OK - what I'm suggesting is discussing how this approach is similar to
LSR ping for numbered interfaces. I think it's a useful additional point
to make and helps motivate the need for the rest of the approach - for
unnumbered interfaces.

Joe

On 7/5/2016 11:29 AM, Ron Bonica wrote:
> Hi Joe,
>
> That's right. If we used LSR Ping, the probed interface would have to be 
> numbered.
>
>                                                   Ron
>
>
>> I'm speaking of a different case:
>>
>> - send a ping to interface B
>>     let's say that ping fails because you don't have a route to B
>>     that would fail for both ping and eping
>>
>> - send a ping to interface C
>>     let's say that works because you do have a route to C
>>     that would work for both ping and eping
>>
>> - send a ping LSR to B via C
>>     that ping seems like it would work now, i.e., LSR ping would reach B and 
>> get
>> a response through C even though B isn't directly reachable
>>     that would work for both ping and eping
>>
>> The unique aspect of eping is being able to ping (or get status) about
>> interfaces without names. Both LSR ping and eping are equally capable of
>> getting status about an *address* that is not otherwise reachable (e.g.,
>> because of routing issues).
>>
>> Joe

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