Additional ECMP Settings
Let us learn more about the additional ECMP settings.
After you complete the basic configurations of ECMP, there are a few additional ECMP-related settings. Follow the sections to learn about each.
ECMP Region Location Detection
In version 3.0.1 onwards, ECMP automatically detects the closest Prisma Access location for a branch to connect. The closest location is determined by the values of Latitude/Longitude entered in the Site Details for a branch.
The CloudBlade API determines the country, and the local language support for the branch via the location. Wherever possible, it will connect that branch to the appropriate Prisma Access region with the language support for the country that the branch is in.
In 3.0.1 the region needs to be changed manually to a desired region, as shown below.
ECMP Bandwidth Detection
Starting with version 3.0.1, ECMP uses the circuit bandwidth to automatically set the Prisma Access bandwidth. To override this behavior, adjust the bandwidth for ECMP accordingly.
ECMP Configuration for a Single Link
Some organizations that plan on having two or more connections to a branch Prisma SD-WAN ION device can pre-configure ECMP with only a single link to a device. When configuring ECMP on a single link, the following notes/restrictions will apply.
- The link will appear as a non-ECMP link in Prisma Access.
- When a second link is configured/enabled for Prisma Access, the site will automatically enable ECMP with symmetric return in Prisma Access.
ECMP Circuit Usage and Exemption
By default, ECMP will build a Standard VPN to Prisma Access on up to four interfaces which are able to reach Prisma Access. This can include, but is not limited to Internet circuits (Cable, DSL, 3G/4G/5G/LTE) and Private WAN Circuits (MPLS).
ECMP does NOT look at the circuit category to bring up a path to Prisma Access. Rather, it looks at whether or not the circuit for a device has reachability to Prisma Access in order to add to the ECMP bundle.
There can be situations where certain circuit categories at a global level or circuits at a device level should be excluded or allowed to participate in ECMP. For example, Private WAN paths may not be required at an organization to become part of an ECMP bundle.
To accomplish this, the following tag can be applied globally or at the device level:
Application of the tag at the Device Interface or Global level will prevent ECMP from using that category or port for inclusion.
ECMP Branches with High-Availability
The 3.0.1 CloudBlade version also supports High-Availability designs, while allowing for licenses to be consumed by the Primary/Active Prisma SD-WAN ION device, while the backup Prisma SD-WAN ION device does not consume a license to Prisma Access.
To enable ECMP HA licensing, under the PRIMARY/ACTIVE Prisma SD-WAN ION device, enable the following
prisma_ha_primarytag as shown.
This signals to the CloudBlade to replicate the Standard VPN tunnels to Prisma Access to the backup/secondary unit. In the event of a changeover to the secondary Prisma SD-WAN ION device, the tunnels are already configured, but do not consume licensing.
ECMP Site-Level Interface Tags
As auto region selection and 3.0.1 are not inter-operable, for each link under the ECMP bundle/region, the local interface tags must also be applied as described in the previous section.
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