Service Manual

Field Description
Link State ID Displays the Link State ID.
Advertising Router Identifies the router ID of the LSA’s originating router.
LS Seq Number Identifies the link state sequence number. This number enables
you to identify old or duplicate LSAs.
Checksum Displays the Fletcher checksum of the LSA’s complete contents.
Length Displays the length in bytes of the LSA.
Network Mask Displays the network mask implemented on the area.
Metrics Type Displays the external type.
TOS Displays the Type of Service (TOS) options. Option 0 is the only
option.
Metric Displays the LSA metric.
Forward Address Identifies the address of the forwarding router. Data traffic is
forwarded to this router. If the forwarding address is 0.0.0.0,
data traffic is forwarded to the originating router.
External Route
Tag
Displays the 32-bit field attached to each external route. The
OSPF protocol does not use this field, but you can use the field
for external route management.
Example
Dell# show ip ospf 1 database external
OSPF Router with ID (20.20.20.5) (Process ID 1)
Type-5 AS External
LS age: 612
Options: (No TOS-capability, No DC, E)
LS type: Type-5 AS External
Link State ID: 12.12.12.2
Advertising Router: 20.31.3.1
LS Seq Number: 0x80000007
Checksum: 0x4cde
Length: 36
Network Mask: /32
Metrics Type: 2
TOS: 0
Metrics: 25
Forward Address: 0.0.0.0
External Route Tag: 43
LS age: 1868
Options: (No TOS-capability, DC)
LS type: Type-5 AS External
Link State ID: 24.216.12.0
Advertising Router: 20.20.20.8
LS Seq Number: 0x80000005
Checksum: 0xa00e
Length: 36
Network Mask: /24
Metrics Type: 2
TOS: 0
Open Shortest Path First (OSPFv2 and OSPFv3) 1400