Configuring Preferences For Bgp Routes - HP VSR1000 Configuration Manual

Step
3. Specify a preferred
value for routes received
from a peer or peer
group.

Configuring preferences for BGP routes

Routing protocols each have a default preference. If they find multiple routes destined for the same
network, the route found by the routing protocol with the highest preference is selected as the optimal
route.
You can use the preference command to modify preferences for EBGP, IBGP, and local BGP routes, or
reference a routing policy to set a preference for matching routes (for routes not matching the routing
policy, the default preference applies).
If a device has an EBGP route and a local BGP route to reach the same destination, it does not select the
EBGP route because the EBGP route has a lower preference than the local BGP route by default. You can
use the network short-cut command to configure the EBGP route as a shortcut route that has the same
preference as the local BGP route so that the EBGP route will more likely become the optimal route.
To configure preferences for BGP routes (IPv4 unicast/multicast address family):
Step
1. Enter system view.
2. Enter BGP IPv4 unicast
address family view,
BGP-VPN IPv4 unicast
address family view, or
BGP IPv4 multicast
address family view.
3. Configure preferences
for EBGP, IBGP, and
local BGP routes.
4. Configure an EBGP
route as a shortcut
route.
To configure preferences for BGP routes (IPv6 unicast/multicast address family):
Step
1. Enter system view.
Command
peer { group-name | ipv6-address }
preferred-value value
Command
system-view
•
Enter BGP IPv4 unicast address family
view:
a. bgp as-number
b. address-family ipv4 [ unicast ]
•
Enter BGP-VPN IPv4 unicast address
family view:
a. bgp as-number
b. ip vpn-instance vpn-instance-name
c. address-family ipv4 [ unicast ]
•
Enter BGP IPv4 multicast address family
view:
a. bgp as-number
b. address-family ipv4 multicast
preference { external-preference
internal-preference local-preference |
route-policy route-policy-name }
network ip-address [ mask | mask-length ]
short-cut
Command
system-view
224
Remarks
The default preferred value is 0.
Remarks
N/A
N/A
The default preferences for
EBGP, IBGP, and local BGP
routes are 255, 255, and 130.
By default, an EBGP route has a
preference of 255.
Remarks
N/A