The MPLS-OPS Archive[Date Prev][Date Next][Thread Prev][Thread Next] [Date Index][Thread Index][Author Index][Subject Index] RE: Re: label values
hi, i?d like to add some notes on packet classification: once a packet gets classified at the ingress there is no way for reclassification as the packet travels along it?s LSP (so far i know - pls. correct me if i am wrong) practicaly spoken a FEC per default is created per IGP prefix, for BGP routes there is no FEC creation, a BGP route gets mapped into the same FEC as its next-hop (learned via IGP) was mapped to. when using MPLS applications like VPN, TE and QoS we could also talk about classification of packets into special FECs - map a packet to a FEC to be forwarded/routed "against" a specific VRF - map a packet to a FEC to be forwarded/routed "against" a specific LSP tunnel - map a packet to a FEC to be treated referent to specific QoS specifications ... pls. be aware that all of this represents my understanding of the cisco implementation - would be nice to gain some infos about other vendors implemtations ! thx alex -----Original Message----- From: Hemant P. Kelkar [mailto:hemant@cyberspace.org] Sent: Donnerstag, 27. September 2001 18:33 To: adithya@sasken.com Cc: krishnakanth.rao@mail.cominsights.com; mpls-ops@mplsrc.com; mpls@UU.NET Subject: re: Re: label values Hi Aditya, Before classification, the 5 tuple Source IP + Destination IP + Service + Source Port + Destination Port or the tuple Source IP + Destination IP determines the flow. After classification since the flow is denoted by the label assigned, there is no further need of classification. -- Hemant Date: Thu, 27 Sep 2001 21:41:24 +0530 From: Adithya Bhat <adithya@sasken.com> To: Hemant P. Kelkar <hemant@cyberspace.org> Cc: krishnakanth.rao@mail.cominsights.com, mpls-ops@mplsrc.com, mpls@UU.NET Subject: Re: label values Hi Hemant, Once a label is assigned to a set of packets, the label effectively defines the "flow" through the LSP, So will it not be better to say that, packets will be classified based on the Labels ?? -Adithya "Hemant P. Kelkar" wrote: > Hi Krishnakanth, > Label values are of local significance only , limited significance between > the neighbour routers (LSRs). Hence, there may be same label values on two > different LSPs in the MPLS Domain. > Packets are classified into different FECs using a flow classifier e.g. > same source/destination IP addresses, and service types. (TCP port > numbers). > > -- > Hemant ------- 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
|
|