ext-community-change enable (BGP-IPv4 multicast address family view)

Function

The ext-community-change enable command allows a routing policy to modify the VPN target extended community attribute, SoO extended community attribute, and link-bandwith attribute.

The undo ext-community-change enable command disables the VPN target extended community attribute, SoO extended community attribute, and link-bandwith attribute from being modified using a routing policy.

By default, a BGP device cannot use route-policies to change the VPN target extended community attribute, SoO extended community attribute, and link-bandwith attribute in matched BGP routes.

Format

ext-community-change enable

undo ext-community-change enable

Parameters

None

Views

BGP-IPv4 multicast address family view

Default Level

2: Configuration level

Task Name and Operations

Task Name	Operations
bgp	write

Usage Guidelines

Usage Scenario

By default, BGP prevents a device from using a route-policy to change the VPN target extended community attribute, SoO extended community attribute, and link-bandwith attribute in the matched routes either learned from or to be advertised to a peer or peer group. To enable a device to use route-policies to change the VPN target extended community attribute, SoO extended community attribute, and link-bandwith attribute in matched routes, run the ext-community-change enable command. After running this command, you can configure an import route-policy to change the VPN target extended community attribute, SoO extended community attribute, and link-bandwith attribute in the matched routes received from a peer or peer group. You can also configure an export route-policy to filter the optimal routes selected by BGP and then change the VPN target extended community attribute, SoO extended community attribute, and link-bandwith attribute in the matched routes that are to be advertised to the peer or peer group.

Precautions

By default, BGP prevents a device from using a route-policy to change the VPN-Target or SoO extended community attribute in the matched routes either learned from or to be advertised to a peer or peer group. To enable a device to use route-policies to change the extended community attributes in matched routes, run the ext-community-change enable command. After running this command, you can configure an import route-policy to change the extended community attributes in the matched routes received from a peer or peer group. You can also configure an export route-policy to filter the optimal routes selected by BGP and then change the extended community attributes in the matched routes that are to be advertised to the peer or peer group.

Example

# Enable the device to change extended community attributes based on a route-policy.

<HUAWEI> system-view
[~HUAWEI] bgp 100
[*HUAWEI-bgp] ipv4-family multicast
[*HUAWEI-bgp-af-multicast] ext-community-change enable