A New Internet-Draft is available from the on-line Internet-Drafts directories.
This draft is a work item of the Open Shortest Path First IGP Working Group of the
IETF.
Title : OSPF Shortcut ABR Enhanced OSPF ABR Behavior
Author(s) : A. Zinin
Filename : draft-ietf-ospf-shortcut-abr-01.txt
Pages : 18
Date : 11-Oct-99
OSPF [Ref1] is a link-state intra-domain routing protocol used for
routing in IP networks. Though the definition of the ABR in the
current OSPF specification does not require a router with multiple
attached areas to have a backbone connection, it is actually
necessary to provide successful routing to the inter-area and
external destinations. If this requirement is not met all traffic,
destined for the areas not connected to such an ABR or out of the
OSPF domain, is dropped. The rules of originating and processing
Summary-LSAs given in the current OSPF standard [Ref1] can also
result in suboptimal inter-area routing. Though all these problems
can be fixed using virtual links, this memo describes an alternative
implementation of the OSPF ABR behavior, which allows the
administrator to avoid it or, if virtual links are still used, to
decrease the number of configured virtual links.
This memo also describes possible situations where the proposed
implementation can be used.
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