Hỏi về RSVP-TE,CR-LDP,router alert label?

[tiendung0712]

Mình có 2 câu hỏi mong các bạn giải đáp giùm:
1. Sự khác nhau giữa RSVP-TE và CR-LDP?
2. Một gói có nhãn cảnh báo router (router alert label) sẽ được chuyển tiếp đi bằng phần mềm bỏ qua phần cứng.Vậy chuyển tiếp bằng phần mềm là gì?chuyển tiếp bằng phần cứng là gì?

[November02]

Hi,

What's the difference between CR-LDP and RSVP-TE
CR-LDP and RSVP-TE are both signaling mechanisms used to support Traffic Engineering across an MPLS backbone. RSVP is a QoS signaling protocol that is an IETF standard and has existed for quite some time. RSVP-TE extends RSVP to support label distribution and explicit routing while CR-LDP proposed to extend LDP (designed for hop-by-hop label distribution to support QoS signaling and explicit routing). MPLS Traffic Engineering tunnels are not limited to IP route selection procedures and thus will spread network traffic more uniformly across the backbone taking advantage of all available links. A signaling protocol is required to set up these explicit MPLS routes or tunnels.

There are many similarities between CR-LSP and RSVP-TE for constraint-based routing. The Explicit Route Objects that are used are extremely similar. Both protocols use ordered Label Switched Path (LSP) setup procedures. Both protocols include some QoS information in the signaling messages to enable resource allocation and LSP establishment to take place automatically.

Hix, đọc xong cũng lùng bùng luôn :|

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