Quite right. RSVP-TE is only for path creation and setup. Actual bandwidth allocation information is disseminated to all TE devices using the IGP (OSPF Opaque LSA's and IS-IS wide metrics). This also leads to the current limitation of only running MPLS-TE within a single area of the link state IGP since the bandwidth information doesn't cross area boundaries. Each head end of TE tunnels should know what bandwidth is available through the entire tunnel path prior to RSVP signaling. Cheers, -Michael Cohen -----Original Message----- From: Irwin Lazar [mailto:[EMAIL PROTECTED]] Sent: Friday, May 25, 2001 10:25 AM To: 'Michael Cohen'; [EMAIL PROTECTED] Subject: RE: Isn't MPLS basically just ATM PNNI, but for layer 3? [7:5765] Just to clarify, most other vendors are now heading down the RSVP-TE road for MPLS LDP provisioning (or at the very least, they are agreeing to support RSVP-TE). The RSVP-TE vs. CR-LDP argument seems to finally be dying down. It should be noted that RSVP-TE is only for path creation and setup, it doesn't perform the same role as was envisioned for IntServ. If anyone is interested in comparing the two protocols, Data Connection has a good white paper on their site, which I link to from the MPLS Resource Center - www.mplsrc.com. Irwin -----Original Message----- From: Michael Cohen [mailto:[EMAIL PROTECTED]] Sent: Thursday, May 24, 2001 2:17 PM To: [EMAIL PROTECTED] Subject: RE: Isn't MPLS basically just ATM PNNI, but for layer 3? [7:5765] I think there might be some confusion as to where RSVP and CR-LDP are being used. Steve is correct in saying that Cisco is using RSVP and most other vendors are using CR-LDP for Traffic Engineering. Cisco is also using the proprietary TDP to distribute tags in their MPLS solution while other vendors are conforming to the MPLS standard LDP. Cisco does support LDP for tag distribution in their 12.0.10ST and higher software and plans on deploying it in 12.2T for availability on most platforms. I haven't heard Cisco planning support for CR-LDP with Traffic Engineering in the near future... -Mike -----Original Message----- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED]]On Behalf Of Stephen Skinner Sent: Thursday, May 24, 2001 12:13 PM To: [EMAIL PROTECTED] Subject: RE: Isn't MPLS basically just ATM PNNI, but for layer 3? [7:5758] guys, thanks for your imput ..... yes i was loosely discribing MPLS ...it does have all the functions you state... and more , i must be mistaken about the RVSP because i seem to remeber reading somewhere that cisco is favoring RSVP....and that there LDP is based on this but hey i must be mistaken ......... also the RFC you list does not come up as valid ont the ITEF...please can you re-send this many thanks steve >From: "Marc-Andre Giroux" >Reply-To: "Marc-Andre Giroux" >To: [EMAIL PROTECTED] >Subject: RE: Isn't MPLS basically just ATM PNNI, but for layer 3? [7:5723] >Date: Thu, 24 May 2001 08:56:43 -0400 > >Steve, > MPLS is alot more then just ATM PNNI at layer 3. Your statement is >semi true when talking about MPLS VPN's the concept does come from ATM but >there is so much more you can do with it go read on traffic engineering, >the >fish bowl effect, valued added services (VPNs) and the network protection. > > As for your other statement saying that cisco uses RSVP and everyone >else doesn't. This also is wrong. Cisco uses TDP wich is a label >distribution protocol that is proprietary but they also support the >standard >LDP (RFC 3630) that Juniper and Everyone else are supporting. Juniper >personnaly doesn't have as much support for LDP then RSVP-TE (rsvp has >existed for a couple of years its the TE extensions that are used in >Traffic >engineering). But when you start talking about this be sure to know what >you >are talking about. BTW you can't use LDP or TDP to do MPLS >traffic-Engineering ( and this is the killer app of MPLS). > > I hope this clarifies a few things, I also hope you don't take this >the wrong way but go read on the juniper site about RSVP-TE it will clarify >alot of things for you. Hope this was helpfull and if you have any >questions >don't be shy. > > >-----Original Message----- >From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED]]On Behalf Of >Stephen Skinner >Sent: May 24, 2001 3:37 AM >To: [EMAIL PROTECTED] >Subject: Re: Isn't MPLS basically just ATM PNNI, but for layer 3? >[7:5703] > > >hi, > >i to have been reading alot and working with MPLS..... > >i personally liken it to Switching more than routing >...i know it uses BGP and also uses static routes,but essentially it just >switches packets over pre-defined paths from device to device ....... > >I also see a future for this simply in the Telco enviroment ....everyone >(cisco Juni and foundry are supporting it ...albeit in different >forms..cisc > >is using RSVP and everyone else isn`t) and the speed increases seem to be >worth it.... > > >but as ever only my workload and time will tell. > >steve > > > >From: "nrf" > >Reply-To: "nrf" > >To: [EMAIL PROTECTED] > >Subject: Isn't MPLS basically just ATM PNNI, but for layer 3? [7:5660] > >Date: Wed, 23 May 2001 21:18:21 -0400 > > > >I would like to hear some opinions on MPLS. I have been reading about >it, > >and, pardon me if I'm wrong, but it seems to me like just a reinvention >of > >ATM PNNI. > > > >I would be very interested in hearing some comments on the future of >MPLS. > >Particularly since ATM PNNI seemed to have gotten nowhere with the telcos > >(and I still don't completely understand why not), then why is MPLS going > >to > >do any better (or is it)? > > > >I would be particularly interested in hearing Howard Berkowitz's opinion >on > >the future of MPLS. > > > >Thanx > >FAQ, list archives, and subscription info: > >http://www.groupstudy.com/list/cisco.html > >Report misconduct and Nondisclosure violations to [EMAIL PROTECTED] > >_________________________________________________________________________ >Get Your Private, Free E-mail from MSN Hotmail at http://www.hotmail.com. >FAQ, list archives, and subscription info: >http://www.groupstudy.com/list/cisco.html >Report misconduct and Nondisclosure violations to [EMAIL PROTECTED] >FAQ, list archives, and subscription info: >http://www.groupstudy.com/list/cisco.html >Report misconduct and Nondisclosure violations to [EMAIL PROTECTED] _________________________________________________________________________ Get Your Private, Free E-mail from MSN Hotmail at http://www.hotmail.com. FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED] FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED] Message Posted at: http://www.groupstudy.com/form/read.php?f=7&i=5917&t=5917 -------------------------------------------------- FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
