IP Routing Features
Configuring OSPF
OSPF Passive
OSPF sends link-state advertisements (LSAs) to all other routers in the same
Autonomous System (AS). To limit the flooding of LSAs throughout the AS
you can configure OSPF to be passive. OSPF does not run in the AS, but it
does advertise the interface as a stub link into OSPF. Routing updates are
accepted by a passive interface, but not sent out.
There is a limit of 512 total active and passive interfaces, but only a total of
128 can be active interfaces.
To configure a passive OSPF interface, enter this command in vlan context:
ProCurve(vlan-1)# ip ospf passive
Syntax: [no] ip ospf <ip-addr> passive
Configures passive OSPF for an Autonomous System.
The no option disables the passive option; the interface
becomes an active interface.
Default: Active
<ip-addr>: Optionally you can configure an IP address on the
VLAN
To display the OSPF passive information, enter the command shown in Figure
5-35:
ProCurve(vlan-1)# show ip ospf interface
OSPF Interface Status
IP Address
10.10.10.1
10.12.13.1
----------
Status Area ID
enabled 0.0.0.2
enabled 0.0.0.2
------ -------
State
down
wait
-----
Auth-type
none
none
---------
Cost
1
1
----
Priority
1
1
--------
Passive
Yes
No
-------
Figure 5-35. Example of the show ip ospf interface Command with Passive Configured on an Interface
You can display the OSPF passive information for a particular VLAN, as shown
in Figure 5-36.
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