Preparing For Configurations; Default Configurations Of Loop Detection - Raisecom ISCOM2600G-HI (A) Series Configuration Manual

Raisecom
ISCOM2600G-HI (A) Series Configuration Guide
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Loop detection modes
The loop detection modes consist of port mode and VLAN mode:
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If the loop detection processing mode is Trap-only in the previous two modes, the
ISCOM2600G-HI series switch sends Trap only.
Loop restoration
After an interface is blocked or shut down, you can configure it, such as no automatic
restoration and automatic restoration after a specified period.
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2.9.2 Preparing for configurations

Scenario
On the network, hosts or Layer 2 devices connected to access devices may form a loop
intentionally or involuntarily. Enable loop detection on downlink interfaces on all access
devices to avoid the network congestion generated by unlimited copies of data traffic. Once a
loopback is detected on an interface, the interface will be blocked.
Prerequisite
Loopback interface, interface backup, STP, G.8032, and RRPS interfere with each other. We
do not recommend configuring two or more of them concurrently.

2.9.3 Default configurations of loop detection

Default configurations of loop detection are as below.
Block: block the interface and send Trap.
Trap-only: send Trap only.
Shutdown: shut down the interface and send Trap.
Port mode: when a loop occurs, the system blocks the interface and sends Trap in the
loopback processing mode of Block, or shuts down the physical interface and sends Trap
information in the loopback processing mode of shutdown.
VLAN mode: when a loop occurs,
In loopback processing mode of Block, when a loop occurs on one or more of
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VLANs to which the interface belongs, the system blocks the VLANs with loop and
leaves other VLANs to normally receive or send packets.
In loopback processing mode of shutdown, the system shuts down the physical
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interface and sends Trap information.
If an interface is configured as automatic restoration after a specified period, the system
will start loop detection after the period. If the loop disappears, the interface will be
restored. Otherwise, it will be kept in blocking or shutdown status.
If an interface is configured as no automatic restoration, in other words, the automatic
restoration time is infinite, it will not be automatically restored.
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