7.20.5 Example for Configuring the BGP Community Attribute
Networking Requirements
As shown in Figure 7-8, Switch B creates EBGP connections with Switch A and Switch C. You
can configure the No_Export community attribute on Switch A. Thus, the routes advertised from
AS 10 to AS 20 are not advertised to other ASs.
Figure 7-8 Networking diagram for configuring the BGP community
XGE0/0/1
9.1.1.1/24
XGE0/0/2
200.1.2.1/24
SwitchA
AS 10
XGE0/0/2
200.1.2.2/24
SwitchB
AS 20
XGE0/0/3
200.1.3.2/24
SwitchC
AS 30
XGE0/0/3
200.1.3.1/24
EBGP
EBGP
Switch Interface VLANIF interface IP address
SwitchA XGigabitEthernet0/0/1 VLANIF 10 9.1.1.1/24
SwitchA XGigabitEthernet0/0/2 VLANIF 20 200.1.2.1/24
SwitchB XGigabitEthernet0/0/2 VLANIF 20 200.1.2.2/24
SwitchB XGigabitEthernet0/0/3 VLANIF 30 200.1.3.1/24
SwitchC XGigabitEthernet0/0/3 VLANIF 30 200.1.3.2/24
Configuration Roadmap
The configuration roadmap is as follows:
1. Configure the EBGP connections between Switch A and Switch B, and between Switch B
and Switch C.
2. Configure the routing policy on Switch A, and advertise No_Export community attribute.
Data Preparation
To complete the configuration, you need the following data:
l The router ID of Switch A is 1.1.1.1 and its AS number is 10.
l The router ID of Switch B is 2.2.2.2 and its AS number is 20.
S6700 Series Ethernet Switches
Configuration Guide - IP Routing 7 BGP Configuration
Issue 01 (2012-03-15) Huawei Proprietary and Confidential
Copyright © Huawei Technologies Co., Ltd.
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