D-Link DGS-3620-52P-SI Product Manual - Page 186
Link-State Advertisement Header, Link State ID
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xStack® DGS-3620 Series Managed Switch Web UI Reference Guide Link-State Advertisement Header Link-State Age Options Link-State Type Link-State ID Advertising Router Link-State Sequence Number Link-State Checksum Length Figure 5-27 Link State Advertisement Header Parameter Description Link State Age The time is seconds since the link state advertisement was originated. Options The optional capabilities supported by the described portion of the routing domain. Link State Type The type of the link state advertisement. Each link state type has a separate advertisement format. The link state types are as follows: Router Links, Network Links, Summary Link (IP Network), Summary Link (ASBR), AS External Link. Link State ID This field identifies the portion of the internet environment that is being described by the advertisement. The contents of this field depend on the advertisement's Link State Type. Advertising Router The Router ID of the router that originated the Link State Advertisement. For example, in network links advertisements this field is set to the Router ID of the network's Designated Router. Link State Sequence Detects old or duplicate link state advertisements. Successive instances of a link state Number advertisement are given successive Link State Sequence numbers. Link State Checksum The Fletcher checksum of the complete contents of the link state advertisement, including the link state advertisement header by accepting the Link State Age field. Length The length in bytes of the link state advertisement. This includes the 20-byte link state advertisement header. Router Links Advertisements Router links advertisements are type 1 link state advertisements. Each router in an area originates a routers links advertisement. The advertisement describes the state and cost of the router's links to the area. All of the router's links to the area must be described in a single router links advertisement. The format of the Router Links Advertisement is shown below: 176