Route Filtering and Clearing BGP Peers
BGP allows the filtering of BGP Update messages on any BGP router. The router can filter updates per neighbor for both inbound and outbound Updates on any BGP router.
After adding a new BGP filter to a router’s configuration, the BGP neighbor relationships must be reset or cleared to cause the filter to take effect. The Cisco IOS BGP clear command tells the router specifically how to reset the neighborship. This section also examines the variations on the BGP clear command, including the more disruptive hard reset options and the less disruptive soft reset options.
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