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State POINT_TO_POINT
The state of the OSPF neighbor.
Timer intervals...
The various timer intervals configured for the link.
P1R-294
show ip ospf virtual-links
show ip ospf virtual-links
OSPF Commands
Syntax Description
Command Modes
Command History
Release
Modification
Usage Guidelines
Examples
Field
Description
Network Protocols Command Reference, Part 1
Table 200
show ip ospf virtual-links Field Descriptions (continued)
Hello due in 0:00:08
When the next hello is expected from the neighbor.
Adjacency State FULL
The adjacency state between the neighbors.
P1R-295
show ip ospf virtual-links
Field
Description
OSPF Commands
Network Protocols Command Reference, Part 1
Use the summary-address command in router configuration mode to create aggregate addresses for
OSPF. The no summary-address command restores the default.
summary-address address mask {level-1 | level-1-2 | level-2} prefix mask [not-advertise]
[tag tag]
no summary-address address mask {level-1 | level-1-2 | level-2}
address
Summary address designated for a range of addresses.
mask
IP subnet mask used for the summary route.
level-1
Only routes redistributed into Level 1 are summarized
with the configured address/mask value. This keyword
applies to IS-IS only.
level-1-2
The summary router is injected into both a Level 1 area
and a Level 2 subdomain. This keyword applies to IS-IS
only.
level-2
Routes learned by Level 1 routing will be summarized
into the Level 2 backbone with the configured
address/mask value. This keyword applies to IS-IS only.
prefix
IP route prefix for the destination.
mask
IP subnet mask used for the summary route.
not-advertise
(Optional) Used to suppress routes that match the
prefix/mask pair. This keyword applies to OSPF only.
tag tag
(Optional) Tag value that can be used as a “match” value
for controlling redistribution via route maps. This
keyword applies to OSPF only.
This command is disabled by default.
Router configuration
10.0
This command was introduced.
Multiple groups of addresses can be summarized for a given level. Routes learned from other routing
protocols can also be summarized. The metric used to advertise the summary is the smallest metric of
all the more specific routes. This command helps reduce the size of the routing table.
P1R-296
summary-address (OSPF)
summary-address (OSPF)
OSPF Commands
Syntax Description
Defaults
Command Modes
Command History
Release
Modification
Usage Guidelines
Network Protocols Command Reference, Part 1
Using this command for OSPF causes an OSPF autonomous system boundary router (ASBR) to
advertise one external route as an aggregate for all redistributed routes that are covered by the address.
For OSPF, this command summarizes only routes from other routing protocols that are being
redistributed into OSPF. Use the area range command for route summarization between OSPF areas.
In the following example, summary address 10.1.0.0 includes address 10.1.1.0, 10.1.2.0, 10.1.3.0, and
so forth. Only the address 10.1.0.0 is advertised in an external link state advertisement.
summary-address 10.1.0.0 255.255.0.0
area range
Consolidates and summarizes routes at an area boundary.
ip ospf authentication
Assigns a password to be used by neighboring routers that are using
the simple password authentication of OSPF.
ip ospf message-digest-key
Enables OSPF MD5 authentication.
P1R-297
Description
summary-address (OSPF)
Examples
Related Commands
Command
OSPF Commands
Network Protocols Command Reference, Part 1
To change the interval at which OSPF LSAs are collected into a group and refreshed, checksummed, or
aged, use the timers lsa-group-pacing command in router configuration mode. To restore the default
value, use the no form of this command.
timers lsa-group-pacing seconds
no timers lsa-group-pacing
seconds
Number of seconds in the interval at which LSAs are grouped and
refreshed, checksummed, or aged. The range is 10 seconds to
1800 seconds. The default value is 240 seconds.
This command is disabled by default.
Router configuration
11.3 AA
This command was introduced.
OSPF LSA group pacing is enabled by default. For typical customers, the default group pacing interval
for refreshing, checksumming, and aging is appropriate and you need not configure this feature.
The duration of the LSA group pacing is inversely proportional to the number of LSAs the router is
handling. For example, if you have approximately 10,000 LSAs, decreasing the pacing interval would
benefit you. If you have a very small database (40 to 100 LSAs), increasing the pacing interval to 10 to
20 minutes might benefit you slightly.
The following example changes the OSPF pacing between LSA groups to 60 seconds:
router ospf
timers lsa-group-pacing 60
P1R-298
OSPF Commands
timers lsa-group-pacing
timers lsa-group-pacing
Syntax Description
Defaults
Command Modes
Command History
Release
Modification
Usage Guidelines
Examples
Network Protocols Command Reference, Part 1
To configure the delay time between when OSPF receives a topology change and when it starts a
shortest path first (SPF) calculation, and the hold time between two consecutive SPF calculations, use
the timers spf command in router configuration mode. To return to the default timer values, use the no
form of this command.
timers spf spf-delay spf-holdtime
no timers spf spf-delay spf-holdtime
spf-delay
Delay time, in seconds, between when OSPF receives a
topology change and when it starts a SPF. calculation. It can
be an integer from 0 to 65535. The default time is 5 seconds.
A value of 0 means that there is no delay; that is, the SPF
calculation is started immediately.
spf-holdtime
Minimum time, in seconds, between two consecutive SPF
calculations. It can be an integer from 0 to 65535. The default
time is 10 seconds. A value of 0 means that there is no delay;
that is, two consecutive SPF calculations can be done one
immediately after the other.
This command is disabled by default.
Router configuration
10.3
This command was introduced.
Setting the delay and hold time low causes routing to switch to the alternate path more quickly in the
event of a failure. However, it consumes more CPU processing time.
The following example changes the delay to 10 seconds and the hold time to 20 seconds:
timers spf 10 20
P1R-299
OSPF Commands
timers spf
timers spf
Syntax Description
Defaults
Command Modes
Command History
Release
Modification
Usage Guidelines
Examples
Network Protocols Command Reference, Part 1
P1R-300
timers spf
Network Protocols Command Reference, Part 1
OSPF Commands
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