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Incremental Label Announcement in LDP-GR Protocol Extension

This document introduces the incremental label announcement capability in the LDP-GR protocol extension. By re-advertising local bindings to peers upon GR restart and preserving label bindings, the protocol optimizes convergence and reduces unnecessary retransmissions, leading to improved performance. The ILA Capability TLV exchanged between LDP-GR peers allows for the support of ILA in different FEC types. Request and assign modes are defined for initiating and responding to ILA messages, enhancing label binding efficiency. Versions IDs and message structures are detailed for preserving and exchanging label bindings.

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Incremental Label Announcement in LDP-GR Protocol Extension

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  1. Incremental Label AnnouncementLDP GR Extensions@ IETF 81 Alton Lo (altonlo@cisco.com) Keyur Patel (keyupate@cisco.com) Vanson Lim (vlim@cisco.com)

  2. Motivation • LDP GR speaker re-advertise all its local bindings to all its peer upon GR restart. • By preserving all the label bindings and versioning the label binding, LDP-GR speaker should always advertise the “incremental” changes in label binding only. • By eliminating all the unnecessary retransmission of label bindings, this should reduce CPU spike and accelerate convergence.

  3. ILA Capability TLV LDP Initialization Message Exchanged between LDP GR Peers. ILA Extension defines a new Capability TLV which specifies the list of FEC Type supporting ILA. LDP Initialization Message contains: FT Session TLV = (0x0503) ILA Capability TLV LDP GR Peer ILA Capable LDP GR Peer ILA Capable

  4. New ILA FEC TLV • Used for both advertisement and withdraw label bindings • Describe the FEC Type • Two Modes: • Request Mode: initiate by LMR after restart • Assign Mode: send by LMS in response to ILA Request Message • Version ID is 64 bits

  5. Preserve Label Bindings LMS LMR LDP LB1 + ILA assign Msg ver1 LDP LB2 + ILA assign Msg ver2 Remote Label Bindings Local Label Binding LMS preserves its local bindings LMR preserves the remote bindings

  6. After GR restart LMS ILA request Message version 2 LMR Local Label Binding Remote Label Bindings ILA assign Message version 2

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