Displaying the Link State Database 101
Displaying External
Network LSAs
This display shows the external network LSAs in the link state database.
Originating from AS boundary routers, they describe routes to
destinations external to the Autonomous System.
To display external network LSAs:
1 Enter the following at the top-level menu:
ip ospf linkStateData external
The following prompt is displayed:
Enter LSID [0.0.0.0]:
1 Enter the LSID.
Enter LSID mask [0.0.0.0]:
2 Enter the LSID mask.
Table 26 describes the fields in the link state database external display:
LS Seq Sequence number of the LSA (used to detect older duplicate
LSAs)
LS Age Time in seconds since LSA was originated
Network Mask ■ Type 3= destination network’s IP address mask
■ Type 4= this type is not used, must be 0
Metric Cost to reach the network
Table 25 Field Attributes for Link State Database Network Summary Display
Field Description
Table 26 Field Attributes for the Link State Database External Display
Field Description
LSID IP network number.
Router ID Originating router ID.
LS Seq Sequence number of the LSA (used to detect older duplicate
LSAs).
LS Age Time in seconds since LSA was originated.
Network Mask IP address mask for the advertised destination.
Fwd Address Forwarding address for data traffic to the advertised destination.
Metric Cost to reach advertised destination.
(continued)
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