Connectivity Guide

• Advertising Router — Identies the advertising router’s ID.
• LS Seq Number — Identies the LS sequence number. This identies old or duplicate LSAs.
• Checksum — Displays the Fletcher checksum of an LSA’s complete contents.
• Length — Displays the LSA length in bytes.
• Network Mask—Identies the network mask implemented on the area.
• TOS—Displays the ToS options. The only option available is zero.
• Metric—Displays the LSA metric.
Example
OS10# show ip ospf database nssa external
OSPF Router with ID (2.2.2.2) (Process ID 100)
NSSA External (Area 0.0.0.1)
LS age: 98
Options: (No TOS-Capability, No DC, No Type 7/5 translation)
LS type: NSSA External
Link State ID: 0.0.0.0
Advertising Router: 1.1.1.1
LS Seq Number: 0x80000001
Checksum: 0x430C
Length: 36
Network Mask: /0
Metric Type: 1
TOS: 0
Metric: 16777215
Forward Address: 0.0.0.0
External Route Tag: 0
LS age: 70
Options: (No TOS-Capability, No DC, No Type 7/5 translation)
LS type: NSSA External
Link State ID: 0.0.0.0
Advertising Router: 2.2.2.2
LS Seq Number: 0x80000001
Checksum: 0x2526
Length: 36
Network Mask: /0
Metric Type: 1
TOS: 0
Metric: 0
Forward Address: 0.0.0.0
External Route Tag: 0
LS age: 65
Options: (No TOS-Capability, No DC, No Type 7/5 translation)
LS type: NSSA External
Link State ID: 12.1.1.0
Advertising Router: 2.2.2.2
LS Seq Number: 0x80000001
Checksum: 0xBDEA
Length: 36
Network Mask: /24
Metric Type: 2
TOS: 0
Metric: 20
Forward Address: 0.0.0.0
External Route Tag: 0
LS age: 65
Options: (No TOS-Capability, No DC, No Type 7/5 translation)
LS type: NSSA External
Link State ID: 13.1.1.0
Advertising Router: 2.2.2.2
LS Seq Number: 0x80000001
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Layer 3