supernet advertise (BGP-VPN instance IPv4 address family view)

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.

The supernet label-route advertise disable command disables a BGP device from advertising labeled BGP supernet routes.

The undo supernet label-route advertise disable or supernet label-route advertise enable command restores the default configuration.

By default, labeled BGP supernet routes can be preferentially selected and advertised. 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

supernet label-route advertise enable

supernet label-route advertise disable

undo supernet unicast advertise enable

undo supernet label-route advertise disable

Parameters

None

Views

BGP-VPN instance IPv4 address family view

Default Level

2: Configuration level

Task Name and Operations

Task Name	Operations
bgp	write

Usage Guidelines

Usage Scenario

A BGP supernet route has the same destination address and next hop address or has a destination address that is more detailed 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.
BGP supernet routes include labeled BGP supernet routes and unicast BGP supernet routes. Run the supernet label-route advertise disable command to disable the BGP device from advertising labeled BGP supernet 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

# Disable a BGP device from advertising labeled BGP supernet routes.

<HUAWEI> system-view
[~HUAWEI] ip vpn-instance vpn1
[*HUAWEI-vpn-instance-vpn1] ipv4-family
[*HUAWEI-vpn-instance-vpn1-af-ipv4] route-distinguisher 100:1
[*HUAWEI-vpn-instance-vpn1-af-ipv4] quit
[*HUAWEI-vpn-instance-vpn1] quit
[*HUAWEI] bgp 100
[*HUAWEI-bgp] ipv4-family vpn-instance vpn1
[*HUAWEI-bgp-vpn1] supernet label-route advertise disable

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

<HUAWEI> system-view
[~HUAWEI] ip vpn-instance vpn1
[*HUAWEI-vpn-instance-vpn1] ipv4-family
[*HUAWEI-vpn-instance-vpn1-af-ipv4] route-distinguisher 100:1
[*HUAWEI-vpn-instance-vpn1-af-ipv4] quit
[*HUAWEI-vpn-instance-vpn1] quit
[*HUAWEI] bgp 100
[*HUAWEI-bgp] ipv4-family vpn-instance vpn1
[*HUAWEI-bgp-vpn1] supernet unicast advertise enable