Since firmware version 1.3.1, Vigor3900, Vigor2960 and Vigor300B support Fast Route function. It allows routing between specified networks, such as LAN to VPN, LAN to LAN, VPN to VPN, to skip the checking by CPU and go to the fast route path directly. This function will reduce the loading of CPU and speed up the performance between the routing networks.
Take the scenario below as an example: Vigor3900 acts as a VPN server and many PPTP Tunnels are dialing in. It has an IPsec tunnel to head office also and helps to do routing between these PPTP tunnels and the IPsec tunnel so that the PPTP clients can reach the servers in head office. Some of the PPTP tunnels have lots of traffic to the head office, and we can enable Fast Route for these subnets.
We can use Fast Route while observing:
1. The CPU usage of the router is high (over 90%)
2. The router has many sessions or heavy traffic over routing networks
1. Go to VPN and Remote Access >> Connection Management page, sort the tunnels by TX or RX Byte, then we can find out the tunnels with lots of traffic.
2. Go to Routing >> Fast Route page, and click Add to create a Fast Route profile.
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