How can I configure BGP (Border Gateway Protocol) with single ISP and advertise your public network?
12/20/2019 
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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
By default, BGP is disabled on SonicWall. To configure BGP follow the steps:
Enable Advanced Routing
- Login to your SonicWall management page and click Manage tab on top of the page.
- Navigate to Network |Routing page, on right side go to Settings tab.
- Under Routing Mode, select Advanced Routing as below.
- Click OK button in the pop-up window as below. Click Accept button to save settings.
Enable BGP in SonicWall Management (Configure with CLI)
- Login to your SonicWall management page and click Manage tab on top of the page.
- Navigate to Network |Routing page, on right side go to Settings tab.
- Under Routing Mode: select Advanced Routing
- BGP: Enabled (Configure with CLI) (Select this option from Drop-down box).
- Click Accept.
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: UTM: Expanded license for A/A Clustering and BGP
Connect to SonicWall using port 22(SSH)
Configure BGP using CLI
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 / press in Keyboard
ARS BGP> Write / To write the changes into memory ARS BGP> Exit
config(C0EAE45C0360)# commit / To save the configuration
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.
Check the network advertised to the neighbor
- ARS BGP> show ip bgp neighbors advertised-routes.
Resolution for SonicOS 6.2 and Below
The below resolution is for customers using SonicOS 6.2 and earlier firmware. For firewalls that are generation 6 and newer we suggest to upgrade to the latest general release of SonicOS 6.5 firmware.
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.
By default, BGP is disabled on SonicWall. To configure BGP follow the steps:
Enable Advanced Routing
- Navigate to Network | Routing | Routing Mode , select Advanced Routing.
Enable BGP(Configure with CLI)
- Navigate to Network | Routing | BGP , select Enable(Configure with CLI).
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: UTM: Expanded license for A/A Clustering and BGP
Connect to SonicWall using port 22(SSH)
Configure BGP using CLI
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 / press in Keyboard
ARS BGP> Write / To write the changes into memory ARS BGP> Exit
config(C0EAE45C0360)# commit / To save the configuration
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.
Check the network advertised to the neighbor
- ARS BGP> show ip bgp neighbors advertised-routes
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