Configuring Preferences For Bgp Routes - HP MSR Series Configuration Manual

Among multiple routes that have the same destination/mask and are learned from different peers, the
one with the greatest preferred value is selected as the route to the destination.
To specify a preferred value for routes from a peer or peer group:
Step
1. Enter system view.
2. Enter BGP view or BGP-VPN
instance view.
3. Specify a preferred value for
routes received from a peer or
peer group.

Configuring preferences for BGP routes

A router might run multiple routing protocols with each having a preference. If they find the same route,
the route found by the routing protocol with the highest preference is selected.
You can use the preference command to modify preferences for external, internal, and local BGP routes.
By default, the preference of an EBGP route is lower than a local route. If a device has an EBGP route and
a local route to reach a destination, the device does not select the EBGP route. You can use the network
shortcut command to configure an EBGP route as a shortcut route that has the same preference as a local
route. The EBGP route is then more likely to become the optimal route.
To configure preferences for BGP routes:
Step
1. Enter system view.
2. Enter BGP view or BGP-VPN
instance view.
3. Configure preferences for
external, internal, local BGP
routes.
4. Increase the preference of a
received EBGP route.
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
peer { group-name | ip-address }
preferred-value value
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
preference { external-preference
internal-preference
local-preference | route-policy
route-policy-name }
network ip-address [ mask |
mask-length ] short-cut
193
Remarks
N/A
Use either method.
Optional.
By default, the preferred value is 0.
Remarks
N/A
Use either method.
Optional.
The default preferences of external,
internal, and local BGP routes are
255, 255, and 130, respectively.
Optional.
By default, an EBGP route received
has a preference of 255.