user manual

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. They describe routes external to the
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
• — • ——