supernet unicast advertise

Function

The supernet unicast advertise enable command configures a BGP device to advertise BGP supernet unicast routes to its peers.

The undo supernet unicast advertise enable or supernet unicast advertise disable command restores the default configuration.

By default, BGP supernet unicast routes are considered invalid and cannot be advertised to BGP peers or delivered to the IP routing table.

Format

supernet unicast advertise enable

supernet unicast advertise disable

undo supernet unicast advertise enable

Parameters

None

Views

BGP view, BGP-IPv4 unicast address family view, BGP-VPN instance IPv4 address family view, BGP-IPv6 unicast address family view, or BGP-VPN instance IPv6 address family view

Default Level

2: Configuration level

Usage Guidelines

Usage Scenario

A BGP supernet route has the same destination address and next-hop address or has a more detailed destination address than the next-hop address. Any route that meets one of the following conditions is a BGP supernet route.

If you perform bitwise AND operations on the destination address mask with the destination address and next-hop address, respectively, the calculated network addresses are the same, and the destination address mask is greater than or equal to the next-hop address mask.
If you perform bitwise AND operations on the destination address mask with the destination address and next-hop address, respectively, the calculated network addresses are different. However, if you perform bitwise AND operations on the next-hop address mask with the destination address and next-hop address, respectively, the calculated network addresses are the same.

For example, the route destined for 10.6.6.6 in the following command output is a BGP supernet route.

<HUAWEI> display bgp routing-table

 BGP Local router ID is 10.1.1.2
 Status codes: * - valid, > - best, d - damped,
               h - history,  i - internal, s - suppressed, S - Stale
               Origin : i - IGP, e - EGP, ? - incomplete

 Total Number of Routes: 1
        Network            NextHop        MED        LocPrf    PrefVal Path/Ogn
   *>i  10.6.6.6/32        10.6.6.6       0          100       0       ?

BGP supernet routes include BGP supernet labeled routes and BGP supernet unicast routes. To allow a Huawei device to advertise BGP supernet unicast routes that it receives from a connected non-Huawei device to its BGP peers, run the supernet unicast advertise enable command on the Huawei device.

Example

# Configure a BGP device to advertise BGP supernet unicast routes to its peers.

<HUAWEI> system-view

[HUAWEI] bgp 100

[HUAWEI-bgp] ipv4-family unicast

[HUAWEI-bgp-af-ipv4] supernet unicast advertise enable