HP VPN Firewall Appliances Network Management Configuration Guide

489
Ste
p
Command Remarks
2. Enter BGP view or BGP-VPN
instance view.
• Enter BGP view:
bgp as-number
• Enter BGP-VPN instance view:
a. bgp as-number
b. ipv4-family vpn-instance
vpn-instance-name
Use either method.
3. Specify a preferred value for
routes received from a peer or
peer group.
peer { group-name | ip-address }
preferred-value value
Optional.
By default, the preferred value is 0.
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:
Ste
p
Command Remarks
1. Enter system view.
system-view N/A
2. Enter BGP view or
BGP-VPN instance
view.
• Enter BGP view:
bgp as-number
• Enter BGP-VPN instance view:
a. bgp as-number
b. ipv4-family vpn-instance
vpn-instance-name
Use either method.
3. Configure preferences
for external, internal,
local BGP routes.
preference { external-preference
internal-preference local-preference |
route-policy route-policy-name }
Optional.
The default preferences of external,
internal, and local BGP routes are
255, 255, and 130, respectively.
4. Increase the
preference of a
received EBGP route.
network ip-address [ mask | mask-length ]
short-cut
Optional.
By default, an EBGP route received
has a preference of 255.
Configure the default local preference
The local preference is used to determine the best route for traffic leaving the local AS. When a BGP
router obtains from several IBGP peers multiple routes to the same destination but with different next hops,
it considers the route with the highest local preference as the best route.
This task allows you to specify the default local preference for routes sent to IBGP peers.
To specify the default local preference: