Configuring Bgp Route Summarization - HP 6125XLG Configuration Manual

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.
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 ]
summary automatic
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 ]
183
Remarks
N/A
N/A
N/A
By default, automatic route
summarization is not configured.
Remarks
N/A
N/A
N/A