D-Link DES-3326SRM Product Manual - Page 183
Table 12. Summary Link Advertisement, Field, Description, Network Mask, Metric
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D-Link DES-3326S Layer 3 Switch Summary Link Advertisements Link-State Age Options 2 Link-State ID Advertising Router Link-State Sequence Number Link-State Checksum Length TOS Network Mask Metric For stub area, Type 3 summary link advertisements can also be used to describe a default route on a per-area basis. Default summary routes are used in stub area instead of flooding a complete set of external routes. When describing a default summary route, the advertisement's Link State ID is always set to the Default Destination − 0.0.0.0, and the Network Mask is set to 0.0.0.0. Separate costs may be advertised for each IP Type of Service. Note that the cost for TOS 0 must be included, and is always listed first. If the T-bit is reset in the advertisement's Option field, only a route for TOS 0 is described by the advertisement. Otherwise, routes for the other TOS values are also described. If a cost for a certain TOS is not included, its cost defaults to that specified for TOS 0. Table 12. Summary Link Advertisement Field Network Mask TOS Metric Description For Type 3 link state advertisements, this indicates the destination network's IP address mask. For example, when advertising the location of a class A network the value 0xff000000 The Type of Service that the following cost is relevant to. The cost of this route. Expressed in the same units as the interface costs in the router links advertisements. 173