Mellanox MLNX-OS® User Manualfor SX1018HP Ethernet Managed Blade Switch

Rev 1.6.9
Mellanox Technologies
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host, is to converge quickly, while the required behavior of a port connected to a switch entity is
to converge based on the RSTP parameters.
Additionally, it adds security issues on a port and switch basis,
allowing the operator to deter-
mine the state and role of a port or the entire switch should an abnormal
event occur. For exam-
ple: If a port is configured to be root-guard, the
operator will not allow it to become a root-port
under any circumstances, regardless of any BPDU that will have been received on the port.
5.5.1 Port Priority and Cost
When two ports on a switch are part of a loop, the STP port priority and port path cost configura-
tion determine which port on the switch is put
in the forwarding state and which port is put in the
blocking state.
To configure port priority use the following command:
switch (config interface etherent <inf>)# spanning-tree port-priority <0-240>
To configure port path cost use the following command:
switch (config interface etherent <inf>)# spanning-tree cost <1-200000000>
5.5.2 Port Type
Port type has the following configuration options:
• edge
– is not assumed to be converged by the RSTP learning/forwarding mechanism. It
converges to forwarding quickly.
• normal – is assumed to be connected to a switch, thus it tries to be converged by the
RSTP learning/forwarding. However, if it does not receive any BPDUs, it is operation-
ally moved to be edge.
• network – is
assumed to be connected to a switch. If it does not receive any BPDUs, it
is moved to discarding state.
Each of these configuration options is mutually exclusive.
Port type is configured using the command spanning-tr
ee port type. It may be applied globally on
the switch (Config) level, which configures all switch interfaces. Another option is to configure
ports individually by entering the interface’s configuration mode.
• Global configuration:
switch (config)# spanning-tree port type {edge , normal , network} default
• Interface configuration:
switch (config interface etherent <inf>)# spanning-tree port type {edge , normal, net-
work}
5.5.3 BPDU Filter
Using BPDU filter prevents the CPU from sending/receiving BPDUs on specific ports.
It is recommended to configure the port type for all ports connected to hosts as edge
ports.