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Re: ISIS versus OSPF as IGP

  • From: "alok" <alok.dube@apara.com>
  • Date: Wed, 14 Aug 2002 11:45:19 +0530
  • Cc: <mpls-ops@mplsrc.com>
  • Resent-Date: Wed, 14 Aug 2002 03:13:21 -0400
  • To: "fraanro" <fraanro@arrakis.es>

What do you mean with that? With both ISIS and OSPF you can do TE based
on 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 traverse
across 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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