Re: [mpls-linux-general] Difference between ISI RSVP and KOM RSVP

[<pim...@in...>]

nitin panjwani wrote:

> HI James and ISBN guys ,

You can call me Pim :)
(it is IBCN by the way)

> I have two questions:
>
> 1)What is the difference between ISI RSVP and KOM
>   RSVP in : functionality  , implementation and other
>   features that affects the TE enhancement .

(please note that there is more involved then just the original
ISI work, see our web site for a brief explanation
http://dsmpls.atlantis.rug.ac.be)
I will only talk about our work:

* Support for DiffServ over MPLS
    * signaling through RSVP daemon (E-LSP only at the moment)
    * kernel support thanks to James and modified by Steven en Tom to
support DiffServ
* Explicitly routed LSPs
* DiffServ configuration scripts
* Mapping traffic based on protocol, destination, DSCP on LSP/EXP (based
on iptables, ip rule, multiple routing tables = extendable)

Not supported but will be very soon:
re-routing (already fixed a lot of problems in my tree)

Not supported, needs some work :
Intserv reservations for LSPs, L-LSP setup

TE signaling requiring more work:
resource affinity procedures, HELLO procedures

> 2)ISBN guys how many days did it take for you to
>   enhance the RSVP fetures in ISI RSVP ?

What we did is:
* merging BSD and Linux versions (NIST)
* add DS/MPLS support to James' MPLS (E and L LSPs)
* introduce empty TSPEC and FLOWSPEC (signaling, API, CLI) to support
E-LSPs
* introduced CoS TSPEC and FLOWSPEC (needs some more work to reflect to
current IETF draft, needed to support L-LSPs)
* integration, testing, bug fixing, documentation, web site ...
(I again refer to the web site for more information)

All in all we have been working on this for more then a year I guess.

> What kind of
>   network did you use for the implementatin?

12 node Linux network with 4 ifaces, running zebra OSPF

> and what
>   are the difficulties you faced initially for this
>   enhancement?

RSVP daemon: huge code base, some strange and legacy code (but it has a
lot features which makes implementing some non-trivial stuff almost
trivial and it is pretty well documented)
Linux integration: lot's of different grounds to cover (iptables,
rt-netlink, MPLS kernel code, ip rules, tc ...)

Pim.

>  Hope to hear some nice replies ,
>
>  Thanks in advance,
>  Nitin
>
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--
Pim Van Heuven
Ghent University - IMEC
Department of Information Technology (INTEC)
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