/best-practices-vpc-design#multi-nic) connecting the different environments, allowing the use of NVAs to enforce networking policies.
+- [Multi-NIC appliances](https://cloud.google.com/architecture/best-practices-vpc-design#multi-nic) implemented in [2-networking-c-nva](../2-networking-c-nva) and [2-networking-e-nva-bgp](../2-networking-e-nva-bgp) connecting the different environments, allowing the use of NVAs to enforce networking policies.
 
 The following diagram illustrates the high-level design, and should be used as a reference for the following sections. The final number of subnets, and their IP addressing design will of course depend on customer-specific requirements, and can be easily changed via variables or external data files without having to edit the actual code.