259To do… Use the command… RemarksStep 3 Filter incoming routeswith an ACL or IP prefixlistfilter-policy { acl-number | ip-prefix ip-prefix-name } importRequiredUse one of the commands.No route reception filtering isconfigured by default.You can configure a filtering policyas needed.If several filtering policies areconfigured, they are applied in thefollowing sequence:1. filter-policy import2. peer filter-policy import3. peer as-path-acl import4. peer ip-prefix import5. peer route-policyimportOnly routes passing the first policycan go to the next; only routespassing all the configured policiescan be received.Step 4 Reference a routingpolicy to filter routesfrom a peer or peergrouppeer { group-name | ip-address} route-policy policy-nameimportStep 5 Reference an ACL tofilter routing informationfrom a peer or peergrouppeer { group-name | ip-address} filter-policy acl-numberimportStep 6 Reference an AS pathACL to filter routinginformation from a peeror peer grouppeer { group-name | ip-address} as-path-acl as-path-acl-number importStep 7 Reference an IP prefixlist to filter routinginformation from a peeror peer grouppeer { group-name | ip-address} ip-prefix ip-prefix-nameimportStep 8 Specify the number ofprefixes that can bereceived from a peer orpeer grouppeer { group-name | ip-address} route-limit prefix-number [ {alert-only | reconnectreconnect-time } | percentage-value ] *The number is not limited bydefault.• Only routes permitted by the specified filtering policies can be installed into the local BGP routing table.• Members of a peer group can have different route reception filtering policies from the peer group.Enabling BGP and IGP route synchronizationBy default, when a BGP router receives an iBGP route, it only checks the reachability of theroute’s next hop before advertisement. With BGP and IGP synchronization configured, the BGProuter cannot advertise the route to eBGP peers unless the route is also available in the IGProuting table.To do… Use the command… RemarksStep 1 Enter system view system-view —Step 2 Enter BGP view bgp as-number —
