3Com 4007R Implementation Guide - Page 476
Network Link State Advertisements, If Link Type is Stub
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476 CHAPTER 19: OPEN SHORTEST PATH FIRST (OSPF) ROUTING s Link ID - Identifies the object to which this router link connects for each Link Type. Possible values: s If Link Type is PTP, then this is the neighboring router's router ID. s If Link Type is Transit, then this is the address of the designated router. s If Link Type is Stub, then this is the IP network or subnetwork number. s If Link Type is Virtual Link, then this is the neighboring router's router ID. s Link Data - Provides additional link information. Possible values: s If Link Type is PTP, then this is the MIB II index value for an unnumbered point-to-point interface. s If Link Type is Transit, then this is the IP address of the advertising router's interface. s If Link Type is Stub, then this is the network's IP address mask. s If Link Type is Virtual Link, then this is the IP address mask of the neighboring router. s Metric - Cost of using this outbound router link. With the exception of stub networks, this value must be other than 0. Network Link State Advertisements The designated router for each area originates a network link state advertisement for each transit network - a network that has more than one attached router. This advertisement describes all routers that are attached to the network, including the designated router itself. Each network link state advertisement (LSA) includes this information: s LSID (Link State ID) - The ID of the router that generated the LSA. s Router ID - ID of the router that originated the LSA. s LS Seq (Link State Sequence) - The sequence number of the advertisement. Used to detect old or duplicate link state advertisements. s LS age - The time, in seconds, since the LSA was generated. s Network Mask - IP address mask for the network. s Attached Routers - List of routers that are fully adjacent to the designated router (DR). The ID of the DR is also listed here.
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