ECMP Model, Interface, and IP Routing Support

ECMP is supported on all Palo Alto Networks firewall models, with hardware forwarding support on the PA-7000 Series, PA-5200 Series, and PA-3200 Series. VM-Series firewalls support ECMP through software only. Performance is affected for sessions that cannot be hardware offloaded.
ECMP is supported on Layer 3, Layer 3 subinterface, VLAN, tunnel, and Aggregated Ethernet interfaces.
ECMP can be configured for static routes and any of the dynamic routing protocols the firewall supports.
ECMP affects the route table capacity because the capacity is based on the number of paths, so an ECMP route with four paths will consume four entries of route table capacity. ECMP implementation might slightly decrease the route table capacity because more memory is being used by session-based tags to map traffic flows to particular interfaces.
Virtual router-to-virtual router routing using static routes does not support ECMP.

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