D-Link xStack DES-6500 User Manual page 169

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.
Field
Type
Link ID
Link Data
No. of TOS
TOS 0 Metric
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
TOS
Metric
xStack DES-6500 Modular Layer 3 Chassis Ethernet Switch User Manual
Description
A quick classification of the router link. One of the following: Type
Description Point-to-point connection to another router. Connection to a
transit network. Connection to a stub network. Virtual link.
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
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.
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.
The cost of using this router link for TOS 0.
Description
IP Type of Service that this metric refers to.
The cost of using this outbound router link, for traffic of the
specified TOS.
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