Brocade FastIron Ethernet Switch Layer 3 Routing Configuration Guide - Manual (Page 318)

OSPFv3 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
device 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.
IPv6 supports OSPF Version 3 (OSPFv3), which functions similarly to OSPF Version 2 (OSPFv2), the
current version that IPv4 supports, except for the following enhancements:
• Support for IPv6 addresses and prefixes.
• Ability to configure several IPv6 addresses on a device interface. (While OSPF V2 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 associated link-
local address as the source for OSPF protocol packets. On virtual links, OSPFv3 uses the global IP
address as the source.OSPFv3 imports all or none of the address prefixes configured on a router
interface. You cannot select the addresses to import.)
• Ability to run one instance of OSPF Version 2 and one instance of OSPFv3 concurrently on a link.
• Support for IPv6 link-state advertisements (LSAs).
This section describes the commands that are specific to OSPFv3.
NOTE
Although OSPF Version 2 and 3 function similarly to each other, Brocade has implemented the user
interface for each version independently of the other. Therefore, any configuration of OSPFv2 features
will 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.
Link-state advertisement types for OSPFv3
OSPFv3 supports the following types of LSAs:
• Router LSAs (Type 1)
• Network LSAs (Type 2)
• Interarea-prefix LSAs for ABRs (Type 3)
• Interarea-router LSAs for ASBRs (Type 4)
• Autonomous system external LSAs (Type 5)
• Link LSAs (Type 8)
• Intra-area-prefix LSAs (Type 9)
For more information about these LSAs, see RFC 2740.
OSPFv3 overview
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