IS-IS Packet Fields (Alphabetical Order)

  • ATT— Attachment Bits (Flags attachment to other areas)

  • Checksum— Checksum of contents of LSP from source ID field to the end

  • Circuit Type— Defines whether link is Level-1 and Level-2

  • End LSP— LSP ID of last LSP in CSNP

  • Holding Time— Defines how long to wait for a hello from this system before clearing the adjacency

  • ID Length— Length of the System ID field in an NSAP(NET)

  • Intradomain Routing Protocol Discriminator— Network layer protocol identifier

  • IS Type— Defines type of router, Level-1 or Level-2

  • LAN ID— LAN Identifier, Consists of the System ID of the designated intermediate system plus a unique number

  • Length Indicator— Length of the fixed header of the packet in bytes

  • Local Circuit ID— Unique identifier for ...

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