HP 6125G HP 6125G & 6125G/XG Blade Switches Layer 3 - IP Routing Confi - Page 146

Controlling route distribution and reception Configuration prerequisites BGP connections must be created. Configuring BGP route summarization To reduce the routing table size on medium and large BGP networks, you need to configure route summarization on BGP routers. BGP supports automatic and manual summarization modes. Manual summary routes have a higher priority than automatic ones. Configuring automatic route summarization After automatic route summarization is configured, BGP summarizes redistributed IGP subnets to advertise only natural networks. Routes injected with the network command cannot be summarized. To configure automatic route summarization: Step 1. Enter system view. 2. Enter BGP view. 3. Configure automatic route summarization. Command system-view bgp as-number summary automatic Remarks N/A N/A Not configured by default. Configuring manual route summarization By configuring manual route summarization, you can summarize both redistributed routes and routes injected using the network command and determine the mask length for a summary route as needed. To configure BGP manual route summarization: Step 1. Enter system view. 2. Enter BGP view. Command system-view bgp as-number Remarks N/A N/A 3. Configure manual route summarization. aggregate ip-address { mask | mask-length } [ as-set | attribute-policy route-policy-name | detail-suppressed | origin-policy route-policy-name | suppress-policy route-policy-name ]* Not configured by default. Advertising a default route to a peer or peer group After this task is configured, the BGP router sends a default route with the next hop being itself to the specified peer or peer group. This action is taken regardless of whether the default route is available in the routing table. 136