GB2359445B - High availability label distribution protocol for label-switched networks - Google Patents

High availability label distribution protocol for label-switched networks

Info

Publication number
GB2359445B
GB2359445B GB0003447A GB0003447A GB2359445B GB 2359445 B GB2359445 B GB 2359445B GB 0003447 A GB0003447 A GB 0003447A GB 0003447 A GB0003447 A GB 0003447A GB 2359445 B GB2359445 B GB 2359445B
Authority
GB
United Kingdom
Prior art keywords
label
ldp
tcp
lsr
peers
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
GB0003447A
Other versions
GB0003447D0 (en
GB2359445A (en
Inventor
Adrian John Farrel
Paul John Brittain
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Metaswitch Networks Ltd
Original Assignee
Data Connection Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Data Connection Ltd filed Critical Data Connection Ltd
Priority to GB0003447A priority Critical patent/GB2359445B/en
Publication of GB0003447D0 publication Critical patent/GB0003447D0/en
Publication of GB2359445A publication Critical patent/GB2359445A/en
Application granted granted Critical
Publication of GB2359445B publication Critical patent/GB2359445B/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L45/00—Routing or path finding of packets in data switching networks
    • H04L45/50—Routing or path finding of packets in data switching networks using label swapping, e.g. multi-protocol label switch [MPLS]
    • H04L45/507—Label distribution
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L69/00—Network arrangements, protocols or services independent of the application payload and not provided for in the other groups of this subclass
    • H04L69/16—Implementation or adaptation of Internet protocol [IP], of transmission control protocol [TCP] or of user datagram protocol [UDP]
    • H04L69/161—Implementation details of TCP/IP or UDP/IP stack architecture; Specification of modified or new header fields
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L69/00—Network arrangements, protocols or services independent of the application payload and not provided for in the other groups of this subclass
    • H04L69/16—Implementation or adaptation of Internet protocol [IP], of transmission control protocol [TCP] or of user datagram protocol [UDP]
    • H04L69/163—In-band adaptation of TCP data exchange; In-band control procedures
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L69/00—Network arrangements, protocols or services independent of the application payload and not provided for in the other groups of this subclass
    • H04L69/40—Network arrangements, protocols or services independent of the application payload and not provided for in the other groups of this subclass for recovering from a failure of a protocol instance or entity, e.g. service redundancy protocols, protocol state redundancy or protocol service redirection
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L69/00—Network arrangements, protocols or services independent of the application payload and not provided for in the other groups of this subclass
    • H04L69/16—Implementation or adaptation of Internet protocol [IP], of transmission control protocol [TCP] or of user datagram protocol [UDP]

Abstract

The Label Distribution Protocol (LDP) specified by the IETF for the distribution of labels between Label-Switched Routers (LSRs) in a label-switched network uses a TCP session between LSR peers in order to distribute labels. TCP is notoriously difficult and inefficient to implement in a fault-tolerant manner, which means that LDP is not suitable for to use in a system that requires high-availability of the label distribution service. This also applies to the constraint-based variant of LDP, CR-LDP, also specified by the IETF, as it inherits the use of TCP sessions between LSR peers from the base LDP specification. The present invention enhances the LDP specification to allow LSR peers to recover from hardware or software faults that cause a failure of the TCP session between the LSR peers without the need for either peer to implement a fault-tolerant version of TCP.
GB0003447A 2000-02-16 2000-02-16 High availability label distribution protocol for label-switched networks Expired - Lifetime GB2359445B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB0003447A GB2359445B (en) 2000-02-16 2000-02-16 High availability label distribution protocol for label-switched networks

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB0003447A GB2359445B (en) 2000-02-16 2000-02-16 High availability label distribution protocol for label-switched networks

Publications (3)

Publication Number Publication Date
GB0003447D0 GB0003447D0 (en) 2000-04-05
GB2359445A GB2359445A (en) 2001-08-22
GB2359445B true GB2359445B (en) 2003-11-05

Family

ID=9885622

Family Applications (1)

Application Number Title Priority Date Filing Date
GB0003447A Expired - Lifetime GB2359445B (en) 2000-02-16 2000-02-16 High availability label distribution protocol for label-switched networks

Country Status (1)

Country Link
GB (1) GB2359445B (en)

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH1141253A (en) * 1997-07-24 1999-02-12 Hitachi Ltd Switching router

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH1141253A (en) * 1997-07-24 1999-02-12 Hitachi Ltd Switching router

Also Published As

Publication number Publication date
GB0003447D0 (en) 2000-04-05
GB2359445A (en) 2001-08-22

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Legal Events

Date Code Title Description
PE20 Patent expired after termination of 20 years

Expiry date: 20200215