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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