From: Joe Chang (changjoe@earthlink.net)
Date: Tue Jun 29 2004 - 20:25:42 GMT-3
Because the ingress switch determines the source-path based on an
approximate knowledge of the network. That is why a signalling process needs
to confirm the validity of that path before establishing the circuit. Why
give up an established, QoS-valid VC based on only speculative information
about a better path?
----- Original Message -----
From: "Edet Nkposong" <edetn@microsoft.com>
To: "Joe Chang" <changjoe@earthlink.net>
Cc: <gladston@br.ibm.com>; <ccielab@groupstudy.com>
Sent: Tuesday, June 29, 2004 9:38 AM
Subject: RE: ATM SVC
> Hello,
> Maybe I don't understand your response but PNNI uses the Dijkstra
> Algorithm
> To compute the shortest path so why wont it re-route when a better path
> that
> Satisfies the same QoS (using CAC) requirements is available.
>
> Regards, Edet
>
> -----Original Message-----
> From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf Of
> Joe Chang
> Sent: Tuesday, June 29, 2004 1:52 PM
> To: gladston@br.ibm.com; ccielab@groupstudy.com
> Subject: Re: ATM SVC
>
> My understanding is that ATM's PNNI is not a best path routing protocol
> in
> the same sense as RIP or OSPF. So long as the nodes can maintain
> established
> QoS for a VC the switching path will go unchanged. Compare with MPLS
> which
> would make your topology switch back to a shorter path upon recovery of
> the
> direct link.
>
> ----- Original Message -----
> From: <gladston@br.ibm.com>
> To: <ccielab@groupstudy.com>
> Sent: Monday, June 28, 2004 11:29 AM
> Subject: ATM SVC
>
>
> > Does the LS1010 has the capability to discover that there is a better
> path
> between two points and reroute the call?
> >
> > This it the topology:
> >
> > RA------LS1010-1----------------------LS1010-2-----RB
> > | |
> > | |
> > +------------LS1010-3--------+
> >
> > LS1010-1 can reach LS1010-2 directly or through LS1010-3.
> > If the direct path goes down, LS1010-1 constructs the path through
> LS1010-3.
> > But when the directly path goes up again, the path keep using
> LS1010-3.
> > Is it a limitation of the PNNI?
> >
> > Thanks for any comments.
> >
> >
> _______________________________________________________________________
> > Please help support GroupStudy by purchasing your study materials
> from:
> > http://shop.groupstudy.com
> >
> > Subscription information may be found at:
> > http://www.groupstudy.com/list/CCIELab.html
>
> _______________________________________________________________________
> Please help support GroupStudy by purchasing your study materials from:
> http://shop.groupstudy.com
>
> Subscription information may be found at:
> http://www.groupstudy.com/list/CCIELab.html
>
> _______________________________________________________________________
> Please help support GroupStudy by purchasing your study materials from:
> http://shop.groupstudy.com
>
> Subscription information may be found at:
> http://www.groupstudy.com/list/CCIELab.html
This archive was generated by hypermail 2.1.4 : Sat Jul 03 2004 - 19:40:52 GMT-3