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Verifying Unicast RPF Status

 

Purpose

Verify that unicast reverse-path forwarding (RPF) is enabled and is working on the interface.

Action

Use one of the show interfaces interface-name commands with either the extensive or detail options to verify that unicast RPF is enabled and working on the switch. The example below displays output from the show interfaces ge- extensive command.

user@switch> show interfaces ge1/0/10 extensive

Meaning

The show interfaces ge-1/0/10 extensive command (and the show interfaces ge-1/0/10 detail command) displays in-depth information about the interface. The Flags: output field near the bottom of the display reports the unicast RPF status. If unicast RPF has not been enabled, the uRPF flag is not displayed.

On EX3200 and EX4200 switches, unicast RPF is implicitly enabled on all switch interfaces, including aggregated Ethernet interfaces (also referred to as link aggregation groups or LAGs) and routed VLAN interfaces (RVIs) when you enable unicast RPF on a single interface. However, the unicast RPF status is shown as enabled only on interfaces for which you have explicitly configured unicast RPF. Thus, the uRPF flag is not displayed on interfaces for which you have not explicitly configured unicast RPF even though unicast RPF is implicitly enabled on all interfaces on EX3200 and EX4200 switches.