05-17-2020 05:11 PM
Hi Guys,
I wasn't able to summarize these:
192.168.1.0/25 is subnetted, 2 subnets
O 192.168.1.0/25 [110/2] via 192.168.3.130, 00:03:58, GigabitEthernet0/0
O 192.168.1.128/25 [110/2] via 192.168.3.130, 00:03:30, GigabitEthernet0/0
192.168.2.0/25 is subnetted, 2 subnets
O 192.168.2.0/25 [110/2] via 192.168.3.130, 00:03:45, GigabitEthernet0/0
O 192.168.2.128/25 [110/2] via 192.168.3.130, 00:03:30, GigabitEthernet0/0
This are my commands:
Switch(config-router)#area 0 range 192.168.1.0 255.255.255.128
Switch(config-router)#area 0 range 192.168.2.0 255.255.255.128
05-17-2020 06:00 PM
192.168.1.0/25 is equal to 192.168.1.0 255.255.255.128 so there is nothing to summarize , right?
255.255.255.128 is /25
try area 0 range 192.168.1.0 255.255.255.0 <<aka /24 it should show up as summarized now
Regards, ML
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05-18-2020 01:07 AM - edited 05-18-2020 01:08 AM
Hello @noeljr311 ,
@Martin L is correct in his answer to be able to summarize at area border on ABR, you need to use a /24 prefix length that is equivalent to a wild card mask of 255.255.255.0
In addition to this you need to have an OSPF multiarea to see it working: the effects of the command are visible in the OSPF database of all other areas different from area 0.
This is the true meaning of the command: the ABR in creating the LSA type 3 inter-area routes called unfortunately summary LSA will take in account the area range commands and will create summarized LSA type 3 that will be sent in areas different from the source area (the area where the route components exist as part of a LSA type 1 or as a LSA type 2).
Hope to help
Giuseppe
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