RFC 3214 (rfc3214) - Page 2 of 11
LSP Modification Using CR-LDP
Alternative Format: Original Text Document
RFC 3214 LSP Modification Using CR-LDP January 2002
Table of Contents
1. Conventions Used in This Document ............................ 2
2. Introduction ................................................. 2
3. LSP Modification Using CR-LDP ................................ 3
3.1 Basic Procedure for Resource Modification .................. 3
3.2 Rerouting LSPs ............................................. 5
3.3 Priority Handling .......................................... 6
3.4 Modification Failure Case Handling ......................... 6
4. Application of LSP Bandwidth Modification in Dynamic Resource
Management ................................................... 7
5. Acknowledgments .............................................. 8
6. Intellectual Property Considerations ......................... 8
7. Security Considerations ...................................... 8
8. References ................................................... 8
9. Authors' Addresses ........................................... 9
10. Full Copyright Statement ..................................... 11
1. Conventions Used in This Document
L: LSP (Label Switched Path)
L-id: LSPID (LSP Identifier)
T: Traffic Parameters
R: LSR (Label Switching Router)
FEC: Forwarding Equivalence Class
NHLFE: Next Hop Label Forwarding Entry
FTN: FEC To NHLFE
TLV: Type Length Value
The key words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT",
"SHOULD", "SHOULD NOT", "RECOMMENDED", "MAY", and "OPTIONAL" in this
document are to be interpreted as described in RFC 2119 [4].
2. Introduction
Consider an LSP L1 that has been established with its set of traffic
parameters T0. A certain amount of bandwidth is reserved along the
path of L1. Consider then that some changes are required on L1. For
example, the bandwidth of L1 needs to be increased to accommodate the
increased traffic on L1. Or the SLA associated with L1 needs to be
modified because a different service class is desired. The network
operator, in these cases, would like to modify the characteristics of
L1, for example, to change its traffic parameter set from T0 to T1,
without releasing the LSP L1 to interrupt the service. In some other
cases, network operators may want to reroute a CR-LSP to a different
path for either improved performance or better network resource
utilization. In all these cases, LSP modification is required. In
section 3 below, a method to modify an active LSP using CR-LDP is
Ash, et al. Standards Track