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OSPF (Characteristics (Metrics (Bandwidth), Hierarchical design (Area…
OSPF
Characteristics
Metrics
Bandwidth
Djikstra Shortest Path
VLSM
Hierarchical design
Area-based
Link-state
Packets
Hello (1)
Say hello!
Database Description (2)
What LSA lack and whatnot
Link-state Request (3)
Request LSA
Link-state Update (4)
Advertise LSA
Link-State Acknowledgment (5)
Confirm LSA
Router Types
Backbone
Within backbone
Internal
OSPF router
Area Border Router
Within multiple areas
Autonomous System Border Router
Within other routing protocol domains
Areas
Stub
Single exit point
No external routing
No LSA 5
No ASBR
Totally Stub
No LSA 3, 5
No ASBR
Not-So-Stubby
No LSA 5
Totally NSSA
No LSA 3, 5
SPF
Metric
Reference / Bandwidth
Reference can be changed
Reference 100Mbps
Overload
65535 metric
Don't use this route
Used for maintenance
Databases
Link-state
Candidate
Tree
Run per area basis
LSA
Types
Network (2)
Sent by DR
Header
Network mask
Attached router
Summary (3)
Another area information from ABR
Summary ASBR (4)
ASBR Location
AS External (5)
Describe route external to OSPF
Multicast OSPF (6)
NSSA (7)
LSA 5 for NSSA
External (8)
Opaque (9...)
Router (1)
Individual links and status
Optional Bits
0x4 (v) virtual link
0x2 (e) external
0x1 (b) border
Headers
LS Age
2 bytes
Time when LSA first originated
Options
1 byte
Indicate support for OSPF options
LS Type
1 byte
LSA type
LS ID
4 bytes
Describe various options
Advertising Router
4 bytes
Router ID of that generate LSA
LS Sequence
4 bytes
Verify most recent version
LS Checksum
2 bytes
Data integrity
Length
2 bytes
Length of LSA
Including header
Neighborship
Requirements
Area ID
Authentication
Timers
Area Flag
MTU size
State
Down
No hellos
Init
Hellos sent, 2 way com not yet initialized
2-Way
DR/BDR election
ExStart
Share link state information
Exchange
Exchanging DBD
Loading
Finally exchanging DBD
Full
DBD fully synced
Commands
Junos
# edit protocol ospf area [area id]
interface [interface | ip]
passive
priority
interface-type
metric
authentication ...
{stub | nssa}
no-summaries
default-metric
default-lsa
> show ospf
interface
neighbor
route
statistic
database
