The peer capability-advertise command enables optional BGP functions when a BGP peer advertises routes to its peer. The optional BGP functions include route-refresh, general function, 4-byte AS number, and Add-Path.
The undo peer capability-advertise command restores the default setting.
By default, the route-refresh and 4-byte AS number functions are enabled, but the general function and Add-Path are disabled.
| Parameter | Description | Value |
|---|---|---|
| group-name |
Specifies the name of a peer group. |
The name is a string of 1 to 47 case-sensitive characters, with spaces not supported. When double quotation marks are used around the string, spaces are allowed in the string. |
| route-refresh |
Indicates the route-refresh function. |
- |
| 4-byte-as |
Indicates the 4-byte AS number function. |
- |
Usage Scenario
There are multiple optional BGP functions when a BGP peer advertises routes to its peer. The optional BGP functions include route-refresh, general function, 4-byte AS number, and Add-Path. You can run the peer capability-advertise command to select one of the functions based on the needs on the live network.
Configuration Impact
If you enable or disable the route-refresh, general function, 4-byte AS number, or Add-Path function, the BGP peer relationship will be re-established, which can lead to a temporary network interruption. Therefore, exercise caution when running the related commands.
<HUAWEI> system-view [~HUAWEI] ip vpn-instance vpn1 [*HUAWEI-vpn-instance-vpn1] ipv6-family [*HUAWEI-vpn-instance-vpn1-af-ipv6] route-distinguisher 100:1 [*HUAWEI-vpn-instance-vpn1-af-ipv6] quit [*HUAWEI-vpn-instance-vpn1] quit [*HUAWEI] bgp 100 [*HUAWEI-bgp] ipv6-family vpn-instance vpn1 [*HUAWEI-bgp-6-vpn1] group test external [*HUAWEI-bgp-6-vpn1] peer test as-number 200 [*HUAWEI-bgp-6-vpn1] peer test capability-advertise route-refresh