An administrator is configuring a BGP peer on a Data Center ION to learn routes from the core switch. The goal is to have the ION learn these…

In Palo Alto Networks Prisma SD-WAN, the BGP peer configuration includes a "Scope" parameter that controls the advertisement of learned routes. To redistribute routes learned from a BGP peer at one site (e.g., a Data Center) to all other remote sites within the SD-WAN fabric, the scope must be set to "Global". This setting explicitly instructs the ION device to advertise these prefixes to all other ION devices in the tenant. A "Local" scope would restrict the use of these learned routes to the local ION device only, preventing their advertisement across the overlay.

A. Set the "Admin Distance" to 20.

Administrative Distance is used for local route selection preference on the ION device; it does not control the redistribution of routes to other sites.

B. Enable "Graceful Restart".

Graceful Restart is a high-availability feature that prevents routing flaps during a BGP control plane restart, not a mechanism for controlling route advertisement scope.

D. Configure a "Prefix List" to deny all.

A "deny all" prefix list is a filter that would block all routes from being learned from the BGP peer, which is the opposite of the desired outcome.

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1. Palo Alto Networks Prisma SD-WAN Administrator’s Guide (Cloud-Managed), "Configure BGP" section.

Reference: In the table describing BGP Peer settings, the "Scope" parameter is defined. It states: "Select the scope for the BGP peer. Global—The routes learned from this BGP peer are available to all the sites in the tenant. Local—The routes learned from this BGP peer are available only to the local site." This directly supports the choice of "Global" scope for fabric-wide redistribution.

2. Palo Alto Networks Prisma SD-WAN Design and Operation (EDU-330) Courseware, Module on "Routing".

Reference: The official courseware explains that BGP is a key protocol for exchanging routing information between the SD-WAN fabric and the underlay network. It details that the "Scope" setting is the primary control for determining whether learned routes are kept local to the site or advertised globally to all other sites.