IS-IS Network Design Solutions (Networking Technology)

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 a link

LSP ID ” Identifier for router's LSP, consisting of the System ID of the router, fragment number, and a nonzero octet for pseudonode number in case of pseudonode LSP

Maximum Area Addresses ” Number of areas permitted

OL ” LSP overload bit (also represented as LSPDBOL)

P ” Partition repair bit

PDU Length ” Length of packet (PDU) in bytes

PDU Type ” Type of packet

Priority ” Priority for node for DIS arbitration

R ” See Reserved

Remaining Lifetime ” Remaining time for an LSP to expire

Reserved ” Unspecified fields, transmitted as 0s and ignored on receipt

Sequence Number ” Sequence number of LSP

Source ID ” Same as system identifier (SysID)

TLV Fields ” Type (or code), Length and Value fields, also known as variable-length fields

Version/Protocol ID Extension ” Of the IS-IS protocol (defined as 1)