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ExtremeWare 7.7 Command Reference Guide
STP Commands
Spanning Tree Domains
The switch can be partitioned into multiple virtual bridges. Each virtual bridge can run an independent
Spanning Tree instance. Each Spanning Tree instance is called a
Spanning Tree Domain
(STPD). Each
STPD has its own root bridge and active path. After an STPD is created, one or more VLANs can be
assigned to it.
A port can belong to multiple STPDs. In addition, a VLAN can span multiple STPDs.
The key points to remember when configuring VLANs and STP are:
•
Each VLAN forms an independent broadcast domain.
•
STP blocks paths to create a loop-free environment.
•
When STP blocks a path, no data can be transmitted or received on the blocked port.
•
Within any given STPD, all VLANs belonging to it use the same spanning tree.
If you delete a STPD, the VLANs that were members of that STPD are also deleted. You must remove
all VLANs associated with the STP before deleting the STPD.
STPD Modes
An STPD has two modes of operation:
•
802.1d mode
Use this mode for backward compatibility with previous STP versions and for compatibility with
third-party switches using IEEE standard 802.1d. When an STPD is configured in this mode, all
rapid configuration mechanisms are disabled.
•
802.1w mode
Use this mode for compatibility with Rapid Spanning Tree (RSTP). When an STPD is configured in
this mode, all rapid configuration mechanisms are enabled. This mode is available for point-to-point
links only.
RSTP is enabled or disabled on a per STPD basis only. You do not enable RSTP on a per port basis.
•
mstp mode
Use this mode for compatibility with Multiple Spanning Tree (MSTP, 802.1s). MSTP is an extension
of RSTP and offers the benefit of better scaling with fast convergence. When an STPD is configured
in this mode, all rapid configuration mechanisms are enabled. Like 802.1w mode, the benefit of
MSTP mode is available on point-to-point links and when the peer is likewise configured in MSTP
mode.
You can create only one MSTP region on the switch, and all switches that participate in the region
must have the same regional configurations. You enable or disable an MSTP on a per STPD basis
only. You do not enable MSTP on a per port basis.
By default, the following conditions exist:
•
STPD operates in 802.1d mode.
•
The default device configuration contains a single STPD called s0
.
•
The default VLAN is a member of STPD s0.
All STP parameters default to the IEEE 802.1d values, as appropriate.
Summary of Contents for ExtremeWare 7.7
Page 60: ...60 ExtremeWare 7 7 Command Reference Guide Contents ...
Page 72: ...72 ExtremeWare 7 7 Command Reference Guide Command Reference Overview ...
Page 404: ...404 ExtremeWare 7 7 Command Reference Guide VLAN Commands ...
Page 472: ...472 ExtremeWare 7 7 Command Reference Guide QoS Commands ...
Page 492: ...492 ExtremeWare 7 7 Command Reference Guide NAT Commands ...
Page 890: ...890 ExtremeWare 7 7 Command Reference Guide Security Commands ...
Page 1130: ...1130 ExtremeWare 7 7 Command Reference Guide Security Commands ...
Page 1164: ...1164 ExtremeWare 7 7 Command Reference Guide Configuration and Image Commands ...
Page 1436: ...1436 ExtremeWare 7 7 Command Reference Guide Wireless Commands ...
Page 1490: ...1490 ExtremeWare 7 7 Command Reference Guide EAPS Commands ...
Page 1576: ...1576 ExtremeWare 7 7 Command Reference Guide ESRP Commands ...
Page 1774: ...1774 ExtremeWare 7 7 Command Reference Guide IP Unicast Commands ...
Page 1914: ...1914 ExtremeWare 7 7 Command Reference Guide IGP Commands ...
Page 2000: ...2000 ExtremeWare 7 7 Command Reference Guide BGP Commands i Series Switches Only ...
Page 2140: ...2140 ExtremeWare 7 7 Command Reference Guide IPX Commands i Series Platforms Only ...
Page 2156: ...2156 ExtremeWare 7 7 Command Reference Guide ARM Commands BlackDiamond Switch Only ...
Page 2168: ...2168 ExtremeWare 7 7 Command Reference Guide Remote Connect Commands ...
Page 2346: ...2346 ExtremeWare 7 7 Command Reference Guide PoS Commands BlackDiamond Switch Only ...
Page 2446: ...2446 ExtremeWare 7 7 Command Reference Guide LLDP Commands ...
Page 2496: ...2496 ExtremeWare 7 7 Command Reference Guide H VPLS Commands BlackDiamond Switch Only ...
Page 2620: ...2620 ExtremeWare 7 7 Command Reference Guide Index of Commands ...