Netgear GSM7252PS ProSafe Managed Switch Web Management User Manual - Page 292

ProSafe® Gigabit L3 Managed Stackable Switches Software Administration Manual Table 35. Field Description 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. The options 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. Click REFRESH to show the latest OSPF Link State information. 292 | Chapter 4. Routing