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How to configure BGP (Border Gateway Protocol) with single ISP and advertise your public network

Description

This article shows you how to configure BGP with single ISP and advertise your public network

Resolution

In this scenario, we configure basic BGP between SonicWall and ISP's router using CLI(Command Line Interface) to advertise our network (with public IP address) to the ISP. It is necessary to have the AS(Autonomous System) numbers and public IP address of both devices. This information should be provided by ISP

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By default, BGP is disabled on SonicWall. To configure BGP follow the steps:

Step 1: Enable Advanced Routing

Network | Routing | Routing Mode : Advanced Routing


Step 2: Enable BGP(Configure with CLI)

Network | Routing | BGP : Enable(Configure with CLI)

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Note: If you don't see BGP option, you might need a license. Please refer to the following link for more information regarding BGP licensing:


 Step 3: Connect to SonicWall using port 22(SSH)

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 Step 4: Configure BGP

User:admin

Password:

admin@C0EAE45C0360> configure  / Enter to the configure mode
admin at GUI from 10.60.2.102 is editing.
Do you wish to preempt them (yes/no)?
[no]: yes / Confirm preemption from GUI user who has logged in to SonicWall
config(C0EAE45C0360)# routing  / Enter to Routing Module
(config-routing)# bgp / Enter to BGP module
ZebOS version 7.7.0 IPIRouter 7/2009
ARS BGP>
ARS BGP>configure terminal / Enter configure mode
ARS BGP(config)>router bgp 6501 / Set up AS number on SonicWall
ARS BGP(config-router)>neighbor 2.2.2.1 remote-as 6500 / Configure neighbor connection
ARS BGP(config-router)>network 20.20.20.0 mask 255.255.255.0  / Advertise your network
ARS BGP(config-router)>Ctrl+Z
ARS BGP>Write / To write the changes into memory
ARS BGP>Exit

config(C0EAE45C0360)#commit / To save the configuration

Step 5: Check BGP neighbor status

ARS BGP>show ip bgp summary
If the output of the command shows any number under State/PfcRcd, it indicates that the neighbors can communicate with each other.
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Step 6: Check the network advertised to the neighbor
ARS BGP>show ip bgp neighbors advertised-routes

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