H3C Technologies H3C SecBlade IPS Cards - Manual (Page 78)

9-1
9
Layer 2 Fallback
Layer 2 Fallback Overview
The internal monitoring module of the device monitors the health status of the device periodically in a
high frequency. As long as detecting a detection engine or software system fault, or a large traffic, the
device can automatically fall back to be a simple Layer 2 switching device. In this way, the device does
not detect any network traffic, which ensures the continuity of network services. This function is called
Layer 2 fallback.
You can also manually enable or disable Layer 2 fallback.
Configuring Layer 2 Fallback
Select System Management > High Reliability > Layer 2 Fallback to enter the page for configuring
Layer 2 fallback, as shown in Figure 9-1 .
Figure 9-1 Layer 2 fallback
Table 9-1 describes the configuration items of setting Layer 2 fallback.
Table 9-1 Configuration items for Layer 2 fallback
Item Remarks
Layer 2
Fallback
z If the device is in the automatic detection status, the status indicator is green, and the
button at the right of the indicator is Enable. When the device detects a fault or a large
traffic, it automatically enables Layer 2 fallback. You can also click Enable to manually
make the device fall back to be a Layer 2 device.
z If the device is enabled with the Layer 2 fallback function, the status indicator is red, and
the button at the right of the indicator is Disable. After waiting for a period of time, the
device automatically disables Layer 2 fallback and enters the automatic detection status.
You can also click Disable to manually disable Layer 2 fallback.
Action for Data
Packets
Set how the device processes the data packets received when Layer 2 fallback is performed.
z Permit: The device does not check the data packets received and forwards them directly.
z Block: The device discards the data packets received so that the traffic can be blocked.
After the configuration, click Apply to make the configuration take effect.
By default, the device permits the data packets received.
Current
Networking
Mode
Display the current networking mode of the device as Directly connected or Bypassed.