I have a query regarding configuration of Traffic engineering.Do we require to enable LDP/TDP or enable IBGP label carrying features?If not so then how the labels are distributed within the MPLS nodes.Does RSVP has the capability to distribute labels?Can anyone explain me the lablel assignment and distribution process relevant to RSVP configuration.
- The tail end uses the RESV message to send either an implicit or explicit null label to the penultimate hop router, which in turn allocates a label and send it to the upstream router also using the RESV message. This process continues till the RESV message reaches the head end router.
- The RSVP allocated label is generally used as the outter label or in other words the label that is used to get the traffic from the ingress to egress PE.
- If the route-record option is used then the RESV message will contain all the labels for the LSRs that have been traversed. This option is on by default when an LSP is protected using TE FRR.
- If one of the nodes fails to allocate a label then the LSP can't be established.
- RSVP doesn't assume that there is LSP in place between the ingress and egress PE. You could deploy an entire MPLS network solely using MPLS TE to build the LSPs between all of your PEs. There no dependancy between RSVP and LDP.
Hope this helps,
Harold Ritter Sr. Technical Leader CCIE 4168 (R&S, SP) email@example.com México móvil: +52 1 55 8312 4915 Cisco México Paseo de la Reforma 222 Piso 19 Cuauhtémoc, Juárez Ciudad de México, 06600 México
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