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Configuring Passive
Interfaces
Init – Have received Hello packet, but communications not yet established
■
Two-way – Bidirectional communications established
■
ExStart – Initializing adjacency between neighbors
■
Exchange – Database descriptions being exchanged
■
Loading – LSA databases being exchanged
■
Full – Neighboring routers now fully adjacent
■
Identification flags include:
D – Dynamic neighbor
■
S – Static neighbor
■
DR – Designated router
■
BDR – Backup designated router
■
◆
Address – IP address of this interface.
◆
Interface – A Layer 3 interface on which OSPF has been enabled.
Web Interface
To display information about neighboring routers stored in the link state database:
1.
Click Routing Protocol, OSPF, Information.
2.
Click Neighbor.
3.
Select the process identifier.
Figure 293: Displaying Neighbor Routers Stored in the Link State Database
Use the Routing Protocol > OSPF > Passive Interface pages to configure or display
information about interfaces on which OSPF routing traffic is suppressed.
Command Usage
◆
You can configure an OSPF interface as passive to prevent OSPF routing traffic
from exiting or entering that interface. No OSPF adjacency can be formed if one
of the interfaces involved is set to passive mode. The specified interface will
appear as a stub in the OSPF domain. Also, if you configure an OSPF interface as
Configuring the Open Shortest Path First Protocol (Version 2)
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Chapter 18
| Unicast Routing
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