How BGP Advertises Mobile User IP Address Pools for Service Connections and Remote Network Connections

If you enable BGP for service connections or remote network connections, after you Configure Prisma Access for Users, Prisma Access allocates the mobile user IP address pools you specified using Class C (/24) address blocks. BGP therefore advertises allocated mobile user subnets in blocks of /24, rather than the entire pool(s) associated with that region. When Prisma Access adds a /24 subnet for a Prisma Access gateway, it automatically sends a BGP advertisement. As subnets are added and removed, Prisma Access automatically updates its BGP advertisements. This allocation method provides more flexibility when advertising BGP routes, especially if you configured a
Worldwide
pool instead of allocating pools per region. Dividing the IP address pool into smaller subnets allows the same subnet to be added, removed, or deleted and then reused in different regions when allocated address space is exhausted.
The following screenshot, from
Panorama
Cloud Services
Status
Network Details
Mobile Users
, shows three /20 IP pools for mobile users divided by region.
mobile-users-ip-pools.png
The
RIB Out
table, from
Panorama
Cloud Services
Status
Network Details
Service Connection
Show BGP Status
(in the
Branch AS and Router
area), shows the mobile users address pool divided into blocks of /24 subnets for BGP route advertisements. Note that the entire /20 subnets are not advertised.
bgp-status-rib-out.png

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