Brocade Virtual ADX Switch and Router Guide (Supporting ADX v03.1.00) - Manual (Page 165)

Brocade Virtual ADX Switch and Router Guide 151
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Chapter
7
Configuring OSPFv3
This chapter describes how to configure OSPFv3 on a Virtual ADX system.
Overview
Open Shortest Path First (OSPF) is a link-state routing protocol. OSPF uses link state
advertisements (LSAs) to update neighboring routers about its interfaces and information on those
interfaces. The switch floods LSAs to all neighboring routers to update them about the interfaces.
Each router maintains an identical database that describes its area topology to help a router
determine the shortest path between it and any neighboring router.
This chapter describes the following:
• The differences between OSPF Version 2 (OSPFv2) and OSPF Version 3 (OSPFv3).
• The link state advertisement types for OSPF Version 3.
• How to configure OSPF Version 3.
• How to display OSPF Version 3 information and statistics.
Differences between OSPFv2 and OSPFv3
IPv6 supports OSPFv3 functions similarly to OSPFv2 (the current version that IPv4 supports),
except for the following enhancements:
• Support for IPv6 addresses and prefixes.
• While OSPFv2 runs per IP subnet, OSPFv3 runs per link. In general, you can configure several
IPv6 addresses on a router interface, but OSPFv3 forms one adjacency per interface only,
using the interface’s associated link-local address as the source for OSPF protocol packets. On
virtual links, OSPFv3 uses the global IP address as the source.
• You can run one instance of OSPF Version 2 and one instance of OSPFv3 concurrently on a
link.
• Support for IPv6 link state advertisements (LSAs).
In addition, Brocade implements some new commands that are specific to OSPFv3. This chapter
describes the commands that are specific to OSPFv3.
NOTE
Although OSPF Versions 2 and 3 function similarly to each other, Brocade has implemented the user
interface for each version independently of each other. Therefore, any configuration of OSPF Version
2 features do not affect the configuration of OSPFv3 features and vice versa.
NOTE
You are required to configure a router ID when running only IPv6 routing protocols.