28.7.13 Route switching at 50 milliseconds [SL-L3A]

If all of the conditions listed in the following table are satisfied, the Switch can perform route switching for frames forwarded at Layer 2 due to failure and failure recovery in 50 milliseconds. Note that all master nodes and transit nodes that build a ring network must satisfy these setting conditions. The following table describes the setting conditions required for switching routes in 50 milliseconds.

Table 28-7: Required settings for switching routes in 50 milliseconds

Configuration items	Condition for setting
Total length per 1 ring	100km or less
Number of nodes in one ring	Up to 100
Ring port line speed	1Gbit/s or higher
Interval for sending health check frames	5 ms
Fault monitoring time	18 ms
Number of rings per device	2
VLAN mapped per ring	2
Setting the configuration command mac-clear-mode	Specifies that all entries in MAC address table are to be cleared
Distribution pattern of routing table entries	Be in one of the following modes IPv4 mode IPv4/IPv6 mode IPv6 unicast priority mode

If any of the following conditions is met, route switching at 50 milliseconds is not applicable.

• The stack function is enabled.

• Fault or fault recovery detected by the multiple fault monitoring function

• Both ring ports of the master node are shared link network configurations.

• The ring port is configured with link aggregation.

• The error or error recovery occurred during clearing of MAC address table entry triggered by the following:

  • Another ring is in a fault or recovery process

  • Execution of the clear mac-address-table operation command

  • Switching communication routes by redundancy of other Layer 2 networks such as Spanning Tree Protocols

• A fault or fault recovery occurred immediately after a configuration change (such as adding a VLAN mapping) to the ring.

• This error occurred immediately after switchback due to disaster recovery.