draft-ietf-mpls-ldp-igp-sync-bcast-03.txt   draft-ietf-mpls-ldp-igp-sync-bcast-04.txt 
MPLS Working Group S. Kini (Ed) MPLS Working Group S. Kini (Ed)
Internet Draft W. Lu (Ed) Internet Draft W. Lu (Ed)
Intended Status: Standards Track Ericsson Updates: 5443 (if approved) Ericsson
Expires: January 2011 July 2, 2010 Intended Status: Informational September 13, 2010
Expires: March 2011
LDP IGP Synchronization for broadcast networks LDP IGP Synchronization for broadcast networks
draft-ietf-mpls-ldp-igp-sync-bcast-03.txt draft-ietf-mpls-ldp-igp-sync-bcast-04.txt
Status of this Memo Status of this Memo
This Internet-Draft is submitted to IETF in full conformance with the This Internet-Draft is submitted to IETF in full conformance with the
provisions of BCP 78 and BCP 79. provisions of BCP 78 and BCP 79.
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other groups may also distribute working documents as Internet- other groups may also distribute working documents as Internet-
Drafts. Drafts.
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and may be updated, replaced, or obsoleted by other documents at any and may be updated, replaced, or obsoleted by other documents at any
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material or to cite them other than as "work in progress." material or to cite them other than as "work in progress."
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This Internet-Draft will expire on January 3, 2011. This Internet-Draft will expire on March 17, 2011.
Copyright Notice Copyright Notice
Copyright (c) 2010 IETF Trust and the persons identified as the Copyright (c) 2010 IETF Trust and the persons identified as the
document authors. All rights reserved. document authors. All rights reserved.
This document is subject to BCP 78 and the IETF Trust's Legal This document is subject to BCP 78 and the IETF Trust's Legal
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(http://trustee.ietf.org/license-info) in effect on the date of (http://trustee.ietf.org/license-info) in effect on the date of
publication of this document. Please review these documents publication of this document. Please review these documents
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a link, the IGP advertises the link with maximum cost to avoid any a link, the IGP advertises the link with maximum cost to avoid any
transit traffic on the link if possible. When LDP becomes operational transit traffic on the link if possible. When LDP becomes operational
i.e., all the label bindings have been exchanged, the link is i.e., all the label bindings have been exchanged, the link is
advertised with its correct cost. This tries to ensure that all along advertised with its correct cost. This tries to ensure that all along
the IGP shortest path, the LDP LSP is available. The mechanisms in the IGP shortest path, the LDP LSP is available. The mechanisms in
[LDP-IGP-SYNC] have limitations when applied to a broadcast link. [LDP-IGP-SYNC] have limitations when applied to a broadcast link.
These are described in section 3. A solution is defined in section 4. These are described in section 3. A solution is defined in section 4.
2. Conventions used in this document 2. Conventions used in this document
The key words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALLNOT", The key words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT",
"SHOULD", "SHOULD NOT", "RECOMMENDED", "MAY", and "OPTIONAL" in this "SHOULD", "SHOULD NOT", "RECOMMENDED", "MAY", and "OPTIONAL" in this
document are to be interpreted as described in [RFC2119]. document are to be interpreted as described in [RFC2119].
3. Problem Statement 3. Problem Statement
On broadcast networks, a router's link-state advertisement (LSA) On broadcast networks, a router's link-state advertisement (LSA)
contains a single cost to the broadcast network, rather than a contains a single cost to the broadcast network, rather than a
separate cost to each peer on the broadcast network. The operation of separate cost to each peer on the broadcast network. The operation of
the mechanism in [LDP-IGP-SYNC] is analyzed using the sample topology the mechanism in [LDP-IGP-SYNC] is analyzed using the sample topology
of Figure 1 below where routers A, B, C and E are attached to a of Figure 1 below where routers A, B, C and E are attached to a
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