Concept Guide

Usage Information To isolate problems with inter-area and external routes, use this command. In OSPF inter-area and external routes
are calculated by adding LSA cost to the cost of reaching the router. If an inter-area or external route is not of
correct cost, the display can determine if the path to the originating router is correct or not.
Example
Dell#show ip ospf 1 topology
Router ID Flags Cost Nexthop Interface Area
3.3.3.3 E/B/-/ 1 20.0.0.3 Te 0/6 0
1.1.1.1 E/-/-/ 1 10.0.0.1 Te 0/6 1
Dell#
summary-address
To advertise one external route, set the OSPF ASBR.
Syntax
summary-address ip-address mask [not-advertise] [tag tag-value]
To disable summary address, use the no summary-address ip-address mask command.
Parameters
ip-address Specify the IP address in dotted decimal format of the address to summarize.
mask Specify the mask in dotted decimal format of the address to summarize.
not-advertise (OPTIONAL) Enter the keywords not-advertise to suppress that match the network
prex/mask pair.
tag tag-value (OPTIONAL) Enter the keyword tag then a value to match on routes redistributed
through a route map. The range is from 0 to 4294967295.
Defaults Not congured.
Command Modes ROUTER OSPF
Supported Modes Full–Switch
Command History
Version Description
9.9(0.0) Introduced on the FN IOM.
8.3.16.1 Introduced on the MXL 10/40GbE Switch IO Module.
Usage Information
The area range command summarizes routes for the dierent areas.
With the not-advertise parameter congured, you can use this command to lter out some external routes.
For example, if you want to redistribute static routes to OSPF, but you don't want OSPF to advertise routes with
prex 1.1.0.0, you can congure the summary-address 1.1.0.0 255.255.0.0 not-advertise to lter out all the routes fall
in range 1.1.0.0/16.
Related Commands area range — summarizes routes within an area.
timers spf
Set the time interval between when the switch receives a topology change and starts a shortest path rst (SPF) calculation.
Syntax
timers spf delay holdtime msec
Open Shortest Path First (OSPFv2 and OSPFv3) 969