Question on PIM Auto-RP and Mapping Agents

Hi Experts,
I have a few basic questions about PIM Auto-RP mechanism.
Please correct my understanding about these below :
Question 1 -
A router, when configured with the command 'ip pim send-rp-announce loopback0 scope 16' announces itself as RP on the multicast address 224.0.1.39. And, the Mapping Agent listens to these messages on 224.0.1.39 and sorts them as (RP,Groups) and re-announces them on 224.0.1.40.
Question 2 -
We know that RP is basically a mechanism for the sparse PIM mode wherein the routers get access to the multicast tree by reaching the RP router. If that is the case, then how do the routers actually get to know about the Auto-RP multicast group 224.0.1.39/40, in order for it to reach the actual RP for the actual multicast group it needs to join ?
Does it mean that the groups 224.0.1.40 and 224.0.1.39 always works in Dense mode fashion that it reaches all routers and is not pruned (as all routers need to disseminate the Auto-RP discovery information .. ?
Question 3 -
I am thinking of trying a multicast configuration on the routers using static-groups and join-group commands.. Would you know of some real nice useful links that have sample multicast lab examples ?
I know there will be a lot of great replies :-)
Cheers
Arav

A1) Yes thats correct announcement on .39 and discovery on .40
A2) For auto-RP to work sparse-dense mode has to be configured. Announcement and discovery happens in dense fashion and when S,G mapping are available it goes the sparse way.There are workarounds to make it work with sparse only, but its better to skip that when deploying in a live environment.
A3) You may not find anything on a link for Multicast Lab as such, but you can try to setup 5 to 8 routers to have a meaningful experimentation with multicast where you can designate 1 end always as source and 1 end as receiver and then play with the core using sparse, dense and sparse-dense, using single RP, multiple RP's.
HTH-Cheers,
Swaroop

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    Copyright © 2002–2007 Apple Inc.
    You may incorporate this Apple sample code into your program(s) without
    restriction.  This Apple sample code has been provided "AS IS" and the
    responsibility for its operation is yours.  You are not permitted to
    redistribute this Apple sample code as "Apple sample code" after having
    made changes.  If you're going to redistribute the code, we require
    that you make it clear that the code was descended from Apple sample
    code, but that you've made changes.
    modified by Yvan KOENIG (VALLAURIS, France)
    2011/12/08
    This version normalize pictures so that
    (1) the greater dimension become the width one (rotate left if needed)
    (2) this greater dimension is ruled by the property maxWidth defined below.
    property maxWidth : 400
    -- set it to fit your needs
    property done_foldername : "Normalized Images"
    property originals_foldername : "Original Images"
    property newimage_extension : "jpg"
    -- the list of file types which will be processed
    -- eg: {"PICT", "JPEG", "TIFF", "GIFf"}
    property type_list : {"TIFF", "GIFf", "PNGf", "PICT", "JPEG"}
    -- since file types are optional in Mac OS X,
    -- check the name extension if there is no file type
    -- NOTE: do not use periods (.) with the items in the name extensions list
    -- eg: {"txt", "text", "jpg", "jpeg"}, NOT: {".txt", ".text", ".jpg", ".jpeg"}
    property extension_list : {"tif", "tiff", "gif", "png", "pict", "pct", "jpeg", "jpg"}
    on adding folder items to this_folder after receiving these_items
              tell application "Finder"
                        if not (exists folder done_foldername of this_folder) then
      make new folder at this_folder with properties {name:done_foldername}
                        end if
                        set the results_folder to (folder done_foldername of this_folder) as alias
                        if not (exists folder originals_foldername of this_folder) then
      make new folder at this_folder with properties {name:originals_foldername}
                                  set current view of container window of this_folder to list view
                        end if
                        set the originals_folder to folder originals_foldername of this_folder
              end tell
              try
                        repeat with i from 1 to number of items in these_items
                                  set this_item to item i of these_items
                                  set the item_info to the info for this_item
                                  if (alias of the item_info is false and the file type of the item_info is in the type_list) or (the name extension of the item_info is in the extension_list) then
                                            tell application "Finder"
      --set name of this_item to "YK#" & (text -4 thru -1 of ("0000" & i))
                                                      my resolve_conflicts(this_item, originals_folder, "")
                                                      set the new_name to my resolve_conflicts(this_item, results_folder, newimage_extension)
                                                      set the source_file to (move this_item to the originals_folder with replacing) as alias
                                            end tell
      process_item(source_file, new_name, results_folder)
                                  end if
                        end repeat
              on error error_message number error_number
                        if the error_number is not -128 then
                                  tell application "Finder"
      activate
      display dialog error_message buttons {"Cancel"} default button 1 giving up after 120
                                  end tell
                        end if
              end try
    end adding folder items to
    on resolve_conflicts(this_item, target_folder, new_extension)
              tell application "Finder"
                        set the file_name to the name of this_item
                        set file_extension to the name extension of this_item
                        if the file_extension is "" then
                                  set the trimmed_name to the file_name
                        else
                                  set the trimmed_name to text 1 thru -((length of file_extension) + 2) of the file_name
                        end if
                        if the new_extension is "" then
                                  set target_name to file_name
                                  set target_extension to file_extension
                        else
                                  set target_extension to new_extension
                                  set target_name to (the trimmed_name & "." & target_extension) as string
                        end if
                        if (exists document file target_name of target_folder) then
                                  set the name_increment to 1
                                  repeat
                                            set the new_name to (the trimmed_name & "." & (name_increment as string) & "." & target_extension) as string
                                            if not (exists document file new_name of the target_folder) then
      -- rename to conflicting file
                                                      set the name of document file target_name of the target_folder to the new_name
                                                      exit repeat
                                            else
                                                      set the name_increment to the name_increment + 1
                                            end if
                                  end repeat
                        end if
              end tell
              return the target_name
    end resolve_conflicts
    -- this sub-routine processes files
    on process_item(source_file, new_name, results_folder)
      -- NOTE that the variable this_item is a file reference in alias format
      -- FILE PROCESSING STATEMENTS GOES HERE
              try
      -- the target path is the destination folder and the new file name
                        set the target_path to ((results_folder as string) & new_name) as string
                        with timeout of 900 seconds
                                  tell application "Image Events"
      launch -- always use with Folder Actions
                                            set this_image to open file (source_file as string)
                                            set {oldW, oldH} to dimensions of this_image
                                            if oldH > oldW then
                                                      set {oldW, oldH} to {oldH, oldW}
      rotate this_image to angle 270.0
                                            end if
                                            set |échelle| to maxWidth / oldW
                                            if |échelle| < 1 then scale this_image by factor |échelle|
      save this_image as JPEG in file target_path with icon
      close this_image
                                  end tell
                        end timeout
              on error error_message
                        tell application "Finder"
      activate
      display dialog error_message buttons {"Cancel"} default button 1 giving up after 120
                        end tell
              end try
    end process_item
    --{code}
    Yvan KOENIG (VALLAURIS, France)  jeudi 8 décembre 2011 21:25:33
    iMac 21”5, i7, 2.8 GHz, 12 Gbytes, 1 Tbytes, mac OS X 10.6.8 and 10.7.2
    My iDisk is : <http://public.me.com/koenigyvan>
    Please : Search for questions similar to your own before submitting them to the community

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