I didn't literally mean the LDAP protocol itself, although, I would definitely argue the "it does not scale" argument. I was trying to relate a simple interface similar to LDAP (which is a stripped down version of X.500) that would allow me to query a peer's view of the topological world. In addition, through simple notifications I could be told when changes have occurred on topologies of interest. I like Jeroen's P2P angle. I did a lot of work with the peer discovery mechanisms back when bit torrent first came out as a way to reduce tracker load. The concepts of nodes and super nodes to distribute topology is a cool idea, but we have a restricted peering model that would prevent any random NSA from communicating with any other random NSA. Of course, we could decide to change our model to more of a P2P relationship and what the sysadmin's across the world have heart attacks ;-) John On 2012-05-30, at 6:42 AM, Radek Krzywania wrote:
Hi, Regarding LDAP - it does not scale. It's just simple tree structure, not a graph so we can’t model too much with that. Never heard of any mechanisms for distributed maintenance. IMHO - Pro: easy to implement, Cons: all the rest.
Best regards Radek
___________________________________ Radoslaw Krzywania
Network Research and Development Poznan Supercomputing and Networking Center
radek.krzywania@man.poznan.pl +48 61 850 25 26
http://www.man.poznan.pl ___________________________________
-----Original Message----- From: nsi-wg-bounces@ogf.org [mailto:nsi-wg-bounces@ogf.org] On Behalf Of Jeroen van der Ham Sent: Wednesday, May 30, 2012 11:59 AM To: John MacAuley Cc: NSI WG Subject: Re: [Nsi-wg] Topology section
Hi,
On 29 May 2012, at 16:22, John MacAuley wrote:
Hot dang, a heated debate. I thought everyone had fallen into a volcano while in Iceland.
Some of the fire from the volcanoes spurred us back to the debate indeed ;)
I nearly swallowed my tongue when I read OSPF. I was hoping for something extremely simple that would just allow me to query a peer and control the retrieval of what they know. Something very similar in concept to a protocol like LDAP where I can list the top level branches of the tree (available networks), then do a detailed retrieval of the contents of a subtree (topology for the network). I would also like to put a watcher on a subtree to be notified when anything was updated.
I have no close experience with LDAP, how does it work with multiple distributed sources of information? What about the subtree notifications?
I am definitely big on reuse, but if my aging memory serves me correctly, the last time I implemented OSPF in a product it was not a trivial task. I need a bit more of trivial these days ;-)
I indeed meant an OSPF-like protocol. It may not be trivial, but it's a proven technology. It has some great extensibility features using the TLV fields.
If that's off the table, we could of course also look into peer-to-peer like systems. There is some great work on distributed storage using distributed hash tables (DHT) that may also be applicable to this situation.
Jeroen.
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