Configuring area ranges on an ABR to reduce advertisements to the backbone
You can configure area ranges to reduce inter-area advertisements by summarizing a range of IP addresses into a single route advertisement. This action prevents an ABR from advertising specific networks or subnets to the backbone area.
Prerequisites
你必须在路由器configuration context, as indicated by theswitch(config-router)#prompt.
Procedure
Summarize inter-area or NSSA paths using the following command. For command details, see
区域range.
区域
For example, use the following command to summarize routes matching the area range 172.77.114.0/24 using inter-area as the type of address aggregation.
switch(config-ospf-1)#区域1 range 172.77.114.0/24 type inter-area
In another example, use the following command to specify DoNotAdvertise status for routes matching the area range 172.77.114.0/24. Use nssa as the type of address aggregation.
switch(config-ospf-1)#区域1 range 172.77.114.0/24 type nssa no-advertise