•
uRPF should not be configured on devices where group-VE, tunnel keep-alive packets, or OpenFlow is configured.
•
Counters or logging information is unavailable for uRPF hits.
•
After enabling reverse path check, you must reload the device for uRPF to be programmed.
•
Tunnel over user VRF should not be configured on a device on which uRPF is enabled.
ICX 6610 considerations
•
ICX 6610 devices support only strict mode configuration.
•
You can enable uRPF only in global configuration mode on ICX 6610 devices.
•
You cannot enable uRPF mode at the interface level on ICX 6610 devices.
•
uRPF is supported only in a homogeneous ICX 6610 stack.
•
uRPF is enabled on selective prefixes on ICX 6610 devices.
•
IPv4 routes which have a single path or ECMP path next hop learned on VE interfaces are only uRPF-enabled.
•
IPv4 unicast routed packets are supported on ICX 6610 devices for uRPF check.
•
You cannot enable RPF mode at the interface level on ICX 6610 devices.
•
Prefixes learned over IPv4 and IPv6 tunnel are not subjected to uRPF check on ICX 6610 devices.
•
Scaling numbers on the device remain intact after configuring uRPF.
ICX 7750 considerations
•
ICX 7750 devices support global mode and interface configuration mode.
•
Per-interface level configuration is available on VE interfaces and physical ports only.
•
IPv4 and IPv6 unicast routed packets are subjected to uRPF check on ICX 7750 devices.
•
Scaling numbers are reduced by half for the following system values when uRPF is enabled: ip-route, ip6-route, ip-route-
default-vrf, ip6-route-default-vrf, ip-route-vrf, ip6-route-vrf.
•
uRPF and MCT should not be configured together.
•
If for a route the number ECMP path is more than 8, the hardware automatically chooses to use loose mode check, despite the
configuration on the incoming interface.
•
If the interface is not uRPF enabled the traffic is not subjected to uRPF check.
•
If the interface is uRPF enabled both IPv4 and IPv6 traffic will be subjected to uRPF check.
Unicast Reverse Path Forwarding feasibility
The following table provides support information about uRPF.
TABLE 115
unicast Reverse Path Forwarding Feasibility
Device
Configurable mode
ECMP route
supported
Default route lookup
control
Non-Tunneled
Tunneled
IPv4
IPv6
IPv4
IPv6
ICX 6610
Strict mode
(Global
configuration)
Yes
N/A
Yes
No
No
No
ICX 7750
Strict mode
Yes
Yes
Yes
Yes
No
No
Unicast Reverse Path Forwarding feasibility
FastIron Ethernet Switch Layer 3 Routing
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