ext-community-change enable

Function

The ext-community-change enable command enables a device to change extended community attributes based on a Route-Policy.

The undo ext-community-change enable command disables a device from changing extended community attributes based on a Route-Policy.

By default, extended community attributes cannot be changed based on a Route-Policy.

Product	Support
S5720-EI, S5720-HI, S5730-HI, S5731-H, S5731-S, S5731S-H, S5731S-S, S5732-H, S6720-EI, S6720-HI, S6720S-EI, S6730-H, S6730S-H, S6730-S, and S6730S-S	Supported
S2720-EI, S5720I-SI, S5720-LI, S5735-L, S5735S-L, S5735S-L-M, S5720S-LI, S5720S-SI, S5720-SI, S5735-S, S5735S-S, S5735-S-I, S5730S-EI, S5730-SI, S6720-LI, S6720S-LI, S6720S-SI, and S6720-SI	Not supported

Format

ext-community-change enable

undo ext-community-change enable

Parameters

None

Views

BGP view, BGP-IPv4 unicast address family view, BGP-IPv4 multicast address family view, BGP-VPN instance IPv4 address family view, BGP-IPv6 unicast address family view, BGP-VPN instance IPv6 address family view

Default Level

2: Configuration level

Usage Guidelines

Usage Scenario

By default, BGP prevents a device from changing extended community attributes from a peer or peer group based on an import policy or changing extended community attributes to be advertised to a peer or peer group based on an export policy. To enable a device to change extended community attributes from a peer or peer group based on an import policy and change extended community attributes to be advertised to a peer or peer group based on an export policy before advertising them, run the ext-community-change enable command.

Precautions

The ext-community-change enable and peer route-policy import commands must both be run so that the device can change extended community attributes from a peer or peer group based on an import policy.
The ext-community-change enable command must be run with either of the following commands so that the extended community attributes changed based on an export policy can be advertised to a peer or peer group.
- peer advertise-ext-community
- peer route-policy export

Example

# Enable the device to change extended community attributes of the BGP routes received from peer 10.1.1.1 based on a Route-Policy named policy1.

<HUAWEI> system-view

[HUAWEI] route-policy policy1 permit node 10

[HUAWEI-route-policy] if-match as-path-filter 2

[HUAWEI-route-policy] apply extcommunity rt 10.1.1.1:1 additive

[HUAWEI-route-policy] quit

[HUAWEI] bgp 100

[HUAWEI-bgp] ipv4-family unicast

[HUAWEI-bgp-af-ipv4] ext-community-change enable

[HUAWEI-bgp-af-ipv4] peer 10.1.1.1 route-policy policy1 import