Hello - there are 2 types of summaries in OSPF: 1. Between areas at the ABR. To do this you use the "area range" command within the routing process on the area border router. This advertises the summary into the specified area as a type 3 (OIA). This will also generate the discard route for the summary by default. 2. At the ASBR (generally when summarising routes external to the ospf domain) - this is done under the router ospf process using the "summary address" command. This route shows up as a type 5 (E2) by default with a cost of 20. This also generates the discard route by default.
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