The New Strange Behavior for OSPF ‘Redistribute Subnets’
In older IOS Code, there was a specific requirement for redistributing OSPF Subnets. In almost every case, the keyword “subnets” had to be added to the redistribute command.
Older Code Example–
//notice the warning when 'subnets' is omitted R1(config)#router ospf 1 R1(config-router)#redistribute eigrp 1 % Only classful networks will be redistributed //and the configuration is stored exactly as it was typed R1(config-router)#do show run | sec router router ospf 1 log-adjacency-changes redistribute eigrp 1 //we can change the behavior by adding 'subnets' R1(config-router)#redistribute eigrp 1 subnets //after adding, it is stored as one would expect R1(config-router)#do show run | sec router router ospf 1 log-adjacency-changes redistribute eigrp 1 subnets
When I tested this in VIRL running 15.6(1S) running inside of IOS XE 3.17, the warning goes away. The question I had is whether it is still relevant or not.
Current Code Example–
//without the 'subnets' keyword csr1000v-2(config)#router ospf 1 csr1000v-2(config-router)#redistribute eigrp 1 csr1000v-2(config-router)#do show run | sec router router ospf 1 redistribute eigrp 1 //with the 'subnets' keyword csr1000v-2(config-router)#redistribute eigrp 1 subnets csr1000v-2(config-router)#do show run | sec router router ospf 1 redistribute eigrp 1 subnets
I initially spent some time experimenting with this and thought that ‘subnets‘ had Continue reading
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