- Network > Virtual Routers > Router Settings > ECMP
Use the following fields to configure Equal-Cost Multiple Path settings.
Enabling, disabling, or changing ECMP on an existing virtual router causes the system to restart the virtual router, which might cause existing sessions to be terminated.
Symmetric Returnto cause return packets to egress out the same interface on which the associated ingress packets arrived. That is, the firewall will use the ingress interface on which to send return packets, rather than use the ECMP interface, so the
Symmetric Returnsetting overrides load balancing. This behavior occurs only for traffic flows from the server to the client.
Select the maximum number of equal-cost paths: (2, 3, or 4) to a destination network that can be copied from the RIB to the FIB. Default is 2.
Choose one of the following ECMP load-balancing algorithms to use on the virtual router. ECMP load balancing is done at the session level, not at the packet level. This means that the firewall (ECMP) chooses an equal-cost path at the start of a new session, not each time a packet is received.
Configure ECMP on a Virtual Router
Configure ECMP on a Virtual Router Use the following procedure to enable ECMP on a virtual router. The prerequisites are to: Specify the interfaces that ...
ECMP Load-Balancing Algorithms
ECMP Load-Balancing Algorithms Let’s suppose the Routing Information Base (RIB) of the firewall has multiple equal-cost paths to a single destination. The maximum number of ...
ECMP Network > Virtual Routers > Router Settings > ECMP Equal Cost Multiple Path (ECMP) processing is a networking feature that enables the firewall to ...
Verify ECMP A virtual router configured for ECMP indicates in the Forwarding Information Base (FIB) table which routes are ECMP routes. An ECMP flag (E) ...
ECMP Equal Cost Multiple Path (ECMP) processing is a networking feature that enables the firewall to use up to four equal-cost routes to the same ...
ECMP in Active/Active HA Mode
ECMP in Active/Active HA Mode When an active/active HA peer fails, its sessions transfer to the new active-primary firewall, which tries to use the same ...
Enable ECMP for Multiple BGP Autonomous Systems
Enable ECMP for Multiple BGP Autonomous Systems Perform the following task if you have BGP configured, and you want to enable ECMP over multiple autonomous ...
Egress Path and Symmetric Return
Egress Path and Symmetric Return Using PBF, you can direct traffic to a specific interface on the firewall, drop the traffic, or direct traffic to ...
ECMP Model, Interface, and IP Routing Support
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, ...