The leased 20 M bandwidth of a site is used as the upstream egress channel of the NE20. Since July 2007, the bandwidth is occupied. Users cannot open webpages or can open webpages too slow. The client users the MA5200 as bandwidth access device and performs rate-limit on the MA5200. The MA5200 connects the NE20. The NE20 is enabled with NA. Upgrade the NE20 from VRP 3.3 to VRP 5.3; enable NAT BT rate-limit in VRP 5.3; singly set nat car-bt cir 100; and configure nat flow-control 2000 car-bt.
The bandwidth is not lowered, and the connections are not reduced. It indicates that BT rate-limit is invalid.
1. Configure nat car-bt cir 100.
2. Configure nat car-class 1 512.
3. Configure nat connection-class 1 50.
4. Enable nat flow-control 2001 connection-number 1car-source-ip 1 car-bt.
Here, the traffic-limit is 50 Kbps. You should adjust the value according to the client's requirements. If the number of connections is too small, users cannot open multiple webpages. If the number of connections is too large, rate-limit does not take effect.
If only NAT BT rate-limit is used, sessions of each user cannot be reduced. If you want to reduce session connections during the user of NAT BT rate-limit, use NAT traffic-limit and NAT rate-limit together. NAT traffic-limit can reduce session connections of BT users. NAT rate-limit can be used to transfer bandwidth allocation from the MA5200 to the NE20 and reduce the incoming traffic of the leased bandwidth.
For the NE20 security manual, BT rate-limit can be implemented with proper configuration only. If you just configure BT rate-limit, the function is invalid. The NE20 cannot reduce PPP connections and control BT traffic within 100 Kbps according to BT rate-limit configuration.