Dell PowerConnect M6220 User's Guide - Page 608
Sequence, Checksum, Options, Rtr Opt., Displaying OSPFv3 Link State Database using the CLI Command
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• 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 and duplicate link state advertisements. The larger the sequence number, the more recent the advertisement. • Checksum - The checksum is used to detect data corruption of an advertisement. This corruption can occur while an advertisement is being flooded, or while it is being held in a router's memory. This field 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 optional capabilities 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 is clear, 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 the CLI Command For information about the CLI commands that perform this function, see the following chapter in the CLI Reference Guide: • OSPFv3 Commands 606 Configuring IPv6