peer capability-advertise (BGP view) (group)

Function

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.

Format

peer group-name capability-advertise { conventional | route-refresh | 4-byte-as }

undo peer group-name capability-advertise { conventional | route-refresh | 4-byte-as }

Parameters

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.
conventional	Indicates the regular function. conventional takes effect only in the BGP view or BGP-VPN instance IPv4 address family view. If conventional is specified, the device does not support all extended functions, such as route-refresh, GR, multi-address family negotiation, and Add-Path.	-
route-refresh	Indicates the route-refresh function.	-
4-byte-as	Indicates the 4-byte AS number function.	-

Views

BGP view

Default Level

2: Configuration level

Task Name and Operations

Task Name	Operations
bgp	write

Usage Guidelines

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.

Example

# Configure a BGP device to advertise the route-refresh capability to its peer group.

<HUAWEI> system-view
[~HUAWEI] bgp 100
[*HUAWEI-bgp] group test external
[*HUAWEI-bgp] peer test as-number 200
[*HUAWEI-bgp] peer test capability-advertise route-refresh