The MPLS-OPS Archive[Date Prev][Date Next][Thread Prev][Thread Next] [Date Index][Thread Index][Author Index][Subject Index] Fwd: Re: Re: Labels per link...
Customer routers, in the normal MPLS model, do not use labels. They are not PEs or P routers Roger Williams >From: "alok" <alok.dube@apara.com> >To: "Roger Clark Williams" <rogerw@nordlink.com> >Subject: Re: Re: [MPLS-OPS]: Labels per link... >Date: Tue, 10 Dec 2002 16:04:57 +0530 >X-Mailer: Microsoft Outlook Express 5.00.2615.200 > >are A and C customer routers or PE routers? > >----- Original Message ----- >From: Roger Clark Williams <rogerw@nordlink.com> >To: MPLS-ops Mailing List <mpls-ops@mplsrc.com> >Sent: Tuesday, December 10, 2002 1:21 PM >Subject: Fwd: Re: [MPLS-OPS]: Labels per link... > > > > Gopal is correct, at least as far as I know. Perhaps I can clarify, if >this > > drawing comes across well enough. > > > > A---\ > > C-----D > > B---/ > > > > > > Frame mode, or platform-wide labeling: > > Router C will advertise to D 2 routes; a route to A using one label, and a > > route to B using another label. > > Going the other direction, Router C will advertise to both A and B a route > > to D, sending the same label to both A and B. > > > > Cell-mode (a bunch of MPLS-aware ATM switches for instance): > > In the first instance, C would advertise to D 2 routes using two labels, > > just as before > > In the second instance however, C would advertise the route to D using two > > different labels, sending one to A and the other to B. > > > > This is because C would likely have two different VCs to D, which is > > effectively two completely different paths, each requiring a separate >label. > > > > I hope this helps. > > > > Roger Williams > > > > >Resent-Date: Tue, 10 Dec 2002 01:30:54 -0500 > > >X-Authentication-Warning: host.secure4-hosting.net: mplsrc12 set sender >to > > >mpls-ops-request@mplsrc.com using -f > > >Date: Mon, 9 Dec 2002 21:57:13 -0800 (PST) > > >From: "Gopal@Yahoo" <gnaganab@yahoo.com> > > >Subject: Re: [MPLS-OPS]: Labels per link... > > >To: nitin p <nitin_panj@yahoo.com>, alok <alok.dube@apara.com>, > > > mpls-ops@mplsrc.com, ppvpn@lyris.nortelnetworks.com > > >Resent-From: mpls-ops@mplsrc.com > > >X-Mailing-List: <mpls-ops@mplsrc.com> archive/latest/4956 > > >X-Loop: mpls-ops@mplsrc.com > > >Resent-Sender: mpls-ops-request@mplsrc.com > > > > > >Nitin, That is incorrect. Pls forward me if there is a > > >doc that supports your data. > > >In frame mode labels are unique to the router. There > > >is one big label space per router. Router assigns > > >labels to the prefixes in the routing table from this > > >space. > > > > > >If a prefix P is learned from neighbors on 2 different > > >interfaces(or we advertise to 2 neighbors on 2 > > >differnt interfaces), router assigns one unique label > > >to that prefix(it is often refered as local label). > > > > > >In label or local label = Label that router assigns to > > >a prefix. This label is one unique to the router, no > > >matter how many sources we learn from or, to how many > > >neighbors we advertise. > > > > > >Out label or remote label(s) = label this router > > >received from the neighbors. there can be more than > > >one remote/out label for a prefix(advertised by > > >different neighbors). > > > > > >You can play with your boxes to see this behaviour > > >indeed. > > > > > >rgds, > > >gopal > > > > > > > > >--- nitin p <nitin_panj@yahoo.com> wrote: > > > > Gopal, > > > > > > > > Adding to this discussion.. > > > > Don't we have the concept of having global and local > > > > labels. Global when there is one label pool in a > > > > router and all the interfaces are assigned labels > > > > from > > > > this pool so label values at two interafces on the > > > > same router will never be same. > > > > Local, is the one in which each interface has it > > > > pool > > > > of labels and two interface on the same box maight > > > > have same label values. > > > > Please correct me on this. > > > > > > > > Thanks, > > > > Nitin > > > > > > > > --- "Gopal@Yahoo" <gnaganab@yahoo.com> wrote: > > > > > > > > > > --- alok <alok.dube@apara.com> wrote: > > > > > > Hi All > > > > > > > > > > > > i need to know what is the standard > > > > implementation > > > > > > practice on labels for > > > > > > multipoint interfaces. > > > > > > > > > > > > If i have an ethernet network between routers, > > > > P > > > > > > routers connected to > > > > > > multiple P via ethernet... > > > > > > > > > > > > is a label unique +ACI-per neighbour+ACI- or > > > > > > +ACI-per interface+ACI- in this case > > > > > > > > > > What is ACI? > > > > > In frame-mode, (local)Label is unique to a > > > > > router(LSR). > > > > > > > > > > > > > > > > > for example, P-a, P-b and P-c are on the same > > > > > > ethernet LAN > > > > > > > > > > > > can u have label 111 between P-a and P-b for > > > > > egress > > > > > > trafficbetween a and b, > > > > > > and 111 between P-a and P-c for egress traffic > > > > > > between a and c? > > > > > > > > > > Yes. > > > > > > > > > > If router-A is the Egress for a prefix, net-A and > > > > if > > > > > local label for Net-A is 111. Then rtr-A adv 111 > > > > to > > > > > both rtr-b and rtr-c. > > > > > > > > > > Then, both rtr-b and rtr-c will have 111 as the > > > > > out-label for the prefix, net-A. > > > > > > > > > > > > > > > > > > > > > > -rgds > > > > > > Alok > > > > > > > > > > > > ------- > > > > > > The MPLS-OPS Mailing List > > > > > > Subscribe/Unsubscribe: > > > > > > http://www.mplsrc.com/mplsops.shtml > > > > > > Archive: > > > > > http://www.mplsrc.com/mpls-ops_archive.shtml > > > > > > > > > > > > > > > __________________________________________________ > > > > > Do you Yahoo!? > > > > > Yahoo! Mail Plus - Powerful. Affordable. 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