ERL and Layer Two processing
- 
 Look at the issue we have seen with using the ERL as a VPN end point, is it possible that the router can only handle a short number of VPN connects? What would be the maximum number of L2TP connections that the ERL can handle before throwing connection failures. Tagging: 
- 
 Short number? 
- 
 You would probably see issues with memory and CPU if the ERL is reaching its maximum. Do you have the ability to monitor that? 
- 
 @coliver said: You would probably see issues with memory and CPU if the ERL is reaching its maximum. Do you have the ability to monitor that? Yes, this should be a capacity issue, not a connection number limit. 
- 
 VPN connections use almost no resources, not on their own. But one busy VPN handling a lot of traffic can use all resources on its own. VPN connection count is a licensing concern on some devices, but not a technological concern. 
- 
 Do VPN connections get created/torn down with every communication? Or are they persistent until the device disconnects? 
- 
 @coliver said: Do VPN connections get created/torn down with every communication? Or are they persistent until the device disconnects? Normally neither. They are normally persistent until a certain amount of time, then they tear down when idle. Might be hours or days. That way they don't remain absolutely forever, but normally a very long time. 


