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CCNP Routing and Switching ROUTE 300-101: Official Cert Guide by Kevin Wallace

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Clearing BGP Neighbors

As noted in Example 14-10 and the related explanations, Cisco IOS does not cause a newly configured BGP filter to take effect until the neighbor relationship is cleared. The neighborship can be cleared in several ways, including reloading the router and by administratively disabling and reenabling the BGP neighborship using the neighbor shutdown and no neighbor shutdown configuration commands. However, Cisco IOS supports several options on the clear ip bgp EXEC command for the specific purpose of resetting BGP connections. This section examines the differences in these options.

Each variation on the clear ip bgp... command either performs a hard reset or soft reset of one or more BGP neighborships. When a hard reset occurs, ...

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