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Type
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The OSPF interface type. By way of a default, this field may be intuited from the corresponding value of ifType. Broadcast LANs, such as Ethernet and IEEE 802.5, take the value broadcast; X.25 and similar technologies take the value nbma; and links that are definitively point-to-point take the value pointToPoint.
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Lsid
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The Link State ID is an LS type-specific field containing either a router ID or an IP address. It identifies the piece of the routing domain that is being described by the advertisement.
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RouterId
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A 32-bit integer uniquely identifying the router in the autonomous system.
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Sequence
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The sequence number is a signed 32-bit integer that identifies old and duplicate link state advertisements.
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Age
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The age in seconds of the link state advertisement.
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Checksum
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This field is the checksum of the complete contents of the advertisement, excepting the age field. The age field is excepted so that an advertisement's age can be incremented without updating the checksum. The checksum used is the same that is used for ISO connectionless datagrams. It is commonly referred to as the Fletcher checksum.
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Advertisement
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Hex representation of the entire link state advertisement, including the header.
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