648 Configuring IPv6– Intra-Area-Prefix-LSA• Link ID — The Link State ID identifies the piece of the routing domain that is being described by theadvertisement. The value of the LS ID depends on the advertisement's LS type.• Age — The time since the link state advertisement was first originated, in seconds.• Sequence — The sequence number field is a signed 32-bit integer. It is used to detect old andduplicate link state advertisements. The larger the sequence number, the more recent theadvertisement.• Checksum — The checksum is used to detect data corruption of an advertisement. This corruptioncan occur while an advertisement is being flooded, or while it is being held in a router's memory. Thisfield is the checksum of the complete contents of the advertisement, except the LS age field.• Options — The Options field in the link state advertisement header indicates which optionalcapabilities are associated with the advertisement. The options are:– V6 — When clear, the link is excluded from IPv6 routing calculations.– E — Describes how AS-external-LSAs are flooded– MC — Describes whether IP multicast datagrams are forwarded according to the specifications in– N — Describes how Type-7 LSAs are handled– R — Shows whether the originator is an active router. The R option is the router bit, and when it isclear, routes that pass through the advertising node cannot be computed.– DC — Describes how the system handles demand circuits.• Rtr Opt. — Shows router-specific options.Displaying OSPFv3 Link State Database Using CLI CommandsFor information about the CLI commands that perform this function, see the following chapter in theCLI Reference Guide:• OSPFv3 CommandsThe following table summarizes the equivalent CLI commands for this feature.OSPFv3 Virtual Link ConfigurationUse the OSPFv3 Virtual Link Configuration page to define a new or configure an existing virtual link.To display this page, a valid OSPFv3 area must be defined through the OSPFv3 Area Configuration page.Table 10-21. OSPFv3 Link State Database CommandsCLI Command Descriptionshow ipv6 ospf database Displays information about the link state database when OSPFv3 isenabled.show ipv6 ospf database database-summary Displays the number of each type of LSA in the database and the totalnumber of LSAs in the database.
