Controlling Route Distribution And Reception; Configuring Bgp Route Summarization - HP FlexFabric 12900E Series Configuration Manual

Step
1. Enter system view.
2. Enter
address
BGP-VPN
address family view.
3. Enable route redistribution
from the specified IGP into
BGP.
4. (Optional.) Enable default
route redistribution into BGP.

Controlling route distribution and reception

This section describes how to control route distribution and reception.

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. To ensure
correct packet forwarding, change the priority of the summary or specific route to make the specific
route 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 unicast/multicast address family):
BGP IPv6 unicast
family view or
IPv6 unicast
Command
system-view
•
Enter BGP IPv6
address family view:
a. bgp as-number
[
instance-name
[ multi-session-thread ]
b. address-family
[ unicast ]
•
Enter BGP-VPN IPv6 unicast
address family view:
c. bgp as-number
[
instance-name
[ multi-session-thread ]
d. ip vpn-instance
vpn-instance-name
e. address-family
[ unicast ]
import-route
[ { process-id | all-processes }
[ allow-direct | med med-value |
route-policy route-policy-name ]
* ]
default-route imported
224
Remarks
N/A
unicast
instance
]
ipv6
N/A
instance
]
ipv6
protocol
By default,
redistribute IGP routes.
By default,
redistribute default routes.
BGP does not
BGP does not