Accton Technology ES4710BD manual Spanning-tree max-hop, Spanning-tree mcheck

ES4710BD 10 Slots L2/L3/L4 Chassis Switch

Bridge_Max_Age >= 2 ×(Bridge_Hello_Time + 1.0 seconds)

Example: Setting the maximum age time to 25 seconds in Global Mode.

Switch(Config)#spanning-tree maxage 25

10.2.2.11spanning-tree max-hop

Command: spanning-tree max-hop <hop-count>no spanning-tree max-hop

Function: Sets the maximum hops allowed for connecting to the port; the “no spanning-treemax-hop” command restores the default settings.

Parameters: < hop-count>is the max hop count, the valid range is 1 to 40.

Command mode: Global Mode

Default: The default maximum is 20 hops.

Usage Guide: MSTP not only keeps Max-age for BPDU lifecycle, but a Max-hop added to the MSTP field standing for BPDU lifecycle. The max-hop count decreases when packets transmit through the network. A BPDU message reaches its max Max-hop upon leaving the root bridge of MSTI, each time BPDU is received, the Max-hop value decrements by 1. When a port receives a BPDU with Max-hop 0, it will drop that BPDU and make itself the designated port for sending BDPUs.

Example: Setting the max-hop count to 32. Switch(Config)#spanning-tree max-hop 32

10.2.2.12spanning-tree mcheck

Command: spanning-tree mcheck

Function: Forces port migration to run under MSTP.

Command mode: Port configuration Mode

Default: Ports are operating under MSTP by default.

Usage Guide: If bridges running IEEE 802.1D STP exist in the segment connected to the current Ethernet port, this port will migrate to the STP compatible mode. When the network is fairly stable, even if the bridge running STP is disconnected, the associated port running MSTP will continue running in STP compatible mode, and this command can be used to force the port to migrate to MSTP mode. When the port migrates to MSTP, it will switch back to STP compatible mode on receiving news STP packets,

This command can only be executed when the switch is running in IEEE 802.1s MSTP mode, and will be invalid if the switch is configured in IEEE 802.1D STP mode.

Example: Forcing port 1/2 migrate MSTP mode. Switch(Config-Ethernet1/2)#spanning-tree mcheck

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