The Effect of auto-summary on the BGP network Command
As of Cisco IOS Release 15.1 mainline, BGP defaults to a setting of no auto-summary, and the previous section’s discussion of the network command assumed this default setting. However, if the configuration is changed to auto-summary, Cisco IOS makes a small change in how it interprets the network command.
The change in logic occurs only when the network command omits its mask parameter; there is no difference in logic if the mask parameter is explicitly configured. When the network command refers to a Class A, B, or C network, with no mask parameter configured and with auto-summary configured, the router adds a route for that classful network to the BGP table under one of the following conditions: ...
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