ELTEX MES3108 - 5.15.5 STP family (STP, RSTP, MSTP); 5.15.5.1 STP, RSTP configuration

94 MES3000 Ethernet switch series
Table 5.84 —EXEC mode commands
Command
Value
Action
show loopback-detection
[gigabitethernet gi_port |
tengigabitethernet te_port |
port-channel group]
gi_port: (1..8/0/1..24);
te_port: (1..8/0/1..4);
group: (1..24)
Show the state of loopback-detection mechanism.
5.15.5 STP family (STP, RSTP, MSTP)
The main task of STP (Spanning Tree Protocol) is to convert Ethernet network with multiple links
into tree-like loop-free topology. Switches exchange configuration messages, using the special format
frames, and selectively enable or disable traffic transmission to ports.
Rapid STP (RSTP) is the enhanced version of STP that enables faster network conversion to the tree-
like topology and provides higher stability.
Multiple STP (MSTP) is the most recent implementation of STP protocol, that support VLAN
utilization. Each instance may contain multiple VLAN groups. However, MSTP protocol has a drawback—all
MSTP-operating switches should have the same VLAN group configuration.
Multiprocess STP mechanism is designed for creation of independent STP/RSTP/MSTP trees on
device ports. State changes of a separate tree will not affect the state of other trees, that will allow to
increase the network stability and reduce the tree rebuild time in case of failures. During the
configuration, it is important to eliminate the possibility of loop formation for member ports of the
different trees. For isolated tree processing, the separate process is created for each tree in the system.
The process matches the device ports that belong to the tree.
5.15.5.1 STP, RSTP configuration
Global configuration mode commands
Command line request in global configuration mode appears as follows:
console(config)#
Table 5.85 —Global configuration mode commands
Command
Value/Default value
Action
spanning-tree
-
Enable STP utilization by the switch.
no spanning-tree
Disable STP utilization by the switch.
spanning-tree mode {stp |
rstp | mstp}
-/rstp
Set STP operation mode.
- stp—IEEE 802.1D Spanning Tree Protocol;
- rstp—IEEE 802.1W Rapid Spanning Tree Protocol;
- mstp—IEEE 802.1S Multiple Spanning Tree Protocol.
no spanning-tree mode
Restore the default value.
spanning-tree forward-time
seconds
seconds: (4..30)/15
seconds
Set the time interval for state listening and learning before
switching to the transfer mode.
no spanning-tree forward-time
Restore the default value.
spanning-tree hello-time
seconds
seconds: (1..10)/2
seconds
Set the interval for 'Hello' broadcast message transmission to
communicating switches.
no spanning-tree hello-time
Restore the default value.
spanning-tree loopback-guard
-
Enable protection that disables any interface when BPDU packet is
received.
no spanning-tree
loopbackguard
Disable protection that disables the interface when BPDU packet is
received.
spanning-tree max-age
seconds
seconds: (6..40)/20
seconds
Set the lifetime of the STP spanning tree.