> ## Documentation Index > Fetch the complete documentation index at: https://docs.aviatrix.com/llms.txt > Use this file to discover all available pages before exploring further. # Prerequisites for Edge Transit Gateway Deployment on the Aviatrix Edge Platform > The following are the prerequisites to deploy an Aviatrix Edge Transit Gateway on the Aviatrix Edge Platform. The following are the prerequisites to deploy an Aviatrix Edge Transit Gateway on the Aviatrix Edge Platform. ## 1. Procure and Onboard the Edge Device Before you can deploy an Aviatrix Edge Transit Gateway, you must procure and onboard your edge device onto the Aviatrix Edge Platform. For more information, see Installing Edge OS and Onboarding Dell Hardware . ## 2. Obtain Edge Gateway Interface IP Addresses The Edge Transit Gateway on the Aviatrix Edge Platform supports one Management and up to 4 WAN interfaces. *For each WAN interface that you want to configure*, you will need to provide the following information during Edge Gateway creation for your primary and secondary HA Edge Gateways. | **WAN Interface** | **Description** | | ------------------------- | ----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- | | Interface Primary CIDR | The CIDR for the WAN interface. DHCP for dynamic IP address assignment is not supported. Interface CIDR must be in the format `interface_ip/netmask` (for example, 192.18.20.1/24). Interface CIDR cannot be link-local CIDR. If you need to create a BGP underlay connection to cloud service provider (CSP) with a link-local IP address, you must enter the link-local IP address in the Link-local Underlay CIDR setting of the WAN interface. | | Interface Secondary CIDRs | The secondary CIDRs for the WAN interface. Interface CIDR must be in the format `interface_ip/netmask` (for example, 192.18.20.1/24). The secondary CIDRs are used for High Performance Encryption (HPE) attachment peering connections over a private network between the Edge Transit Gateway to another Edge Transit Gateway or Edge Spoke Gateway. The secondary IP addresses (based on the secondary CIDRs) are automatically assigned to create the peering connections. You can define /32 CIDR for specific secondary IP address. Secondary CIDR cannot be link-local CIDR. | | Default Gateway IP | The Default Gateway IP address for the WAN interface. For CSP underlay, this is the remote side IP address of the BGP session on CSP VNG or VGW. If Link-Local Underlay CIDR is configured, the Default Gateway IP should be in the same subnet as the Link-Local Underlay CIDR, otherwise, it should be in the same subnet as the WAN Interface CIDR. | | Public IP | The public IP for the WAN interface. The public IP of the WAN interface is used for peering connections over the public network. | If the Edge Gateway will be used in environments where connections to Cloud Service Providers (CSPs) are available, then BGP configurations can be set up on the Edge gateway to peer with cloud routers such as VGW, VNG and Google Cloud router. For BGP underlay connections to CSP, you will need to provide the following information. | **BGP Configuration** | **Description** | | ----------------------------------- | ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- | | Link-Local Underlay CIDR (GCP only) | The Link-Local Underlay CIDR is used for BGP underlay connections to cloud service provider (CSP). If you need to create a BGP underlay connection to CSP with a link-local IP address, you must provide the Link-Local Underlay CIDR for the WAN interface in the format of `link_local_underlay_ip`/`netmask` (for example 169.254.100.3/24). This is required for GCP. If terminating GCP Interconnect and using BGP underlay on Edge, provide the WAN Default Gateway of the peer IP address. If Link-Local Underlay CIDR is configured, the Default Gateway IP should be in the same subnet as the Link-Local Underlay CIDR, otherwise, it should be in the same subnet as the WAN Interface CIDR. | | Remote ASN | The AS Number of the remote BGP peer. | | Remote LAN IP | The IP address of the remote BGP peer. | For the Management interface, you will need the Egress IP address. | **MGMT Interface** | **Description** | | ----------------------- | ---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- | | IP Assignment | The MGMT interface defaults to DHCP. This setting cannot be changed. The Edge Gateway will automatically NAT out of the physical MGMT interface of the edge node when using the Aviatrix Edge platform. Please see the Known Issue regarding the Management interface IP assignment. | | Egress CIDR (Primary) | The Egress CIDR is the public IP address which the Management interface uses. If the Public IP is used from Edge Gateway Management interface to establish connectivity to Aviatrix Controller, then configure the Public IP as the CIDR. The CIDR is then added to the Controller security group to allow incoming traffic from the Edge Gateway. | | Egress CIDR (Secondary) | The Egress Public IP for the secondary Edge Gateway's Management interface when High Availability is configured. | ## 3. Provide Network Access Aviatrix Edge Transit Gateway requires outbound access to communicate with the Aviatrix Platform. You must allow access on the specified ports on your firewall. For all Edge Gateway outbound access requirements, see [Aviatrix Products: Required Access for External Sites](https://aviatrix.zendesk.com/hc/en-us/articles/4417312119437-Aviatrix-Products-Required-Access-for-External-Sites) on the Aviatrix Customer Support website.