Loop Detection Interval; Loop Protection Actions - HP 6125XLG Configuration Manual

Figure 36 Inner frame header for loop detection
The inner frame header for loop detection contains the following fields:
Code—Protocol sub-type, which is 0x0001, indicating the loop detection protocol.
•
• Version—Protocol version, which is always 0x0000.
Length—Length of the frame. The value includes the inner header, but excludes the Ethernet header.
•
Reserved—This field is reserved.
•
Frames for loop detection are encapsulated as TLV triplets.
Table 10 TLVs supported by loop detection
TLV
End of PDU
Device ID
Port ID
Port Name
System Name
Chassis ID
Slot ID
Sub Slot ID
Loop detection uses the following important concepts.

Loop detection interval

Loop detection is a continuous process as the network changes. Loop detection frames are sent at a
specified interval (called a "loop detection interval") to check whether loops occur on ports and whether
loops are removed.

Loop protection actions

When the switch detects a loop on a port, it generates a log but performs no action on the port by default.
You can configure the switch to take one of the following actions:
Block—Disables the port from learning MAC addresses and blocks inbound traffic to the port.
•
• No-learning—Disables the port from learning MAC addresses.
Shutdown—Shuts down the port to disable it from receiving and sending any frames. The switch
•
automatically brings up the port after the detection timer expires. You can use the
shutdown-interval command to set the detection timer. For more information, see Fundamentals
Command Reference.
Description
End of a PDU.
Bridge MAC address of the sending device.
ID of the PDU sending port.
Name of the PDU sending port.
Device name.
Chassis ID of the sending port.
Slot ID of the sending port.
Sub-slot ID of the sending port.
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Remarks
Optional.
Required.
Optional.
Optional.
Optional.
Optional.
Optional.
Optional.