Area address Area address(es) of source node Intermediate system neighbors Neighboring routers and pseudonodes (appended to the link-state packet) End system neighbors Connected workstations Partition designated level 2 intermediate Level 2 neighbors that interconnect pieces of a partitioned system area with a virtual link over the Level 2 area Prefix neighbors Reachable NSAP prefixes (not including local area prefixes) Intermediate system neighbors LAN-connected routers from which IS-IS hello packets have been received (appended to LAN hello) Not specified Padding Padding for hello packets to maximum transmission unit (MTU) LSP entries Link-state information Authentication information Information for IS-IS packet authentication Convergent Network Management and Control Plane TABLE 8.3 List of the TLVs Introduced by IETF in RFC 1195 Description IP internal reachability information Intradomain IS-IS routes Protocols supported Protocol identifiers of supported network layer protocols (e.g., IP and CLNP) IP external reachability information Routes external to the IS-IS domain, such as those imported from other sources via redistribution Interdomain routing protocol information For transparent distribution of interdomain routes IP interface address IP address of the outgoing interface Authentication information IS-IS packet authentication (similar to Type 10, but doesn't define authentication Type 255) The subnetwork-dependent functions involve operations for detecting, forming, and maintaining routing adjacencies with neighboring routing entities over various types of interconnecting network links. The subnetwork-independent functions provide the capa- bilities for exchange and processing of routing information and related control informa- tion between adjacent routers as validated by the subnetwork-dependent functions. The routing information base is composed of two databases that are central to the opera- tion of IS-IS: the link-state database and the forwarding database. The link-state data- base is fed with rout