Brocade Communications Systems FastIron X Series User Manual

• uRPF should not be congured on devices where group-VE, tunnel keep-alive packets, or OpenFlow is congured.
• 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 congured on a device on which uRPF is enabled.
ICX 6610 considerations
• ICX 6610 devices support only strict mode
conguration.
• You can enable uRPF only in global conguration 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 prexes 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.
• Prexes learned over IPv4 and IPv6 tunnel are not subjected to uRPF check on ICX 6610 devices.
• Scaling numbers on the device remain intact after conguring uRPF.
ICX 7750 considerations
• ICX 7750 devices support global mode and interface
conguration mode.
• Per-interface level conguration 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 congured together.
• If for a route the number ECMP path is more than 8, the hardware automatically chooses to use loose mode check, despite the
conguration on the incoming interface.
• If the interface is not uRPF enabled the trac is not subjected to uRPF check.
• If the interface is uRPF enabled both IPv4 and IPv6 trac 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 Congurable mode
ECMP route
supported
Default route lookup
control
Non-Tunneled Tunneled
IPv4 IPv6 IPv4 IPv6
ICX 6610 Strict mode
(Global
conguration)
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
590 53-1003627-04

Brocade Communications Systems FastIron X Series Specifications

General

Brand	Brocade Communications Systems
Model	FastIron X Series
Category	Switch
Language	English