Enable or Disable Prefix Validation for Best Path Calculations

The default behavior is to allow prefix validation for all prefixes when performing best path calculations. Prefix validation is enabled by default. Use this command to enable or disable prefix validation when calculating best paths. This configuration is performed from the address-family context within route map mode.

Before you begin

You must be within one of the following modes.

BGP address-family IPv4 unicast configuration mode
BGP address-family IPv6 unicast configuration mode
BGP address-family IPv4 unicast VRF configuration mode
BGP address-family IPv6 unicast VRF configuration mode

Procedure

Navigate to the router bgp context.

SLX(config)# router bgp
SLX(config-bgp-router)#

Navigate to the address-family context. Choose the correct address family that you want to configure this setting for.

SLX(config-bgp-router)#
SLX(config-bgp-router)# address-family ipv4 unicast
SLX(config-bgp-router)# bestpath prefix-validation disable

Disable prefix validation. The no format of this command enables prefix validation. Validation of prefixes is the default configuration.
```
SLX(config-bgp-router)# bestpath prefix-validation disable
SLX(config-bgp-router)#
                    
```
Prefix validation is disabled for IPv4 addresses when calculating best path.

Example

The following example summarizes the commands in this procedure. This command disable prefix validation when calculating best path.

SLX# configure terminal
SLX(config)# router bgp 
SLX(config-bgp-router)# address-family ipv4 unicast 
SLX(config-bgp-ipv4u)# bestpath prefix-validation disable
SLX(config-bgp-ipv4u)#