Re: draft-bonica-tunneltrace-02

[Ping Pan <pingpan@juniper.net>]

Neil,

neil.2.harrison@bt.com wrote:

> Ping/Loa,
> 
> Can you please be more specific about the 'problem' you are talking about
> here.....and are you both talking about the same problem or different
> problems?  It would help me at least understand better if you can explain:
> -	what is the problem?


Detect and locate detect data plane failures in LSPs.


> -	what is the impact on customers?


When there is a problem, without a good application, it may take hours 
for the operators to figure out where the problem is.... I am pretty 
sure BT had experienced this in the past. :-)

> -	how does the operator detect detect the problem in the 1st place?


Currently, operators read memory dumps from many LSRs to figure out if 
there is a label mismatch for a LSP.


> -	how does tunneltrace diagnose the problem?


To diagnose a LSP, the operators can use traceroute to verify LSP 
connectivity at each hop. The LSR where there is a label mismatch can be 
found rather quickly.


> -	what are the expected consequent actions to fix it?
> 


When a "bad" LSP is found, it's up to the operator to decide what to do 
with it.


Regards,

- Ping