As new neighbors are added to the network or existing neighbors lose connectivity, the
adjacencies in the topology map are modified accordingly through the exchange (or
absence) of LSAs. These LSAs advertise only the incremental changes in the network,
which helps minimize the amount of OSPF traffic on the network. The adjacencies are
shared and used to create the network topology in the topological database.
OSPF Version 3
OSPFv3 is a modified version of OSPF that supports IP version 6 (IPv6) addressing.
OSPFv3 differs from OSPFv2 in the following ways:
•
All neighbor ID information is based on a 32-bit router ID.
•
The protocol runs per link rather than per subnet.
•
Router and network link-state advertisements (LSAs) do not carry prefix information.
•
Two new LSA types are included: link-LSA and intra-area-prefix-LSA.
•
Flooding scopes are as follows:
•
Link-local
•
Area
•
AS
•
Link-local addresses are used for all neighbor exchanges except virtual links.
•
Authentication is removed. The IPv6 authentication header relies on the IP layer.
•
The packet format has changed as follows:
•
Version number 2 is now version number 3.
•
The db option field has been expanded to 24 bits.
•
Authentication information has been removed.
•
Hello messages do not have address information.
•
Two new option bits are included: R and V6.
•
Type 3 summary LSAs have been renamed inter-area-prefix-LSAs.
•
Type 4 summary LSAs have been renamed inter-area-router-LSAs.
Related
Documentation
Understanding OSPF Areas and Backbone Areas•
• Understanding OSPF Configurations
• Example: Disabling OSPFv2 Compatibility with RFC 1583
Copyright © 2017, Juniper Networks, Inc.546
ACX Series Universal Access Router Configuration Guide
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