Redistributing Igp Routes; Controlling Route Distribution And Reception; Configuring Bgp Route Summarization - HPE FlexNetwork HSR6800 Configuration Manual

Redistributing IGP routes

Perform this task to configure route redistribution from an IGP to BGP.
By default, BGP does not redistribute default IGP routes. You can use the default-route imported
command to redistribute default IGP routes into the BGP routing table.
The origin attribute of BGP routes redistributed from IGPs is INCOMPLETE.
Only active routes can be redistributed. You can use the display ip routing-table protocol
command to view route state information. For more information about the display ip routing-table
protocol command, see Layer 3—IP Routing Command Reference.
To configure BGP to redistribute IGP routes:
Step
Enter system view.
1.
Enter BGP view or
2.
BGP-VPN instance view.
Enable route redistribution
3.
from IGP into BGP.
Enable default route
4.
redistribution into BGP.

Controlling route distribution and reception

Configuring BGP route summarization

To reduce the number of routes to be redistributed and the routing table size on medium and large
BGP networks, configure route summarization on BGP routers. BGP supports the following
summarization modes: automatic and manual. 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
Enter system view.
1.
Command
system-view
•
Enter BGP view:
bgp as-number
•
Enter BGP-VPN instance
view:
a. bgp as-number
b. ipv4-family
vpn-instance
vpn-instance-name
import-route protocol
[ { process-id | all-processes }
[ allow-direct | med med-value |
route-policy route-policy-name ]
* ]
default-route imported
Command
system-view
204
Remarks
N/A
Use either method.
Not enabled by default.
The allow-direct keyword is
available only when the specified
routing protocol is OSPF.
Not enabled by default.
Remarks
N/A