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 : Explicit Marking and Prioritized Treatment of Specific
OSPF Packets for Faster IGP Convergence and Improved
Network Scalability and Stability
Author(s) : V. Sapozhnikova, G. Choudhury
Filename : draft-ietf-ospf-scalability-02.txt
Pages : 15
Date : 2002-11-7
In this draft we propose the following mechanisms to improve
the scalability and stability of OSPF-based network:
(1) Process the Hello packets at a higher priority compared to other
OSPF packets. In order to facilitate this, explicitly mark the
Hello packets, to differentiate them from other OSPF packets.
One way of special marking is to use a different Diffserv
codepoint for Hello packets compared to other OSPF packets.
(2) In the absence of special marking, or in addition to it, use
other mechanisms in order not to miss Hello packets. One example
is to treat any packet received over a link as a surrogate for
a Hello packet (an implicit Hello) for the purpose of keeping
the link alive.
(3) The same type of explicit marking and prioritized treatment may
be beneficial to other OSPF packets as well. One important
example is LSA acknowledgment packet that can reduce
retransmissions during periods of congestion. Other examples
include (a) Database description (DBD) packet from a slave that
is used as an acknowledgement, and (b) LSAs carrying intra-area
topology change information.
It is possible that some implementations are already using one or
more of the above mechanisms in order not to miss the processing of
critical packets during periods of congestion. However, we suggest
the above mechanisms to be included as part of the standard so that
all implementations can benefit from them.
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