HP 5920 Series Command Reference Manual page 398

Default
The preferences of external, internal, and local BGP routes are 255, 255, and 130, respectively.
Views
BGP IPv4 unicast address family view, BGP-VPN IPv4 unicast address family view, BGP IPv6 unicast
address family view, BGP-VPN IPv6 unicast address family view
Predefined user roles
network-admin
Parameters
external-preference: Specifies a preference for EBGP routes, in the range of 1 to 255.
internal-preference: Specifies a preference for IBGP routes, in the range of 1 to 255.
local-preference: Specifies a preference for local routes, in the range of 1 to 255.
route-policy route-policy-name: Specifies a routing policy by its name, a case-sensitive string of 1 to 63
characters, to set the route preference for matching routes. Routes not matching the routing policy use the
default preference.
Usage guidelines
Different routing protocols might find different routes to the same destination. However, not all of those
routes are optimal. For route selection, routing protocols, direct routes, and static routes are assigned
different preferences. The route with the highest preference is preferred.
Configuring the preferences for BGP routes changes the possibility for the routes to become the optimal
route.
To reference a routing policy to set the preference, you must configure the preference with the apply
preference command in the routing policy in advance. Otherwise, all matching routes use the default
preference.
Examples
# In BGP IPv4 unicast address family view, configure preferences for EBGP, IBGP, and local routes as 20,
20, and 200, respectively.
<Sysname> system-view
[Sysname] bgp 100
[Sysname-bgp] address-family ipv4 unicast
[Sysname-bgp-ipv4] preference 20 20 200
# In BGP IPv4 unicast address family view, configure the preference for BGP route 1.1.1.0/24 as 200.
<Sysname> system-view
[Sysname] ip prefix-list route permit 1.1.1.0 24
[Sysname] route-policy prefer permit node 0
[Sysname-route-policy-prefer-0] if-match ip address prefix-list route
[Sysname-route-policy-prefer-0] apply preference 200
[Sysname-route-policy-prefer-0] quit
[Sysname] bgp 100
[Sysname-bgp] address-family ipv4 unicast
[Sysname-bgp-ipv4] preference route-policy prefer
# In BGP-VPN IPv6 unicast address family view, configure preferences for EBGP, IBGP, and local routes
as 20, 20, and 200, respectively.
<Sysname> system-view
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