The MPLS WG Archive[Date Prev][Date Next][Thread Prev][Thread Next] [Date Index][Thread Index][Author Index][Subject Index] Some doubts
Title: RE: Some doubts I believe the question really is, what's the use of having a label *stack*. Why not use just one label ? There're a few reasons, but the ones that are foremost on my mind are: 1) Multiple labels are useful when each one can not only direct a packet's path, but also provide insight into it's contents, bindings, etc... For example, the first label can indicate the path to follow, as well as the CoS. The next label can indicate that the Layer3 is IP. etc... 2) Another 'obvious' use is tunneling. The benefits of tunneling are also numerous, but above all it is a great way to transit a domain that isn't under your control. For example, an LSP heirarchy can be created as a packet transits an ISP, the ISP's carrier, the carrier's carrier, and back again. On each domain crossing, a new label is pushed on to the packet, routed internally, and removed at the egress. For more reasons, there are plenty of books on MPLS applications. Eyad -----Original Message-----
Greetings,
What's the use of having a LSP tunnel? Regards, Dhiraj Bhuyan
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