HP 6125G HP 6125G & 6125G/XG Blade Switches Layer 3 - IP Routing Confi - Page 149
Enabling BGP and IGP route synchronization, Limiting prefixes received from a peer or peer group
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Step 3. Configure BGP route reception filtering policies. Command Remarks • Filter incoming routes with an ACL or IP prefix list: filter-policy { acl-number | ip-prefix ip-prefix-name } import • Reference a routing policy to filter routes from a peer or peer group: peer { group-name | ip-address } route-policy route-policy-name import Configure at least one command. No route reception filtering is configured by default. • Reference an ACL to filter routing information from a peer or peer group: If several filtering policies are configured, they are applied in the following sequence: peer { group-name | ip-address } 4. filter-policy import filter-policy acl-number import 5. peer filter-policy import • Reference an AS path list to filter routing information from a peer or peer group: peer { group-name | ip-address } as-path-acl as-path-acl-number import 6. peer as-path-acl import 7. peer ip-prefix import 8. peer route-policy import Only routes passing all the configured policies can be received. • Reference an IP prefix list to filter routing information from a peer or peer group: peer { group-name | ip-address } ip-prefix ip-prefix-name import Enabling BGP and IGP route synchronization By default, upon receiving an IBGP route, a BGP router checks the route's next hop. If the next hop is reachable, the BGP router advertises the route to EBGP peers. If the synchronization feature is configured, in addition to the reachability check of the next hop, the BGP router must find an active IGP route with the same destination network segment before it can advertise the IBGP route (use the display ip routing-table protocol command to check the IGP route state). To enable BGP and IGP synchronization: Step 1. Enter system view. 2. Enter BGP view. 3. Enable synchronization between BGP and IGP. Command system-view bgp as-number synchronization Remarks N/A N/A Not enabled by default. Limiting prefixes received from a peer or peer group Step 1. Enter system view. 2. Enter BGP view. Command system-view bgp as-number Remarks N/A N/A 139