H3C Technologies H3C SecPath F1000-E User Manual
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Figure 15 Router LSA format
...
0
# Links
Link ID
Link data
Type
TOS
Link ID
Link data
...
V
0
E B
#TOS
Metric
0
TOS metric
LS age
Linke state ID
Advertising router
Options
1
LS sequence number
LS checksum
Length
0
7
15
31
Major fields:
•
Link State ID: ID of the router that originated the LSA.
•
V (Virtual Link): Set to 1 if the router that originated the LSA is a virtual link endpoint.
•
E (External): Set to 1 if the router that originated the LSA is an ASBR.
•
B (Border): Set to 1 if the router that originated the LSA is an ABR.
•
# Links: Number of router links (interfaces) to the area, described in the LSA.
•
Link ID: Determined by Link type.
•
Link data: Determined by Link type.
•
Type: Link type. A value of 1 indicates a point-to-point link to a remote router; a value of 2 indicates
a link to a transit network; a value of 3 indicates a link to a stub network; a value of 4 indicates a
virtual link.
•
#TOS: Number of different TOS metrics given for this link.
•
Metric: Cost of using this router link.
•
TOS: IP Type of Service that this metric refers to.
•
TOS metric: TOS-specific metric information.
2.
Network LSA
A Network LSA is originated by the DR on a broadcast or NBMA network. The LSA describes all routers
attached to the network.