A New Internet-Draft is available from the on-line Internet-Drafts directories.
Title : LDP Extension for FRR Edge Node Protection in BGP-Free LDP Core
Author(s) : Ahmed Bashandy
Kamran Raza
Filename : draft-bashandy-mpls-ldp-bgp-frr-00.txt
Pages : 12
Date : 2012-03-05
Consider a BGP free core scenario with LDP running in the core.
Suppose the edge BGP speakers PE1 and PE2 know about a prefix P/m
via the external routers CE1 and CE2. If the edge LSR PE1 crashes
or becomes totally disconnected from the core, it is desirable for a
core LSR "P", that is carrying traffic to the failed edge LSR PE1,
to immediately restore traffic by re-routing packets destined to the
prefix P/m from the LSP terminating on PE1 to be forwarded over the
LSP terminating on PE2, until BGP reconverges. If the packets
originally flowing to the failed edge LSR PE1 are BGP labeled, then
the repairing core LSR P must swap the label (corresponding to
prefix P/m) advertised by the failed edge LSR PE1 with the label
advertised for the same prefix by the edge LSR PE2 before re-routing
the packets through an LSP terminating on PE2. To implement BGP edge
node protection in a BGP-free LDP core, this document proposes an
extension to LDP. This extension allows an LDP speaker running on a
Edge LSR Node (e.g. PE1) to inform the LDP speakers running on core
LSRs about the "Repair" edge LSR (e.g. PE2), as well as Repair LSR's
label for prefix P/m, if any.
A URL for this Internet-Draft is:
http://www.ietf.org/internet-drafts/draft-bashandy-mpls-ldp-bgp-frr-00.txt
Internet-Drafts are also available by anonymous FTP at:
ftp://ftp.ietf.org/internet-drafts/
This Internet-Draft can be retrieved at:
ftp://ftp.ietf.org/internet-drafts/draft-bashandy-mpls-ldp-bgp-frr-00.txt
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