D-Link DGS-3312SR Product Manual - Page 118
Link-State Advertisement Header, Link-State Advertisement Header - dgs 105
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DGS-3312SR Gigabit Layer 3 Switch 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- 14. Link-State Advertisement Header Field Link State Age Options Link State Type Link State ID Advertising Router Link State Sequence Number Link State Checksum Length Description The time is seconds since the link state advertisement was originated. The optional capabilities supported by the described portion of the routing domain. The type of the link state advertisement. Each link state type has a separate advertisement format. The link state type are as follows: Type Description 1 Router Links Network Links Summary Link (IP Network) Summary Link (ASBR) AS External Link 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. 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. Detects old or duplicate link state advertisements. Successive instances of a link state advertisement are given successive Link State Sequence numbers. The Fletcher checksum of the complete contents of the link state advertisement, including the link state advertisement header by excepting the Link State Age field. The length in bytes of the link state advertisement. This includes the 20-byte link state advertisement header. 105