D-Link DGS-3620-28TC-SI Product Manual - Page 187

xStack® DGS-3620 Series Managed Switch Web UI Reference Guide Routers Links Advertisements Link-State Age Options Link-State Type Link-State ID Advertising Router Link-State Sequence Number Link-State Checksum Length Reserved V E B Reserved Link ID Number of Links Link Data Type No. Of TOS TOS 0 Metric TOS 0 ... Metric TOS 0 ... Metric Link ID Link Data Figure 5-28 Routers Links Advertisements In router links advertisements, the Link State ID field is set to the router's OSPF Router ID. The T-bit is set in the advertisement's Option field if and only if the router is able to calculate a separate set of routes for each IP Type of Service (TOS). Router links advertisements are flooded throughout a single area only. Parameter V-bit E-bit B-bit Number of Links Description When set, the router is an endpoint of an active virtual link that is using the described area as a Transit area (V is for Virtual link endpoint). When set, the router is an Autonomous System (AS) boundary router (E is for External). When set, the router is an area border router (B is for Border). The number of router links described by this advertisement. This must be the total collection of router links to the area. The following fields are used to describe each router link. Each router link is typed. The Type field indicates the kind of link being described. It may be a link to a transit network, to another router or to a stub network. The values of all the other fields describing a router link depend on the link's Type. For example, each link has an associated 32-bit data field. For links to stub networks, this field specifies the network's IP address mask. For other link types, the Link Data specifies the router's associated IP interface address. 177