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).
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.
- in Panorama, configure the Prisma Access remote network tunnels.
- 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.
- Selectand create four remote network connections, specifying the following settings:PanoramaCloud ServicesConfigurationRemote Networks
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.
- Select aBandwidthof300 Mbps.
- Select the sameLocationfor each connection.
- EnableBGP andAdvertise Default Route.
- Specify the samePeer ASfor all remote network connections.This example shows aPeer ASof 2000; in this example, you select aPeer ASof 2000 for all four connections.
- (Optional) if you want to create a backup remote network, create one by selectingEnable Secondary WAN; then, select theIPSec Tunnelyou created for the backup tunnel.
- Selectand make a note of thePanoramaCloud ServicesStatusNetwork DetailsRemote NetworksService IP AddressandEBGP Routeraddresses.You use theService IP Addressas 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 theEBGP Routeraddresses when you create static routes on the CPE devices.
- 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.
- Create four active tunnels from the active CPE to each of the four network connections. For thePeer IPaddress, enter theService IP Addressof the remote network you received from Prisma Access in Step 1.c.
- (Optional) If you create backup tunnels, create them from the active CPE to each of the four network connections. For thePeer IPaddress, enter theService IP Addressof the remote network you received from Prisma Access in Step 1.c.
- Configure ECMP on the CPE devices in the remote network site.
- Select.NetworkVirtual Routers
- Select thedefaultvirtual router, orAdda new virtual router.
- Select, thenRouter SettingsEnableECMPEnableECMP with aMax Pathof4and a load balanceMethodofBalanced Round Robin.
- On the CPE devices in the remote network site, create static routes to the Prisma AccessService IP AddressandEBGP RouterIP 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, selectto add the static routes.Static RoutesIPv4
- Enable route redistribution on the CPE devices by selecting, thenRedistribution ProfileIPv4Addan IPv4 route redistribution profile.
- Select,BGPPeer GroupEnableBGP on the virtual router instance, thenAddRemote Network BGP peers.
- Select, then attach the route redistribution profile you created in Step 5.BGPRedist Rules
- Validate that the CPE is passing traffic on all four of its tunnels.
- Check the status of the ECMP-enabled connections from Prisma Access.
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.
- Select, select the region where you deployed the ECMP connections, then selectPanoramaCloud ServicesMonitorRemote NetworksStatus.
- SelectStatisticsto see that traffic is passing through each remote network tunnel.
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