The MPLS-OPS Archive[Date Prev][Date Next][Thread Prev][Thread Next] [Date Index][Thread Index][Author Index][Subject Index] Fwd: Stack
Amir, in a private question to Jim Guichard I asked the same question, just posed a different way: What are the total number of possible scenarios labels are used for these days? Generally, the stack wouldn't go more than 3 deep (VPN label, MPLS local label, TE tunnel label), but Jim did present a rare possible scenario with 4 labels. It is my understanding there is nothing in the standards that specifically limits the label depth, but there could be physical limitations of the gear in a given network that would limit the label stack that could cross a network. For instance, if the packet were labelled Do Not Fragment (DF) and the link MTU size was less than the packet size, the packet would be dropped. Normally this wouldn't be an issue for MPLS-aware gear, but for other/older gear it may well be a concern. You can ping IP across each hop but no VPN traffic will cross? Look for this issue as a possible problem. I hope this helps Roger Williams >Resent-Date: Sun, 22 Dec 2002 07:49:30 -0500 >X-Authentication-Warning: host.secure4-hosting.net: mplsrc12 set sender to >mpls-ops-request@mplsrc.com using -f >X-Originating-IP: [80.191.2.6] >From: "Amir Reza Minagar" <aminagar@hotmail.com> >To: mpls-ops@mplsrc.com >Date: Sun, 22 Dec 2002 15:50:00 +0330 >X-OriginalArrivalTime: 22 Dec 2002 12:20:00.0588 (UTC) >FILETIME=[72D9D0C0:01C2A9B4] >Subject: [MPLS-OPS]: Stack >Resent-From: mpls-ops@mplsrc.com >X-Mailing-List: <mpls-ops@mplsrc.com> archive/latest/5042 >X-Loop: mpls-ops@mplsrc.com >Resent-Sender: mpls-ops-request@mplsrc.com > >Dear All, > >Does anybody know if there is a maximum on the length >of the stack in MPLS packets? > >Regards, >Amir. > > > > > > >_________________________________________________________________ >MSN 8 with e-mail virus protection service: 3 months FREE*. > http://join.msn.com/?page=features/virus&xAPID=42&PS=47575&PI=7324&DI=7474&SU= > http://www.hotmail.msn.com/cgi-bin/getmsg&HL=1216hotmailtaglines_eliminateviruses_3mf > >------- >The MPLS-OPS Mailing List >Subscribe/Unsubscribe: http://www.mplsrc.com/mplsops.shtml >Archive: http://www.mplsrc.com/mpls-ops_archive.shtml ------- The MPLS-OPS Mailing List Subscribe/Unsubscribe: http://www.mplsrc.com/mplsops.shtml Archive: http://www.mplsrc.com/mpls-ops_archive.shtml |
|