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xStack DES-3800 Series Layer 3 Stackable Fast Ethernet Managed Switch
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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.
Field
Description
Link ID
Identifies the object that this router link connects to. Value depends on the
link’s Type. When connecting to an object that also originates a link state
advertisement (i.e. another router or a transit network) the Link ID is equal to
the neighboring advertisement’s Link State ID. This provides the key for
looking up an advertisement in the link state database. Type Link ID
Neighboring router’s Router ID. IP address of Designated Router. IP
network/subnet number. Neighboring router’s Router ID
Link Data
Contents again depend on the link’s Type field. For connections to stub
networks, it specifies the network’s IP address mask. For unnumbered point-
to-point connection, it specifies the interface’s MIB-II ifIndex value. For other
link types it specifies the router’s associated IP interface address. This latter
piece of information is needed during the routing table build process, when
calculating the IP address of the next hop.
No. of TOS
The number of different Type of Service (TOS) metrics given for this link, not
counting the required metric for TOS 0. If no additional TOS metrics are
given, this field should be set to 0.
TOS 0 Metric
The cost of using this router link for TOS 0.
For each link, separate metrics may be specified for each Type of Service (TOS). The metric for TOS 0 must always be included,
and was discussed above. Metrics for non-zero TOS are described below. Note that the cost for non-zero TOS values that are not
specified defaults to the TOS 0 cost. Metrics must be listed in order of increasing TOS encoding. For example, the metric for TOS
16 must always follow the metric for TOS 8 when both are specified.
Field Description
TOS
IP Type of Service that this metric refers to.
Metric
The cost of using this outbound router link, for traffic of the specified TOS.