R21xx-HP FlexFabric 11900 Layer 3 IP Routing Command Reference

263
Parameters
ip-address: Specifies an IPv4 network address. If the mask or mask-length is not specified, natural mask
is used.
mask: Specifies a mask of the network address in dotted decimal notation.
mask-length: Specifies a mask length in the range of 0 to 32.
ipv6-address: Specifies an IPv6 network address.
prefix-length: Specifies a prefix length in the range of 0 to 128.
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.
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 the same destination, the device does not select the EBGP route. You can use the
network shortcut command to configure the EBGP route to have the same preference as the local route
so the EBGP route is more likely to become the optimal route.
You can use the preference command to modify the preferences for external and local BGP routes.
Examples
# In BGP IPv4 unicast address family view, increase the preference of EBGP route 10.0.0.0/16.
<Sysname> system-view
[Sysname] bgp 100
[Sysname-bgp] ipv4-family unicast
[Sysname-bgp-ipv4] network 10.0.0.0 255.255.0.0 short-cut
# In BGP-VPN IPv6 unicast address family view, increase the preference of EBGP route 10::/16.
<Sysname> system-view
[Sysname] bgp 100
[Sysname-bgp] ip vpn-instance vpn1
[Sysname-bgp-vpn1] ipv6-family unicast
[Sysname-bgp-ipv6-vpn1] network 10:: 16 short-cut
Related commands
preference
peer advertise-community
Use peer advertise-community to advertise the COMMUNITY attribute to a peer or peer group.
Use undo peer advertise-community to disable the COMMUNITY attribute advertisement to a peer or
peer group.
Syntax
In BGP IPv4 unicast address family view/BGP-VPN IPv4 unicast address family view/BGP VPNv4
address family view:
peer { group-name | ip-address } advertise-community
undo peer { group-name } advertise-community
In BGP IPv6 unicast address family view: