perfsonar development work

[Nicolas Simar <>]

Hi Danijel,

this is much better :-)

1) Reading you, do I understand that the RRD MA already provides the 
"nmwgt:hostName" when you request the data about the utilisation?

2) Forgive my ignorance, but what is "URL property in the SSH/Telent 
MP"? Does it has the same value as "nmwgt:hostName"?

3) If I read you properly, there are no modification required on the 
web-service code. We only need (i) some information ("nmwgt:hostName" 
and URL property from the Telnet/SSH MP to be configured with the same 
entries by the web-services deployers and (ii) all those services 
registering to the same LS. Have I understood you properly?
If this is the case, I am terribly thrilled by what you said!

4) To test the feature, you would need one network having fulfilled 3

Thanks a lot.

Cheers,
Nicolas



Danijel Matek wrote:
[snip]
> Hi,
>
> Ok, here it goes....
>
>
> Running Show Commands On Routers Along The Traceroute Path
> ==========================================================
>
> We want to initiate a set of requests based on traceroute output to get 
> the link utilization, interface drops and interface errors for all the 
> hops along the traceroute path. Further more we want to be able to 
> identify the routers hosting the interfaces so that we can run some show 
> commands through the SSH/Telenet MP on the identified routers.
>
>
> So, how do we do this???
> ------------------------
>
> We want to map "nmwgt:hostName" from the RRD MA with the URL property in 
> the SSH/Telent MP.
>
> Let's take a look at RRD MA service configuration specification.
> This is the part of the "Metadata_Configuration_specification.doc" for 
> the RRD MA:
>
> "Element-Name: nmwgt:hostName
> Mandatory: NO
> Description: Network element (router, switch) hostname. Should be a 
> loopback interface host name."
>
> This shows that we already have a means to get the router loopback 
> hostname.
>
> Problem 1: nmwgt:hostName is not Mandatory
> Suggestion: make it mandatory
>
> Problem 2: some routers don't have loopback interface host name, but 
> only IP address of the lo interface
> Suggestion: the description should say: "Network element (router, 
> switch) hostname or IP. Should be a loopback interface host name or IP.".
>
>
> At this point we can assume that when we get the info form the RRD MA 
> about the traceroute output given interface we'll get the hostname of 
> the router. (You can actually see this in VisualPerfSonar when you click 
> on a router icon in a google map or "show on map" link)
>
> In order for this demo to work we need to be sure that the 
> "nmwgt:hostName" is exactly the same as the URL property in the 
> SSH/Telent MP.
>
> This is the part of the "Service.Properties Configuration Files For 
> SSH/Telnet 1.0.doc":
> "URL property
> Name: service.r.mp.<device>.url
> <device> is the symbolic name specified in the device property.
> Mandatory: Mandatory
> Description: Represents the IP or Hostname of the device to be contacted"
>
>
> Suggestion( IMPORTANT !!! ): We have to make a rule that if there is a 
> hostname we'll use hostname in nmwgt:hostName and in URL property and if 
> we only have an IP address of a loopback interface will use the IP 
> address. This rule should be extended to all services that has loopback 
> hostname or IP address mentioned in its configuration. Why??? If we do 
> this well be able to correlate more services together in a very clear, 
> intuitive and simple way. By adding this simple rule we will 
> automatically extend perfsonar functionality.
>
> Note: This should not be for demo and testing purposes only!!!
>
>
> Client action:
> --------------
>
> 1. Client will take the addresses from the traceroute output and try to 
> contact the lookup service to ask for the RRD MA services that holds the 
> information about the addresses involved.
>
> 2. Connect to the given MA service get the bandwidth utilization data, 
> interface errors, interface drops and get the nmwgt:hostName.
>
> 3. Ask LS about SSH/Telnet MP for a given nmwgt:hostName.(See note)
>
> 4. Query the SSH/Telenet MP and run some show commands
>
> 5. Show the data in client
>
> Note: RRD MA is registering it's configuration to the LS and there for 
> the hostname element name. And even if it's not registering the 
> hostname, when the client is getting the info about the given interface 
> it gets the hostname. Based on the wiki SSH/Telnet MP is still not 
> registering to the LS so we can't ask LS for the location of SSH/Telnet 
> MP. For this case we can use some service discovery methods we were 
> using before the LS was created.
>
>
> Assumption: If Stajn has deployed SSH/Telnet MP with a router that has 
> its interfaces configured in Stajns RRD MA there is a great possibility 
> that we'll be able to run this demo right now.
>
>
> P.S.
> Please send me a note if you need me to elaborate something in more 
> detail or if something is not clear. And If you like this you can buy me 
> a beer on the next meeting. :-)
>
>
> Danijel

--
Nicolas
______________________________________________________________________

Nicolas Simar
Network Engineer

DANTE - www.dante.net

Tel - BE: +32 (0) 4 366 93 49
Tel - UK: +44 (0)1223 371 300
Mobile: +44 (0) 7740 176 883

City House, 126-130 Hills Road
Cambridge CB2 1PQ
UK
_____________________________________________________________________