The MPLS-OPS Archive

["alok" <alok.dube@apara.com>]

if there are no CSPF constraints other than bandwdith demand ....then.??
wot i need to figure out is why cant RSVP be treated independent of the
IGP's SPF...
are there  no TLVs to point out to RSVP that there is a better path based on
"desired constraints", even though its not the IGPs best path?
rgds
Alok

----- Original Message -----
From: fraanro <fraanro@arrakis.es>
To: alok <alok.dube@apara.com>
Cc: fraanro <fraanro@arrakis.es>; <mpls-ops@mplsrc.com>
Sent: Wednesday, August 14, 2002 5:21 PM
Subject: Re: [MPLS-OPS]: ISIS versus OSPF as IGP


now, if the entire bandwidth between A and B on ab1 is used up,
> will RSVP be
> able to use ab2 ? will the results be same for OSPF and IS-IS?
> please note im not talking about link failure, im talking about
> using an
> non-congested path....
>
> how will OSPF behave in this scenario? and how will ISIS behave? when
> coupled with RSVP??

Both will have the same behaviour. CSPF will remove from its
computation any link that does not match the constraints (bandwith,
color of the link, ..). That will happen regardless you are using ISIS
or OSPF.


----- Mensaje Original -----
Remitente: "alok" <alok.dube@apara.com>
Fecha: Miércoles, Agosto 14, 2002 8:15 am
Asunto: Re: [MPLS-OPS]: ISIS versus OSPF as IGP

> What do you mean with that? With both ISIS and OSPF you can do TE
> basedon constraints like bandwith request,link coloring, or even
> metric,that leads to paths not following the IGP best path.
>
>
> ------>
>
> let me elaborate...
> lets assume i have 2 links between routers A and B ..lets call
> them link ab1
> and ab2
> ab1 has better bandwidth and  is the "chosen" path between A and B
> by the
> IGP.
>
> now im using RSVP to set up MPLS based LSPs and some of these LSPs
> traverseacross A-B using ab1
>
> now, if the entire bandwidth between A and B on ab1 is used up,
> will RSVP be
> able to use ab2 ? will the results be same for OSPF and IS-IS?
> please note im not talking about link failure, im talking about
> using an
> non-congested path....
>
> how will OSPF behave in this scenario? and how will ISIS behave? when
> coupled with RSVP??
> rgds
> Alok
>
>
>





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