Check Your Work

To verify that SCU is functioning properly in the Layer 3 VPN, use the following commands:

• show interfaces interface-name statistics
• show interfaces source-class source-class-name interface-name
• show interfaces interface-name (extensive | detail)
• show route (extensive | detail)
• clear interface interface-name statistics

You should always verify SCU statistics at the outbound SCU interface on which you configured the output statement. To check SCU functionality, follow these steps:

1. Clear all counters on your SCU-enabled router and verify they are empty.
2. Send a ping from the ingress CE router to the second CE router to generate SCU traffic across the SCU-enabled VPN route.
3. Verify that the counters are incrementing correctly on the outbound interface.

The following section shows the output of these commands used with the configuration example.

Step One:

Clear the Counters

user@pe2> clear interfaces statistics all

user@pe2> show interfaces so-0/0/0.0 statistics

  Logical interface so-0/0/0.0 (Index 6) (SNMP ifIndex 113) 

    Flags: Point-To-Point SNMP-Traps Encapsulation: PPP

    Protocol inet, MTU: 4470

      Source class                             Packets                Bytes

                      GOLD1                          0                    0

      Addresses, Flags: Is-Preferred Is-Primary

user@pe2> show interfaces source-class GOLD1 so-0/0/0.0    

    Protocol inet

      Source class                             Packets                Bytes

                      GOLD1                          0                    0

Step Two:

Ping from the Edge Router

user@ce1> ping 10.20.253.2 source 10.114.1.1 rapid count 10000

Step Three:                                    

Verify the Counters

user@scu> show interfaces source-class GOLD1 so-0/0/0.0

    Protocol inet

      Source class                             Packets                Bytes

                      GOLD1                      20000              1680000

user@scu> show interfaces so-0/0/0.0 statistics

  Logical interface so-0/0/0.0 (Index 6) (SNMP ifIndex 113) 

    Flags: Point-To-Point SNMP-Traps Encapsulation: PPP

    Protocol inet, MTU: 4470

      Source class                             Packets                Bytes

                      GOLD1                      20000              1680000

      Addresses, Flags: Is-Preferred Is-Primary

        Destination: 10.20.253/24, Local: 10.20.253.1