Create a High-Bandwidth Network for a Remote Site

Create a high-bandwidth network for a remote site by combining multiple Prisma Access remote network connections.
If you want to secure your branch office or site for outbound internet access with a high-bandwidth connection to Prisma Access, you can load balance traffic from your branch office or site using multiple IPSec tunnels by completing the steps in this chapter.

Topology for High-Bandwidth Remote Network

The following diagram shows a sample topology for a branch location using multiple IPSec remote network tunnels between the site and Prisma Access. In this diagram, we use four 300 Mbps remote network tunnels to create a 1.2 Gbps throughput to traffic egressing to the internet. The CPE devices can be Palo Alto Networks next-generation firewalls or other devices that are capable of creating multiple IPSec tunnels and performing load balancing between these tunnels. One of the methods to achieve this is by enabling ECMP with session stickiness. The CPE must maintain session affinity per tunnel while applying ECMP over multiple tunnels.
This example shows four tunnels. The maximum number of tunnels you can use for a high-bandwidth connection in Prisma Access is based on the maximum number of IPSec tunnels your CPE devices support with the load balancing protocol you use (ECMP in this example).
high-bandwidth-remote-connection-active-only.png
Consider the following restrictions and recommendations before you deploy this configuration:
  • Use BGP routing for the IPSec tunnels; static routing is not supported.
  • Use this configuration for outbound internet access only.
  • Do not use tunnel monitoring on either Prisma Access or the CPE devices. Availability of the IPSec tunnel is determined by BGP peering between the CPE and Prisma Access’ remote network. If an IPSec tunnel goes down and BGP connection is interrupted, the routes learned over BGP on that tunnel are automatically removed from ECMP.
  • Because you use BGP to determine when a tunnel goes down, consider the HoldTime value you have configured on your CPE devices. The hold timer determines the amount of time that the tunnel is down before removing the route. Prisma Access uses the default BGP HoldTime value of 90 seconds as defined by RFC 4271. If you configure a lower hold time for the BGP CPE devices in the remote network site, BGP uses the lower hold time value. Palo Alto Networks recommends a KeepAlive value of 10 seconds and a HoldTime value of 30 seconds for your CPE devices with this deployment.

Create a High-Bandwidth Remote Network Connection

To create a high-bandwidth remote network connection, complete the following task.
  1. in Panorama, configure the Prisma Access remote network tunnels.
    1. (
      Optional
      ) if you haven’t already, set up IKE gateways, IKE crypto and IPSec crypto profiles, and IPSec tunnels for the remote network connections you create.
      Make a note of the IKE and IPSec cryptographic profiles; you specify the same settings on the CPE you use to terminate the remote network connection in the remote network location.
    2. Select
      Panorama
      Cloud Services
      Configuration
      Remote Networks
      and create four remote network connections, specifying the following settings:
      • Select a
        Bandwidth
        of
        300 Mbps
        .
      • Select the same
        Location
        for each connection.
      • Enable
        BGP and
        Advertise Default Route
        .
      • Specify the same
        Peer AS
        for all remote network connections.
        This example shows a
        Peer AS
        of 2000; in this example, you select a
        Peer AS
        of 2000 for all four connections.
      • (
        Optional
        ) if you want to create a backup remote network, create one by selecting
        Enable Secondary WAN
        ; then, select the
        IPSec Tunnel
        you created for the backup tunnel.
      high-bw-remote-connection-set-up-remote-network-tunnel.png
      When complete, you have four 300 Mbps remote network connections for the same location. If you configured backup tunnels, you also have four secondary tunnels to be used for failover purposes.
      high-bw-remote-connection-set-up-remote-network-tunnel-complete.png
    3. Select
      Panorama
      Cloud Services
      Status
      Network Details
      Remote Networks
      and make a note of the
      Service IP Address
      and
      EBGP Router
      addresses.
      You use the
      Service IP Address
      as the peer IP address when you configure the IPSec tunnel on the CPE devices in the remote network site, and you use these addresses and the
      EBGP Router
      addresses when you create static routes on the CPE devices.
      high-bw-remote-connection-set-up-remote-network-service-ip-address.png
  2. On the CPE devices in the remote network site, configure the remote network tunnels.
    The configuration in these steps use Palo Alto Networks next-generation firewalls; you can use any CPE device that supports IPSec tunnels and ECMP for this deployment.
    1. Create four active tunnels from the active CPE to each of the four network connections. For the
      Peer IP
      address, enter the
      Service IP Address
      of the remote network you received from Prisma Access in Step 1.c.
      high-bw-on-prem-firewall-1.png
    2. (
      Optional
      ) If you create backup tunnels, create them from the active CPE to each of the four network connections. For the
      Peer IP
      address, enter the
      Service IP Address
      of the remote network you received from Prisma Access in Step 1.c.
      high-bw-on-prem-firewall-2.png
  3. Configure ECMP on the CPE devices in the remote network site.
    1. Select
      Network
      Virtual Routers
      .
    2. Select the
      default
      virtual router, or
      Add
      a new virtual router.
    3. Select
      Router Settings
      Enable
      ECMP
      , then
      Enable
      ECMP with a
      Max Path
      of
      4
      and a load balance
      Method
      of
      Balanced Round Robin
      .
      high-bw-ecmp-on-prem-firewalls.png
  4. On the CPE devices in the remote network site, create static routes to the Prisma Access
    Service IP Address
    and
    EBGP Router
    IP addresses you retrieved in Step 1.c.
    As previously stated, dynamic routing with BGP is required for this configuration. To facilitate BGP connection between the CPE and Prisma Access’ eBGP router, you need to add a static route for the eBGP router IP address on the CPE, and the next-hop must be the tunnel interface on the CPE. You must repeat this step for all other Remote Network eBGP router IP addresses on remaining tunnels.
    The following example shows the route on the active CPE. If you created backup tunnels on a standby CPE, create the same routing on the standby CPE.
    If you are configuring a Palo Alto Networks next-generation firewall, select
    Static Routes
    IPv4
    to add the static routes.
    high-bw-on-prem-firewall-static-routes.png
  5. Enable route redistribution on the CPE devices by selecting
    Redistribution Profile
    IPv4
    , then
    Add
    an IPv4 route redistribution profile.
    high-bw-on-prem-firewall-route-distribution-profile.png
  6. Select
    BGP
    Peer Group
    ,
    Enable
    BGP on the virtual router instance, then
    Add
    Remote Network BGP peers.
    high-bw-on-prem-firewall-bgp-peers.png
  7. Select
    BGP
    Redist Rules
    , then attach the route redistribution profile you created in Step 5.
    high-bw-on-prem-firewall-bgp-redist-rules.png
  8. Validate that the CPE is passing traffic on all four of its tunnels.
  9. Check the status of the ECMP-enabled connections from Prisma Access.
    • Select
      Panorama
      Cloud Services
      Monitor
      Remote Networks
      , select the region where you deployed the ECMP connections, then select
      Status
      .
      In this area,
      ECMP
      displays as
      No
      . This is expected because you are not configuring the Prisma Access ECMP load balancing feature.
      high-bw-prisma-access-status.png
    • Select
      Statistics
      to see that traffic is passing through each remote network tunnel.
      high-bw-prisma-access-statistics.png
    When you have completed this workflow, you have created a high-bandwidth configuration for the remote network. Keep in mind that this solution is supported for outbound traffic only.

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