peer advertise dependent-filter(BGP-VPN instance IPv6 address family view)(BGPUCASTVPNOM)

Function

The peer advertise dependent-filter command configures a conditional BGP route advertisement policy.

The undo peer advertise dependent-filter command cancels the configuration of a conditional BGP route advertisement policy.

By default, conditional advertisement is not enabled.

Format

peer groupName advertise dependent-filter dependent-filter-list outDependType [ condition-filter condition-filter-list ]

undo peer groupName advertise dependent-filter dependent-filter-list outDependType [ condition-filter condition-filter-list ]

undo peer groupName advertise dependent-filter

Parameters

Parameter	Description	Value
groupName	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.
dependent-filter dependent-filter-list	Specifies the name of a dependent route prefix list.	The value is a string of 1 to 63 case-sensitive characters. It cannot contain spaces.
outDependType	Specifies the matching type.	The value is an enumerated type, which can be: match-all: Match all active routes; match-one: Match one active route; match-none: Match all inactive routes.
condition-filter condition-filter-list	Specifies the name of the prefix list for conditional route advertisement.	The value is a string of 1 to 63 case-sensitive characters. It cannot contain spaces.

Views

BGP-VPN instance IPv6 address family view

Default Level

2: Configuration level

Task Name and Operations

Task Name	Operations
bgp	write

Usage Guidelines

Usage Scenario

Conditional advertisement provides additional control over BGP route advertisement. Before advertising routes, the system checks whether the specified dependent routes exist in the BGP routing table and determines whether to advertise BGP routes accordingly.

The condition-filter parameter is optional and is used to specify the routes for which conditional advertisement is enabled.

If condition-filter is specified, the system checks whether the route to be advertised exists in the condition-filter-list. If yes, the system checks dependent routes. Otherwise, the route is directly advertised.
If condition-filter is not specified, the system checks the dependent routes for all routes to be advertised by default.

The outDependType parameter specifies the dependency check type.

match-all: indicates that the route is advertised only when all the routes specified in the dependent-filter-list are active.
match-one: indicates that the route is advertised as long as there is an active route in the dependent filter list.
match-none: indicates that the route is advertised only when all routes in the dependent-filter-list are inactive.

Prerequisites

An IP prefix list has been created using the filter-list ipv6-prefix command.

Configuration Impact

If you run this command for the same peer, the latest configuration overwrites the previous one.

Example

# Enable the conditional advertisement policy for the route 2001:db8:2::/96 so that it is advertised when the 2001:db8:3::/96 and 2001:db8:4::/96 routes are active in the BGP routing table.

<HUAWEI> system-view
[~HUAWEI] ip vpn-instance vrf
[*HUAWEI-vpn-instance-vrf] ipv6-family
[*HUAWEI-vpn-instance-vrf-af-ipv6] quit
[*HUAWEI-vpn-instance-vrf] quit
[*HUAWEI] filter-list ipv6-prefix cond-list
[*HUAWEI-ipv6-prefix-list-cond-list] prefix 2001:db8:2:: 96
[*HUAWEI-ipv6-prefix-list-cond-list] quit
[*HUAWEI] filter-list ipv6-prefix depend-list
[*HUAWEI-ipv6-prefix-list-depend-list] prefix 2001:db8:3:: 96
[*HUAWEI-ipv6-prefix-list-depend-list] prefix 2001:db8:4:: 96
[*HUAWEI-ipv6-prefix-list-depend-list] quit
[*HUAWEI] bgp 100
[*HUAWEI-bgp] vpn-instance vrf
[*HUAWEI-bgp-instance-vrf] group grp
[*HUAWEI-bgp] ipv6-family vpn-instance vrf
[*HUAWEI-bgp-6-vrf] peer grp enable
[*HUAWEI-bgp-6-vrf] peer grp advertise dependent-filter depend-list match-all condition-filter cond-list