# BGP Convergence Test (Link failure scenario)
**URL:** https://forum.networklessons.com/t/bgp-convergence-test-link-failure-scenario/43689
**Category:** BGP
**Created:** [February 23, 2024, 11:17am UTC](https://forum.networklessons.com/t/bgp-convergence-test-link-failure-scenario/43689 "2024-02-23T11:17:02Z")
**Posts on this page:** 2
**Page:** 1
### Author:  [@vnwk05](https://forum.networklessons.com/u/vnwk05)
#### Post date: [February 23, 2024, 11:17am UTC](https://forum.networklessons.com/t/bgp-convergence-test-link-failure-scenario/43689/1 "2024-02-23T11:17:02Z")
Hi All,
Need some help to Explain the BGP Convergence Test (Link Failure Scenario) with cisco xRV configuration.
My scenario is i have 3 routers and connected R1 to R2 and R1 to R3, If R1 to R2 link goes down the traffic has to go R1 to R3 Link. Please explain with BGP Configuration with Cisco xRV configuration.
Thanks,
Venkat.
---
### Author:  [@lagapidis](https://forum.networklessons.com/u/lagapidis)
#### Post date: [February 26, 2024, 6:17am UTC](https://forum.networklessons.com/t/bgp-convergence-test-link-failure-scenario/43689/2 "2024-02-26T06:17:16Z")
Hello Venkat
There are various methods and features that can be used to have BGP deliver failover capabilities. One of the simplest approaches, regardless of the Cisco platform you are using, is to do the following:
This simplified configuration assumes that each router is in a different AS.
For R1, the configuration would look something like this:
```auto
router bgp 100
bgp log-neighbor-changes
neighbor 10.0.0.2 remote-as 200
neighbor 10.0.0.3 remote-as 300
network 192.168.1.0
```
For R2:
```auto
router bgp 200
bgp log-neighbor-changes
neighbor 10.0.0.1 remote-as 100
network 192.168.2.0
```
And for R3:
router bgp 300
```auto
bgp log-neighbor-changes
neighbor 10.0.0.1 remote-as 100
network 192.168.3.0
```
In this example, the 192.168.x.0 network represents the networks behind each router. The 10.0.0.x addresses are the interfaces on the routers that connect them together.
When the link between R1 and R2 goes down, BGP will automatically re-converge and send the traffic to R3. This is because BGP will realize that the path to R2 is unavailable and will choose the next available path, which is through R3.
Keep in mind that this is a very simplified example and actual implementation may require additional configuration depending on your network setup. Additional mechanisms that are involved in such an approach include:
> **[BGP Multipath load sharing iBGP and eBGP](https://networklessons.com/bgp/bgp-multipath-load-sharing-ibgp-and-ebgp)**
>
> BGP supports ECMP (Equal Cost Multi-Path) routing but by default, it only uses a single path. Cisco IOS supports load balancing for eBGP and iBGP.
> **[BGP Additional Paths](https://networklessons.com/bgp/bgp-additional-paths)**
>
> BGP additional paths let your iBGP routers advertise multiple additional paths next to the best path. This allows you to use load balancing and multipath.
> **[BGP Next Hop Address Tracking](https://networklessons.com/bgp/bgp-next-hop-address-tracking)**
>
> BGP next-hop address tracking improves BGP convergence times.It detects events in the routing table and updates next hop info in the BGP table.
> **[Single/Dual Homed and Multi-homed Designs](https://networklessons.com/bgp/singledual-homed-and-multi-homed-designs)**
>
> This lesson explains the difference between single homed, dual homed, single multi-homed and dual multi-homed BGP connections to ISP(s).
Take a look at the above, and if you have further questions, let us know!
I hope this has been helpful!
Laz