peer capability-advertise add-path (BGP multi-instance VPNv4 address family view) (group)

Function

The peer capability-advertise add-path command enables BGP Add-Path function.

The undo peer capability-advertise add-path command restores the default setting.

By default, the Add-Path function is disabled.

Format

peer group-name capability-advertise add-path { both | receive | send }

undo peer group-name capability-advertise add-path { both | receive | send }

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.
add-path	Indicates the Add-Path function. add-path takes effect only on IBGP peers.	-
both	Enables the RR to receive Add-Path routes from and send Add-Path routes to a specified IBGP peer.	-
receive	Enables the RR to receive Add-Path routes from a specified IBGP peer.	-
send	Enables the RR to send Add-Path routes to a specified IBGP peer.	-

Views

BGP multi-instance VPNv4 address family 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.

Precautions

If a peer is specified when the peer capability-advertise add-path command is run, a peer group is specified when the peer advertise best-external command is run, and then the peer is added to the peer group, the peer cannot inherit the configuration of the peer advertise best-external command from the peer group.

Example

# Enable the device to receive Add-Path routes from and send Add-Path routes to a specified IBGP peer group.

<HUAWEI> system-view
[~HUAWEI] bgp 100 instance p1
[~HUAWEI-bgp-instance-p1] group a internal
[~HUAWEI-bgp-instance-p1] ipv4-family vpnv4
[~HUAWEI-bgp-instance-p1-af-vpnv4] peer a enable
[~HUAWEI-bgp-instance-p1-af-vpnv4] peer a capability-advertise add-path both