ECMP Settings
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ECMP Settings
- Network > Virtual Routers > Router Settings > ECMP
Use the following fields to configure equal-cost multi-path (ECMP)
settings.
ECMP Settings | Description |
---|---|
Enable | Enable ECMP. Enabling,
disabling, or changing ECMP on an existing virtual router causes
the system to restart the virtual router, which sometimes results
in the termination of existing sessions. |
Symmetric Return | (Optional) Select Symmetric Return to
cause return packets to egress out the same interface on which the
associated ingress packets arrived. This configures the firewall
to use the ingress interface when sending return packets instead
of the ECMP interface, which means that the Symmetric
Return setting overrides load balancing. This behavior
occurs only for traffic flows from the server to the client. |
Strict Source Path | By default, IKE and IPSec traffic originating
at the firewall egresses an interface that the ECMP load-balancing
method determines. Select Strict Source Path to ensure
that IKE and IPSec traffic originating at the firewall always egresses
the physical interface to which the source IP address of the IPSec
tunnel belongs. Enable Strict Source Path when the firewall has more
than one ISP providing equal-cost paths to the same destination. The
ISPs typically perform a Reverse Path Forwarding (RPF) check (or
a different check to prevent IP address spoofing) to confirm that
the traffic is egressing the same interface on which it arrived.
Because ECMP by default chooses an egress interface based on the
configured ECMP method (instead of choosing the source interface
as the egress interface), that will not be what the ISP expects
and the ISP can block legitimate return traffic. In this use case,
enable Strict Source Path so that the firewall
uses the egress interface that is the interface to which the source
IP address of the IPSec tunnel belongs. |
Max Path | 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). |
Method | 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.
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