232
Step
Command
Remarks
2.
Enter BGP IPv6 unicast
address family view,
BGP-VPN IPv6 unicast
address family view, or BGP
IPv6 multicast address family
view.
•
Enter BGP IPv6 unicast
address family view:
a. bgp
as-number
[
instance
instance-name
]
b. address-family ipv6
[
unicast
]
•
Enter BGP-VPN IPv6 unicast
address family view:
c. bgp
as-number
[
instance
instance-name
]
d. ip vpn-instance
vpn-instance-name
e. address-family ipv6
[
unicast
]
•
Enter BGP IPv6 multicast
address family view:
f. bgp
as-number
[
instance
instance-name
]
g. address-family ipv6
multicast
N/A
3.
Enable route redistribution
from the specified IGP into
BGP.
import-route
protocol
[ {
process-id
|
all-processes
}
[
allow-direct
|
med
med-value
|
route-policy route-policy-name
]
* ]
By default, BGP does not
redistribute IGP routes.
4.
(Optional.) Enable default
route redistribution into BGP.
default-route imported
By default, BGP does not
redistribute default routes.
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):
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