Stp Rules And Restrictions; Configuring Stp On The Switch - Extreme Networks ExtremeWare XOS Guide Manual

STP Rules and Restrictions

This section summarizes the rules and restrictions for configuring STP as follows:
The carrier VLAN must span all ports of the STPD.
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The StpdID must be the VLANid of the carrier VLAN; the carrier VLAN cannot be partitioned.
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A default VLAN cannot be partitioned. If a VLAN traverses multiple STPDs, the VLAN must be
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tagged.
An STPD can carry, at most, one VLAN running in PVST+ mode, and its StpdID must be identical
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with that VLANid. In addition, the PVST+ VLAN cannot be partitioned.
The default VLAN of a PVST+ port must be identical with the native VLAN on the PVST+ device
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connected to that port.
If an STPD contains both PVST+ and non-PVST+ ports, that STPD must be enabled. If that STPD is
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disabled, the BPDUs are flooded in the format of the incoming STP port, which may be incompatible
with those of the connected devices.
The 802.1D ports must be untagged; and the EMISTP/PVST+ ports must be tagged in the carrier
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VLAN.
An STPD with multiple VLANs must contain only VLANs that belong to the same virtual router
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instance.
Automatically adding ports to an STPD (known as STP autobind) cannot be configured on a
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Netlogin VLAN.
STP cannot be configured on the following ports:
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A mirroring target port.
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A software-controlled redundant port.
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A Netlogin port.
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Configuring STP on the Switch

To configure basic STP:
1 Create one or more STPDs using the following command:
create stpd <stpd_name>
2 Add one or more VLANs to the STPD using the following command:
configure stpd <stpd_name> add vlan <vlan_name> ports [all | <port_list>] {[dot1d
| emistp | pvst-plus]}
3 Define the carrier VLAN using the following command:
configure stpd <stpd_name> tag <stpd_tag>
NOTE
The carrier VLAN's VLANid must be identical to the StpdID of the STPD.
4 Enable STP for one or more STPDs using the following command:
enable stpd {<stpd_name>}
After you have created the STPD, you can optionally configure STP parameters for the STPD.
ExtremeWare XOS 11.3 Concepts Guide
STP Rules and Restrictions
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