hubandspoke_complex.azcli

# Create a complex hub and spoke environment
# The control variables shape the environment

# Control
no_of_spokes=2
shared_services_spoke=yes
no_of_subnets_per_spoke=4
no_of_vms_per_subnet=2
create_azfw=no
intra_spoke_traffic_to_azfw=no
per_vm_nsg=no
per_subnet_nsg=no
use_asgs=yes
use_ip_groups=yes

# Variables
rg=complexhns
location=westcentralus
hub_vnet_name=hubvnet
ss_vnet_name=sharedservices
hub_vnet_prefix=192.168.0.0/24
azfw_subnet_name=AzureFirewallSubnet
azfw_subnet_prefix=192.168.0.0/26
azfw_name=hnsfw
azfw_policy_name=hnsfwpolicy
spoke_vnet_prefix_beginning='192.168.'
spoke_vnet_prefix_end='.0/24'
spoke_subnet_prefix_ends=('.0/28' '.16/28' '.32/28' '.48/28' '.64/28' '.80/28' '.96/28' '.112/28' '.128/28' '.144/28' '.160/28' '.176/28' '.192/28' '.208/28' '.224/28' '.240/28')
vm_size=Standard_B1s
odd_even_asgs=no

# Get the subnet prefix for a given spoke and subnet
function get_subnet_prefix() {
    spoke_id=$1
    subnet_id=$2
    shell_short=$(echo $SHELL | rev | cut -d/ -f 1 | rev)
    if [[ "$shell_short" == "zsh" ]]; then
        spoke_subnet_prefix="${spoke_vnet_prefix_beginning}${spoke_id}${spoke_subnet_prefix_ends[$subnet_id]}"
    elif [[ "$shell_short" == "bash" ]]; then
        spoke_subnet_prefix="${spoke_vnet_prefix_beginning}${spoke_id}${spoke_subnet_prefix_ends[$((subnet_id-1))]}"
    else
        echo "Unknown shell $shell_short"
        exit 1
    fi
    echo $spoke_subnet_prefix
}

# Create environment
echo "Creating RG $rg and hub VNet with prefix $hub_vnet_prefix..."
az group create -n $rg -l $location -o none --only-show-errors
# If there is no fw, we dont need a hub VNet
if [[ "$create_azfw" == "yes" ]]; then
    az network vnet create -g $rg -n $hub_vnet_name --address-prefix $hub_vnet_prefix -l $location -o none --only-show-errors
fi
# Create spokes
for spoke_id in {1..$no_of_spokes}; do
    spoke_vnet_name="spoke${spoke_id}"
    spoke_vnet_prefix="${spoke_vnet_prefix_beginning}${spoke_id}${spoke_vnet_prefix_end}"
    echo "Creating spoke VNet ${spoke_vnet_name} with prefix ${spoke_vnet_prefix}..."
    az network vnet create -g $rg -n $spoke_vnet_name --address-prefix $spoke_vnet_prefix -l $location -o none --only-show-errors
    # Create subnets
    for subnet_id in {1..$no_of_subnets_per_spoke}; do
        spoke_subnet_name="subnet${subnet_id}"
        spoke_subnet_prefix=$(get_subnet_prefix $spoke_id $subnet_id)
        echo "Creating spoke subnet ${spoke_subnet_name} in VNet ${spoke_vnet_name} with prefix ${spoke_subnet_prefix}..."
        az network vnet subnet create -n $spoke_subnet_name -g $rg --vnet-name $spoke_vnet_name --address-prefix $spoke_subnet_prefix -o none --only-show-errors
    done
done
# Shared services spoke
if [[ "$shared_services_spoke" == "yes" ]]; then
    spoke_id=$((no_of_spokes+1))
    spoke_vnet_name="$ss_vnet_name"
    spoke_vnet_prefix="${spoke_vnet_prefix_beginning}${spoke_id}${spoke_vnet_prefix_end}"
    echo "Creating shared services VNet ${spoke_vnet_name} with prefix ${spoke_vnet_prefix}..."
    az network vnet create -g $rg -n $spoke_vnet_name --address-prefix $spoke_vnet_prefix -l $location -o none --only-show-errors
    nsg_name="SharedServicesNSG"
    echo "Creating NSG ${nsg_name}..."
    az network nsg create -n $nsg_name -g $rg -o none --only-show-errors
    # Create subnets assigned to the NSG
    for subnet_id in {1..$no_of_subnets_per_spoke}; do
        spoke_subnet_name="subnet${subnet_id}"
        spoke_subnet_prefix=$(get_subnet_prefix $spoke_id $subnet_id)
        echo "Creating shared services subnet ${spoke_subnet_name} in VNet ${spoke_vnet_name} with prefix ${spoke_subnet_prefix}..."
        az network vnet subnet create -n $spoke_subnet_name -g $rg --vnet-name $spoke_vnet_name --address-prefix $spoke_subnet_prefix --nsg $nsg_name -o none --only-show-errors
    done
    # Add rules to the NSG to explicitly allow traffic from the spokes (and ideally to drop everything else)
    for spoke_id in {1..$no_of_spokes}; do
        spoke_vnet_name="spoke${spoke_id}"
        spoke_vnet_prefix="${spoke_vnet_prefix_beginning}${spoke_id}${spoke_vnet_prefix_end}"
        echo "Adding rule to NSG $nsg_name to allow traffic from spoke VNet ${spoke_vnet_name} with prefix ${spoke_vnet_prefix}..."
        az network nsg rule create -g $rg --nsg-name $nsg_name -n "AllowTrafficFromSpoke${spoke_id}" --priority "20${spoke_id}" --source-address-prefixes $spoke_vnet_prefix --source-port-ranges '*' --destination-address-prefixes '*' --destination-port-ranges '*' --access Allow --protocol '*' --description "Allow traffic from spoke VNet ${spoke_vnet_name} with prefix ${spoke_vnet_prefix}" -o none --only-show-errors
    done
    echo "Adding explicit deny rule to NSG $nsg_name..."
    az network nsg rule create -g $rg --nsg-name $nsg_name -n "DenyAll" --priority "999" --source-address-prefixes '*' --source-port-ranges '*' --destination-address-prefixes '*' --destination-port-ranges '*' --access Allow --protocol '*' --description "Explicit deny" -o none --only-show-errors
fi

# Azure Firewall (optional)
if [[ "$create_azfw" == "yes" ]]; then
    azfw_pip_name="${azfw_name}-pip"
    az network public-ip create -g $rg -n $azfw_pip_name --sku standard --allocation-method static -l $location -o none --only-show-errors
    azfw_ip=$(az network public-ip show -g $rg -n $azfw_pip_name --query ipAddress -o tsv)
    # Create policy
    echo "Creating Azure Firewall policy..."
    az network firewall policy create -n $azfw_policy_name -g $rg -o none
    az network firewall policy rule-collection-group create -n ruleset01 --policy-name $azfw_policy_name -g $rg --priority 1000 -o none --only-show-errors
    # Create IP group RFC1918 if required
    if [[ "$use_ip_groups" == "yes" ]]; then
        echo "Creating IP group for RFC1918 prefixes..."
        az network ip-group create -n 'rfc1918' -g $rg --location $location --ip-addresses '10.0.0.0/8' '172.16.0.0/12' '192.168.0.0/16' -o none --only-show-errors
    fi
    # Allow SSH and HTTP
    echo "Creating rule to allow SSH and HTTP..."
    if [[ "$use_ip_groups" == "yes" ]]; then
        az network firewall policy rule-collection-group collection add-filter-collection --policy-name $azfw_policy_name --rule-collection-group-name ruleset01 -g $rg \
            --name mgmt --collection-priority 101 --action Allow --rule-name allowSSHnHTTP --rule-type NetworkRule --description "TCP 22" \
            --destination-ip-groups 'rfc1918' --source-ip-groups 'rfc1918' --ip-protocols TCP --destination-ports 22 80 -o none --only-show-errors
    else
        az network firewall policy rule-collection-group collection add-filter-collection --policy-name $azfw_policy_name --rule-collection-group-name ruleset01 -g $rg \
            --name mgmt --collection-priority 101 --action Allow --rule-name allowSSHnHTTP --rule-type NetworkRule --description "TCP 22" \
            --destination-addresses 10.0.0.0/8 172.16.0.0/12 192.168.0.0/16 --source-addresses 10.0.0.0/8 172.16.0.0/12 192.168.0.0/16 --ip-protocols TCP --destination-ports 22 80 -o none --only-show-errors
    fi
    # Allow ICMP
    echo "Creating rule to allow ICMP..."
    if [[ "$use_ip_groups" == "yes" ]]; then
        az network firewall policy rule-collection-group collection add-filter-collection --policy-name $azfw_policy_name --rule-collection-group-name ruleset01 -g $rg \
            --name icmp --collection-priority 102 --action Allow --rule-name allowICMP --rule-type NetworkRule --description "ICMP traffic" \
            --destination-ip-groups 'rfc1918' --source-ip-groups 'rfc1918' --ip-protocols ICMP --destination-ports "1-65535" -o none --only-show-errors
    else
        az network firewall policy rule-collection-group collection add-filter-collection --policy-name $azfw_policy_name --rule-collection-group-name ruleset01 -g $rg \
            --name icmp --collection-priority 102 --action Allow --rule-name allowICMP --rule-type NetworkRule --description "ICMP traffic" \
            --destination-addresses 10.0.0.0/8 172.16.0.0/12 192.168.0.0/16 --source-addresses 10.0.0.0/8 172.16.0.0/12 192.168.0.0/16 --ip-protocols ICMP --destination-ports "1-65535" -o none --only-show-errors
    fi
    # Allow NTP
    echo "Creating rule to allow NTP..."
    if [[ "$use_ip_groups" == "yes" ]]; then
        az network firewall policy rule-collection-group collection add-filter-collection --policy-name $azfw_policy_name --rule-collection-group-name ruleset01 -g $rg \
            --name ntp --collection-priority 103 --action Allow --rule-name allowNTP --rule-type NetworkRule --description "Egress NTP traffic" \
            --destination-addresses '*' --source-ip-groups 'rfc1918' --ip-protocols UDP --destination-ports "123" -o none --only-show-errors
    else
        az network firewall policy rule-collection-group collection add-filter-collection --policy-name $azfw_policy_name --rule-collection-group-name ruleset01 -g $rg \
            --name ntp --collection-priority 103 --action Allow --rule-name allowNTP --rule-type NetworkRule --description "Egress NTP traffic" \
            --destination-addresses '*' --source-addresses "10.0.0.0/8" "172.16.0.0/12" "192.168.0.0/16" --ip-protocols UDP --destination-ports "123" -o none --only-show-errors
    fi
    # Create Az FW
    echo "Creating Azure Firewall..."
    az network firewall create -n $azfw_name -g $rg --policy $azfw_policy_name -l $location -o none --only-show-errors
    # Network config
    echo "Configuring Azure Firewall in hub VNet..."
    az network vnet subnet create -n $azfw_subnet_name -g $rg --vnet-name $hub_vnet_name --address-prefix $azfw_subnet_prefix -o none --only-show-errors
    az network firewall ip-config create -f $azfw_name -n azfw-ipconfig -g $rg --public-ip-address $azfw_pip_name --vnet-name $hub_vnet_name -o none --only-show-errors
    az network firewall update -n $azfw_name -g $rg -o none --only-show-errors
    azfw_private_ip=$(az network firewall show -n $azfw_name -g $rg -o tsv --query 'ipConfigurations[0].privateIpAddress')
    echo "Azure Firewall created with private IP $azfw_private_ip"
fi

# Azure Firewall - create VNet-to-VNet rules (WIP)
if [[ "$create_azfw" == "yes" ]]; then
    if [[ "$use_ip_groups" == "yes" ]]; then
        echo "Creating IP group for spoke VNet $spoke_vnet_name..."
        az network ip-group create -n $spoke_vnet_name -g $rg --location $location --ip-addresses $spoke_vnet_prefix -o none --only-show-errors
    fi
    for spoke_id in {1..$no_of_spokes}; do
        spoke_vnet_name="spoke${spoke_id}"
        spoke_vnet_prefix="${spoke_vnet_prefix_beginning}${spoke_id}${spoke_vnet_prefix_end}"
        rcg_prio="100${spoke_id}"
        echo "Creating RCG $spoke_vnet_name..."
        az network firewall policy rule-collection-group create -n $spoke_vnet_name --policy-name $azfw_policy_name -g $rg --priority $rcg_prio -o none --only-show-errors
        for subnet_id in {1..$no_of_subnets_per_spoke}; do
            spoke_subnet_name="subnet${subnet_id}"
            spoke_subnet_prefix=$(get_subnet_prefix $spoke_id $subnet_id)
            collection_priority="10${spoke_id}${subnet_id}"
            if [[ "$use_ip_groups" == "yes" ]]; then
                ip_group_name="${spoke_vnet_name}-${spoke_subnet_name}"
                echo "Creating IP group ${ip_group_name}..."
                az network ip-group create -n $ip_group_name -g $rg --location $location --ip-addresses $spoke_subnet_prefix -o none --only-show-errors
                echo "Creating rule to allow SSH and HTTP with priority $collection_priority from subnet $spoke_subnet_name in VNet $spoke_vnet_name using IP groups..."
                az network firewall policy rule-collection-group collection add-filter-collection --policy-name "$azfw_policy_name" --rule-collection-group-name "${spoke_vnet_name}" -g $rg \
                    --name $spoke_subnet_name --collection-priority $collection_priority --action Allow --rule-name allowSSHnHTTP --rule-type NetworkRule --description 'SSH and HTTP' \
                    --destination-ip-groups 'rfc1918' --source-ip-groups $ip_group_name --ip-protocols TCP --destination-ports 22 80 -o none --only-show-errors
            else
                echo "Creating rule to allow SSH and HTTP with priority $collection_priority from subnet $spoke_subnet_name in VNet $spoke_vnet_name using hard-coded IP addresses..."
                az network firewall policy rule-collection-group collection add-filter-collection --policy-name $azfw_policy_name --rule-collection-group-name "${spoke_vnet_name}" -g $rg \
                    --name $spoke_subnet_name --collection-priority $collection_priority --action Allow --rule-name allowSSHnHTTP --rule-type NetworkRule --description 'SSH and HTTP' \
                    --destination-addresses 10.0.0.0/8 172.16.0.0/12 192.168.0.0/16 --source-addresses $spoke_subnet_prefix --ip-protocols TCP --destination-ports 22 80 -o none --only-show-errors
            fi
        done
    done
fi

# VNet Peerings
# If there is a firewall, we do a hub&spoke topology. Otherwise a full mesh
if [[ "$create_azfw" == "yes" ]]; then
    for spoke_id in {1..$no_of_spokes}; do
        spoke_vnet_name="spoke${spoke_id}"
        echo "Peering VNet $spoke_vnet_name with $hub_vnet_name..."
        az network vnet peering create -n "hubto${spoke_vnet_name}" -g $rg --vnet-name $hub_vnet_name --remote-vnet $spoke_vnet_name --allow-vnet-access --allow-forwarded-traffic -o none --only-show-errors
        az network vnet peering create -n "${spoke_vnet_name}tohub" -g $rg --vnet-name $spoke_vnet_name --remote-vnet $hub_vnet_name --allow-vnet-access --allow-forwarded-traffic -o none --only-show-errors
    done
else
    for spoke1_id in {1..$no_of_spokes}; do
        for spoke2_id in {1..$no_of_spokes}; do
            if [[ "$spoke1_id" -lt "$spoke2_id" ]]; then
                spoke1_vnet_name="spoke${spoke1_id}"
                spoke2_vnet_name="spoke${spoke2_id}"
                echo "Peering VNet $spoke1_vnet_name with $spoke2_vnet_name..."
                az network vnet peering create -n "${spoke1_vnet_name}to${spoke2_vnet_name}" -g $rg --vnet-name ${spoke1_vnet_name} --remote-vnet ${spoke2_vnet_name} --allow-vnet-access --allow-forwarded-traffic -o none --only-show-errors
                az network vnet peering create -n "${spoke2_vnet_name}to${spoke1_vnet_name}" -g $rg --vnet-name ${spoke2_vnet_name} --remote-vnet ${spoke1_vnet_name} --allow-vnet-access --allow-forwarded-traffic -o none --only-show-errors
            fi
        done
    done
fi
# If shared services, peer every spoke to the shared services VNet
if [[ "$shared_services_spoke" == "yes" ]]; then
    for spoke_id in {1..$no_of_spokes}; do
        spoke_vnet_name="spoke${spoke_id}"
        echo "Peering VNet $spoke_vnet_name with $ss_vnet_name..."
        az network vnet peering create -n "Sharedto${spoke_vnet_name}" -g $rg --vnet-name $ss_vnet_name --remote-vnet $spoke_vnet_name --allow-vnet-access --allow-forwarded-traffic -o none --only-show-errors
        az network vnet peering create -n "${spoke_vnet_name}toShared" -g $rg --vnet-name $spoke_vnet_name --remote-vnet $ss_vnet_name --allow-vnet-access --allow-forwarded-traffic -o none --only-show-errors
    done
fi

# VMs
for spoke_id in {1..$no_of_spokes}; do
    spoke_vnet_name="spoke${spoke_id}"
    if [[ "$use_asgs" == "yes" ]]; then
        echo "Creating ASGs for $spoke_vnet_name..."
        # Do we need an ASG for all VMs in the VNet?? Maybe for the rule to Shared Services? (using the VNet prefix now)
        az network asg create -g $rg -n $spoke_vnet_name --location $location -o none --only-show-errors
        if [[ "$odd_even_asgs" == "yes" ]]; then
            az network asg create -g $rg -n "${spoke_vnet_name}-EvenSubnet" --location $location -o none --only-show-errors
            az network asg create -g $rg -n "${spoke_vnet_name}-OddSubnet" --location $location -o none --only-show-errors
        fi
    fi
    for subnet_id in {1..$no_of_subnets_per_spoke}; do
        spoke_subnet_name="subnet${subnet_id}"
        # Create VMs, optionally with NSGs
        for vm_id in {1..$no_of_vms_per_subnet}; do
            spoke_vm_name="spoke${spoke_id}-${subnet_id}-vm-${vm_id}"
            if [[ "$per_vm_nsg" == "yes" ]]; then
                echo "Creating VM ${spoke_vm_name} in subnet ${spoke_subnet_name} in VNet ${spoke_vnet_name} with a dedicated NSG..."
                az vm create -n $spoke_vm_name -g $rg -l $location --image ubuntuLTS --generate-ssh-keys -o none --public-ip-sku Standard --nsg "${spoke_vm_name}-nsg" \
                    --public-ip-address '' --vnet-name $spoke_vnet_name --size $vm_size --subnet $spoke_subnet_name -o none --only-show-errors --no-wait
            else
                echo "Creating VM ${spoke_vm_name} in subnet ${spoke_subnet_name} in VNet ${spoke_vnet_name} with no NSG..."
                az vm create -n $spoke_vm_name -g $rg -l $location --image ubuntuLTS --generate-ssh-keys -o none --public-ip-sku Standard --nsg '' \
                    --public-ip-address '' --vnet-name $spoke_vnet_name --size $vm_size --subnet $spoke_subnet_name -o none --only-show-errors --no-wait
            fi
        done
        # Optionally use ASGs
        if [[ "$use_asgs" == "yes" ]]; then
            echo "Creating ASG "${spoke_vnet_name}-${spoke_subnet_name}"..."
            az network asg create -g $rg -n "${spoke_vnet_name}-${spoke_subnet_name}" --location $location -o none --only-show-errors
            echo "Updating VM ${spoke_vm_name} in subnet ${spoke_subnet_name} in VNet ${spoke_vnet_name} with ASGs..."
            nic_id=$(az vm show -n $spoke_vm_name -g $rg --query 'networkProfile.networkInterfaces[0].id' -o tsv)
            nic_name=$(echo $nic_id | cut -d'/' -f9)
            ip_config_name=$(az network nic show --ids $nic_id --query 'ipConfigurations[0].name' -o tsv)
            if [[ "$odd_even_asgs" == "yes" ]]; then
                _value=$(expr $subnet_id % 2)
                (( $_value == 0 )) && subnet_even_asg="${spoke_vnet_name}-EvenSubnet" || subnet_even_asg="${spoke_vnet_name}-OddSubnet"
                az network nic ip-config update -g $rg --nic-name $nic_name -n $ip_config_name --asgs $spoke_vnet_name "${spoke_vnet_name}-${spoke_subnet_name}" $subnet_even_asg -o none --only-show-errors
            else
                az network nic ip-config update -g $rg --nic-name $nic_name -n $ip_config_name --asgs $spoke_vnet_name "${spoke_vnet_name}-${spoke_subnet_name}" -o none --only-show-errors
            fi
        fi
    done
done

# Shared services VMs
if [[ "$shared_services_spoke" == "yes" ]]; then
    ss_spoke_id=$((no_of_spokes+1))
    ss_spoke_vnet_prefix="${spoke_vnet_prefix_beginning}${ss_spoke_id}${spoke_vnet_prefix_end}"
    for subnet_id in {1..$no_of_subnets_per_spoke}; do
        spoke_subnet_name="subnet${subnet_id}"
        # Create VMs, optionally with NSGs
        for vm_id in {1..$no_of_vms_per_subnet}; do
            spoke_vm_name="SharedServices-${subnet_id}-vm-${vm_id}"
            echo "Creating VM ${spoke_vm_name} in subnet ${spoke_subnet_name} in VNet ${ss_vnet_name} with no NSG..."
            az vm create -n $spoke_vm_name -g $rg -l $location --image ubuntuLTS --generate-ssh-keys -o none --public-ip-sku Standard --nsg '' \
                --public-ip-address '' --vnet-name $ss_vnet_name --size $vm_size --subnet $spoke_subnet_name -o none --only-show-errors --no-wait
        done
    done
fi

# Shutdown created VMs for cost savings
for spoke_id in {1..$no_of_spokes}; do
    for subnet_id in {1..$no_of_subnets_per_spoke}; do
        for vm_id in {1..$no_of_vms_per_subnet}; do
            spoke_vm_name="spoke${spoke_id}-${subnet_id}-vm-${vm_id}"
            echo "Shutting down VM ${spoke_vm_name}..."
            az vm deallocate -n $spoke_vm_name -g $rg --no-wait -o none --only-show-errors
        done
    done
done
if [[ "$shared_services_spoke" == "yes" ]]; then
    for subnet_id in {1..$no_of_subnets_per_spoke}; do
        for vm_id in {1..$no_of_vms_per_subnet}; do
            spoke_vm_name="SharedServices-${subnet_id}-vm-${vm_id}"
            echo "Shutting down VM ${spoke_vm_name}..."
            az vm deallocate -n $spoke_vm_name -g $rg --no-wait -o none --only-show-errors
        done
    done
fi

# Create route tables (a single route table is required if intra spoke traffic is not sent to AZFW, otherwise a route table per spoke is required)
if [[ "$create_azfw" == "yes" ]]; then
    if [[ "$intra_spoke_traffic_to_azfw" == "no" ]]; then
        echo "Creating single route table for all spokes..."
        route_table_name="spoke-rt"
        az network route-table create -n $route_table_name -g $rg -o none -l $location --only-show-errors
        az network route-table route create -n "default" -g $rg --route-table-name $route_table_name --address-prefix "0.0.0.0/0" \
            --next-hop-type VirtualAppliance --next-hop-ip-address $azfw_private_ip -o none --only-show-errors
    fi
    for spoke_id in {1..$no_of_spokes}; do
        spoke_vnet_name="spoke${spoke_id}"
        spoke_vnet_prefix="${spoke_vnet_prefix_beginning}${spoke_id}${spoke_vnet_prefix_end}"
        for subnet_id in {1..$no_of_subnets_per_spoke}; do
            spoke_subnet_name="subnet${subnet_id}"
            spoke_subnet_prefix=$(get_subnet_prefix $spoke_id $subnet_id)
            # If intra-spoke traffic is sent to AzFW, create a route table for each spoke subnet
            if [[ "$intra_spoke_traffic_to_azfw" == "yes" ]]; then
                route_table_name="${spoke_vnet_name}-${spoke_subnet_name}-rt"
                echo "Creating route table $route_table_name for subnet $spoke_subnet_name in VNet $spoke_vnet_name..."
                az network route-table create -n $route_table_name -g $rg -o none -l $location --only-show-errors
                az network route-table route create -n "default" -g $rg --route-table-name $route_table_name --address-prefix "0.0.0.0/0" \
                    --next-hop-type VirtualAppliance --next-hop-ip-address $azfw_private_ip -o none --only-show-errors
                az network route-table route create -n "localvnet" -g $rg --route-table-name $route_table_name --address-prefix "$spoke_vnet_prefix" \
                    --next-hop-type VirtualAppliance --next-hop-ip-address $azfw_private_ip -o none --only-show-errors
                az network route-table route create -n "localsubnet" -g $rg --route-table-name $route_table_name --address-prefix "$spoke_subnet_prefix" \
                    --next-hop-type VnetLocal -o none --only-show-errors
            fi
            # Associate route table with subnet
            echo "Associating route table $route_table_name with subnet $spoke_subnet_name..."
            az network vnet subnet update -n $spoke_subnet_name -g $rg --vnet-name $spoke_vnet_name --route-table $route_table_name -o none --only-show-errors
        done
    done
fi

# Create subnet/VNet NSGs
if [[ "$per_vm_nsg" == "no" ]]; then
    # Per-subnet NSGs
    if [[ "$per_subnet_nsg" == "yes" ]]; then
        for spoke_id in {1..$no_of_spokes}; do
            spoke_vnet_name="spoke${spoke_id}"
            for subnet_id in {1..$no_of_subnets_per_spoke}; do
                spoke_subnet_name="subnet${subnet_id}"
                nsg_name="${spoke_vnet_name}-${spoke_subnet_name}-nsg"
                echo "Creating NSG ${nsg_name}..."
                az network nsg create -n $nsg_name -g $rg -o none --only-show-errors
                # Rules for intra-VNet traffic, optionally using ASGs
                if [[ $use_asgs == "yes" ]]; then
                    _value=$(expr $subnet_id % 2)
                    (( $_value == 0 )) && subnet_even_asg="${spoke_vnet_name}-EvenSubnet" || subnet_even_asg="${spoke_vnet_name}-OddSubnet"
                    echo "Creating NSG rule for intra-VNet traffic using ASGs..."
                    az network nsg rule create -g $rg --nsg-name $nsg_name -n "OddEvenSubnet" --priority 100 --source-asgs "${spoke_vnet_name}-${spoke_subnet_name}" \
                        --source-port-ranges '*' --destination-asgs "${subnet_even_asg}" --destination-port-ranges '*' --access Allow \
                        --protocol '*' --description "Allow traffic to ASG $subnet_even_asg" -o none --only-show-errors
                else
                    echo "Creating NSG rule for intra-VNet traffic..."
                    spoke_subnet_prefix=$(get_subnet_prefix $spoke_id $subnet_id)
                    dst_subnet_id=$((subnet_id+1))
                    if [[ $dst_subnet_id -gt $no_of_subnets_per_spoke ]]; then
                        dst_subnet_id=1
                    fi
                    dst_spoke_subnet_prefix=$(get_subnet_prefix $spoke_id $dst_subnet_id)
                    az network nsg rule create -g $rg --nsg-name $nsg_name -n "intra-vnet" --priority 100 --source-address-prefixes "$spoke_subnet_prefix" \
                        --source-port-ranges '*' --destination-address-prefixes "$dst_spoke_subnet_prefix" --destination-port-ranges '*' --access Allow \
                        --protocol '*' --description "Allow intra-VNet traffic" -o none --only-show-errors
                fi
                # Associate NSG with subnet
                echo "Associating NSG $nsg_name with subnet $spoke_subnet_name..."
                az network vnet subnet update -n $spoke_subnet_name -g $rg --vnet-name $spoke_vnet_name --network-security-group $nsg_name -o none --only-show-errors
            done
        done
    # Per-VNet NSGs
    else
        for spoke_id in {1..$no_of_spokes}; do
            spoke_vnet_name="spoke${spoke_id}"
            spoke_vnet_prefix="${spoke_vnet_prefix_beginning}${spoke_id}${spoke_vnet_prefix_end}"
            nsg_name="${spoke_vnet_name}-nsg"
            echo "Creating NSG ${nsg_name}..."
            az network nsg create -n $nsg_name -g $rg -o none --only-show-errors
            # Create rules for subnet-to-subnet traffic
            for subnet_id in {1..$no_of_subnets_per_spoke}; do
                if [[ "$subnet_id" -lt "$no_of_subnets_per_spoke" ]]; then
                    src_subnet_id=$subnet_id
                    src_spoke_subnet_name="subnet${src_subnet_id}"
                    dst_subnet_id=$((subnet_id+1))
                    dst_spoke_subnet_name="subnet${dst_subnet_id}"
                    if [[ $use_asgs == "yes" ]]; then
                        src_asg_name="${spoke_vnet_name}-${src_spoke_subnet_name}"
                        dst_asg_name="${spoke_vnet_name}-${dst_spoke_subnet_name}"
                        az network nsg rule create -g $rg --nsg-name $nsg_name -n "Subnet${src_subnet_id}to${dst_subnet_id}" --priority 20${src_subnet_id} --source-asgs "${src_asg_name}" \
                            --source-port-ranges '*' --destination-asgs "${dst_asg_name}" --destination-port-ranges '*' --access Allow \
                            --protocol '*' --description "Allow traffic from ASG $src_asg_name to ASG $dst_asg_name" -o none --only-show-errors
                    else
                        src_spoke_subnet_prefix=$(get_subnet_prefix $spoke_id $src_subnet_id)
                        dst_spoke_subnet_prefix=$(get_subnet_prefix $spoke_id $dst_subnet_id)
                        az network nsg rule create -g $rg --nsg-name $nsg_name -n "intra-vnet" --priority 20${src_subnet_id} --source-address-prefixes "$src_spoke_subnet_prefix" \
                            --source-port-ranges '*' --destination-address-prefixes "$dst_spoke_subnet_prefix" --destination-port-ranges '*' --access Allow \
                            --protocol '*' --description "Allow intra-VNet traffic from subnet ${src_subnet_id} to subnet ${dst_subnet_id}" -o none --only-show-errors
                    fi
                fi
            done
            # Create rule for traffic to shared services
            if [[ "$shared_services_spoke" == "yes" ]]; then
                ss_spoke_id=$((no_of_spokes+1))
                ss_spoke_vnet_prefix="${spoke_vnet_prefix_beginning}${ss_spoke_id}${spoke_vnet_prefix_end}"
                if [[ "$use_asgs" == "yes" ]]; then
                    az network nsg rule create -g $rg --nsg-name $nsg_name -n "SharedServices" --priority 400 --source-asgs "$spoke_vnet_name" \
                        --source-port-ranges '*' --destination-address-prefixes "$ss_spoke_vnet_prefix" --destination-port-ranges '*' --access Allow \
                        --protocol '*' --description "Allow traffic to shared services VNet" -o none --only-show-errors
                else
                    az network nsg rule create -g $rg --nsg-name $nsg_name -n "SharedServices" --priority 400 --source-address-prefixes "$spoke_vnet_prefix" \
                        --source-port-ranges '*' --destination-address-prefixes "$ss_spoke_vnet_prefix" --destination-port-ranges '*' --access Allow \
                        --protocol '*' --description "Allow traffic to shared services VNet" -o none --only-show-errors
                fi
            fi
            # Assign NSG to subnet
            for subnet_id in {1..$no_of_subnets_per_spoke}; do
                spoke_subnet_name="subnet${subnet_id}"
                echo "Associating NSG $nsg_name with subnet $spoke_subnet_name..."
                az network vnet subnet update -n $spoke_subnet_name -g $rg --vnet-name $spoke_vnet_name --network-security-group $nsg_name -o none --only-show-errors
            done
        done
    fi
fi

###############
# Diagnostics #
###############

# Print all route tables
function show_routes() {
        rt_list=$(az network route-table list -g $rg --query '[].name' -o tsv)
        echo $rt_list | while IFS= read -r rt; do
            echo "Route table $rt:"
            az network route-table route list -g $rg --route-table-name $rt -o table
        done
}

# Print all NSGs
function show_nsgs() {
    nsg_list=$(az network nsg list -g $rg --query '[].name' -o tsv)
    echo $nsg_list | while IFS= read -r nsg; do
        echo "NSG $nsg:"
        az network nsg rule list -g $rg --nsg-name $nsg -o table
    done
}


# Cleanup
# az group delete -y -n $rg --no-wait