HP 6125XLG R2306-HP 6125XLG Blade Switch Layer 3 - IP Routing Configuration Gu - Page 194
Configuring BGP route summarization
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Configuring BGP route summarization Route summarization can reduce the number of redistributed routes and the routing table size. IPv4 BGP supports automatic route summarization and manual route summarization. Manual summarization takes precedence over automatic summarization. IPv6 BGP supports only manual route summarization. The output interface of a BGP summary route is Null 0 on the originating router. Therefore, a summary route must not be an optimal route on the originating router. Otherwise, BGP will fail to forward packets matching the route. If a summarized specific route has the same mask as the summary route, but has a lower priority, the summary route becomes the optimal route. In this case, you must change the priority of the summary or the specific route to make the specific route as the optimal route. Configuring automatic route summarization Automatic route summarization enables BGP to summarize IGP subnet routes redistributed by the import-route command so BGP advertises only natural network routes. To configure automatic route summarization (IPv4): Step 1. Enter system view. 2. Enter BGP view or BGP-VPN instance view. 3. Enter BGP IPv4 unicast instance view or BGP-VPN IPv4 unicast instance view. 4. Configure automatic route summarization. Command system-view • Enter BGP view: bgp as-number • Enter BGP-VPN instance view: a. bgp as-number b. ip vpn-instance vpn-instance-name ipv4-family [ unicast ] summary automatic Remarks N/A N/A N/A By default, automatic route summarization is not configured. 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 (IPv4): Step 1. Enter system view. 2. Enter BGP view or BGP-VPN instance view. 3. Enter BGP IPv4 unicast instance view or BGP-VPN IPv4 unicast instance view. Command system-view • Enter BGP view: bgp as-number • Enter BGP-VPN instance view: a. bgp as-number b. ip vpn-instance vpn-instance-name ipv4-family [ unicast ] Remarks N/A N/A N/A 183