Dell PowerConnect 6248 User's Guide - Page 538

- Network Summary - ASBR Summary - AS-external • LS ID - The Link State ID identifies the piece of the routing domain that is being described by the advertisement. 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 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. Possible values are: - Q - This enables support for QoS Traffic Engineering. - E - This describes the way AS-external-LSAs are flooded. - MC - This describes the way IP multicast datagrams are forwarded according to the standard specifications. - O - This describes whether Opaque-LSAs are supported. - V - This describes whether OSPF++ extensions for VPN/COS are supported. Displaying the OSPF Link State Database Using CLI Commands For information about the CLI command that performs this function, see the following chapter in the CLI Reference Guide: • OSPF Commands The following table summarizes the equivalent CLI commands for this feature. Table 9-14. OSPF Link State Database Commands CLI Command show ip ospf database show ip ospf database database-summary Description Displays information about the link state database when OSPF is enabled. Displays the number of each type of LSA in the database for each area and for the router. 538 Configuring Routing