Re: [ns] RE: MPLS simulation with NS/2

[Onno Kievit <okievit@lucent.com>]

Hi Rick,

in the file ns-mpls-node.tcl you see there is a procedure called
"flow-erlsp-install {fec phb lspid}". As far as I know, this is the only
procedure in ns-2.1b8 that can bind flows to an ER-LSP. The variable phb has
been replaced in MNS v2 by the variable fid. So I don't think it is possible to
bind a flow to an ER-LSP based on its fid in ns-2.1b8.

Of course you could make a minor change in the MPLS code and replace the
variable phb by fid. This is fairly simple. Unfortunately it appears to me that
the variable phb isn't used at all by the MPLS module. I think it has just been
added to be used later. So replacing phb by fid probably won't help.

If you really need to bind a flow to an ER-LSP based on its fid, I would
recommend you to use ns-2.1b6 together with MNS v2.

Regards,

Onno


rick_whitner@agilent.com wrote:

> Perhaps you can help me with a question.  I am using the MPLS capability
> that comes with ns-2.1b8a (which I assume is some precursor to MNS 2.0).
> It appears that the fec is determined based on the destination address.
> Is it possible in that version to bind a flow to an er-lsp based on fid?
>
> Thanks,
> Rick
>
> -----Original Message-----
> From: Onno Kievit [mailto:okievit@lucent.com]
> Sent: Thursday, September 13, 2001 8:07 AM
> To: Tulius Lima; "\"ns-users\"@isi.edu'\\"@stamp.agilent.com; "
> <ns-users@isi.edu>\""@lucent.com
> Subject: Re: [ns] RE: MPLS simulation with NS/2
>
> Hi Munaf,
>
> I don't know your exact problem, but maybe this helps a bit.
>
> With MNS version 2 (MPLS extension for ns-2.1b6) you can set up ER-LSP's:
> $node setup-erlsp $FEC $route $LSPID
>
> You can bind flows to such a ER-LSP:
> $node bind-flow-erlsp $FEC $fid $LSPID
>
> Further you can assign a flow id to a source:
> $source set fid_ $fid
>
> Now if you reserve 1 flow id "a" for a VPN "a", then only sources of flow id
> "a" may use the LSPs you created: like a VPN.
>
> What you maybe also want to do is reserve resources on the LSP's of a VPN.
> This can be done by setting up CR-LSP's instead of ER-LSP's.
>
> Success!
>
> Onno
>
> Tulius Lima wrote:
>
> > > i am not sure whether mpls is implemented in ns2 ..... i guess not ...
> >
> >         Wrong! MPLS has been part of NS-2 since version 2.1b6.
> >         I am just not sure about the VPN stuff. Maybe it will have to be
> > implemented.
> >
> >         Tulius
> >
> > > > Munaf Ahmed
> > > > Metera Networks
> > > > www.metera.com
> > > > tel: 469-330-9022
> > > > email: mahmed@metera.com
> > > >
> > > > >  -----Original Message-----
> > > > > From:       Munaf Ahmed
> > > > > Sent:       Tuesday, September 11, 2001 2:16 PM
> > > > > To: 'ns-users@isi.edu'
> > > > > Cc: Munaf Ahmed
> > > > > Subject:    MPLS simulation with NS/2
> > > > >
> > > > > Hello,
> > > > >
> > > > > I am searching for a network simulator for MPLS
> > > > > and also RFC 2547 (VPNs based on MPLS/MP-BGP).
> > > > >
> > > > > Has anyone used NS-2 for this ?
> > > > >
> > > > > Appreciate any pointers.
> > > > >
> > > > > Thanks,
> > > > >
> > > > > Munaf Ahmed
> > > > >
> > > >