Monitor==>OSPF Links

To view a summary of the OSPF database with one line per link state advertisement (LSA), click Monitor==>OSPF Links.
PortMaster  IP address or name of the selected PortMaster. 
Area  Contiguous set of routers shared on this network segment. 
Type  Type of OSPF link:
Router provides more detail for router links.
Network provides more detail for network links.
Summary provides more detail for summary links.
External provides more detail for external links.
nssa provides more detail for NSSA external links. 
Link ID  For Router links, the value that identifies the router address.
For Network links, the value that identifies the designated router address.
For Summary and External links, the value that identifies the network address advertised by the route that those links represent. 
Advertising Router  OSPF router ID of the router that originated the link state advertisement. 
Sequence  Link state sequence number used to detect old and duplicate link state advertisements (LSAs). Typically, the larger the sequence number, the newer the advertisement. When a router is rebooted, it might receive its old advertisements that are still known to other routers. If so, the router then brings its neighbors up-to-date by flooding the network with a new advertisement that has a sequence number larger than the number used in the old LSAs. 
TOS  Type of service:
YES This router supports TOS.
NO This router does not support TOS. 

Currently, only the TOS 0 metric is supported. 

For more information on TOS-based routing, see RFC 1349 and RFC 2328. 

External  Indicates if the external advertisements are to be flooded into the area. 
Age  Age of the LSA links in seconds. Links age out in 1 hour (3600 seconds), unless they are refreshed with a new (larger) sequence number. 
Mask  Netmask for the link ID.