43-4
Cisco ASDM User Guide
OL-16647-01
Chapter 43 Monitoring Routing
Monitoring OSPF LSAs
Sequence #—Display only. Displays the link state sequence number. The link state sequence number
is used to detect old or duplicate LSAs.
Checksum—Display only. Displays the checksum of the contents of the LSA.
Modes
The following table shows the modes in which this feature is available:
Type 5
Type 5 LSAs are passed between and flooded into areas by ABSRs. Th ey descr ibe rout es exte rnal to t he
AS. Stub areas and NSSAs do not receive these LSAs.
Fields
Process—Display only. Displays the OSPF process for the LSA.
Network—Display only. Displays the address of the AS external network.
Advertiser—Display only. Displays the router ID of the ASBR.
Age—Display only. Displays the age of the link state.
Sequence #—Display only. Displays the link state sequence number. The link state sequence number
is used to detect old or duplicate LSAs.
Checksum—Display only. Displays the checksum of the contents of the LSA.
Tag—Display only. Displays the external route tag, a 32-bit field attached to each external route.
This is not used by the OSPF protocol itself.
Modes
The following table shows the modes in which this feature is available:
Type 7
Type 7 LSAs are NSSA AS-external routes that are flooded by the ASBR. They are similar to Type 5
LSAs, but unlike Type 5 LSAs, which are flooded into multiple areas, Type 7 LSAs are only flooded into
NSSAs. Type 7 LSAs are converted to Type 5 LSAs by ABRs before being flooded into the area
backbone.
Firewall Mode Security Context
Routed Transparent Single
Multiple
Context System
——
Firewall Mode Security Context
Routed Transparent Single
Multiple
Context System
——