[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]
mpls draft-kini-isis-lsp-restoration-00.txt
NAME OF I-D:
<http://www.ietf.org/internet-drafts/draft-kini-isis-lsp-restoration-00.txt>
SUMMARY:
"Intermediate System to Intermediate System (IS-IS) protocol
extensions for Label Switched Path restoration", Curtis Villamizar, T. V.
Lakshman, Sriganesh Kini, Murali Kodialam, 11/08/2000,
<draft-kini-isis-lsp-restoration-00.txt>
Traffic engineering using MPLS involves the setting up of label
switched paths (LSP) possibly with explicit routing and with
bandwidth guarantees (for label switched paths). The reliability of
these LSPs can be increased by providing a backup LSP onto which
traffic can be switched upon failure of an element in the path of the
active LSP. Backup LSPs can be routed in a way that bandwidth can be
shared between backup links of more than one active path while still
guaranteeing recoverability for a set of failures. This sharing greatly
increases the network efficiency thereby increasing the number of LSPs
that can be carried while maintaining guarantees. Algorithms which can
route such recoverable LSPs while using only aggregate network usage
information are being developed. To route the active LSP and the
(possibly shared) backup LSP, the topology information of the network
is needed and this can be provided by a link state routing protocol
like IS-IS. This document describes the encoding of the additional
information within the link state protocol data unit (LSPdu) of IS-IS
to enable routing of shared backup paths.
RELATED DOCUMENTS:
"Shared backup Label Switched Path restoration", Curtis Villamizar, T. V.
Lakshman, Sriganesh Kini, Murali Kodialam, 11/08/2000,
<draft-kini-restoration-shared-backup-00.txt>
"ReSerVation Protocol with Traffic Engineering extensions.Extension for
Label Switched Path estoration", Curtis Villamizar, T. V. Lakshman,
Sriganesh Kini, Murali Kodialam, 11/08/2000,
<draft-kini-rsvp-lsp-restoration-00.txt>
"Open Shortest Path First (OSPF) protocol extensions for Label Switched
Path restoration", Curtis Villamizar, T. V. Lakshman, Sriganesh Kini,
Murali Kodialam, 11/08/2000, <draft-kini-ospf-lsp-restoration-00.txt>
WHERE DOES IT FIT IN THE PICTURE OF THE SUB-IP WORK:
It is in MPLS but the picture is broken. GMPLS == C control and
MPLS fits under GMPLS and over the others (OPT, TDM, ATM, FR, etc).
WHY IS IT TARGETED AT THIS WG:
This work is generic to MPLS restoration and not specific to any
underlying technology, such as optical switching.
JUSTIFICATION:
See <draft-kini-restoration-shared-backup-00.txt> for overall
description of this work.
Protocol extensions to ISIS specifically for MPLS/TE are being
handled in the MPLS WG rather than ISIS (as of last meeting if I
understood correctly) and therefore this work fits into MPLS.
The technique is generally applicable to MPLS and accommodated but
is not specific to MPLS used in optical networks, rings, switched
services, or TDM. Therefore the MPLS WG would be slightly preferred
over CCAMP. If MPLS restoration is supposed to happen in CCAMP,
then it belongs in CCAMP.