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Summit24e3 Switch Installation and User Guide
Spanning Tree Protocol (STP)
A port can belong to only one STPD. If a port is a member of multiple VLANs, then all those VLANs
must belong to the same STPD.
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
NOTE
Ensure that multiple STPD instances within a single switch do not see each other in the same
broadcast domain. This could happen if, for example, another external bridge is used to connect VLANs
belonging to separate STPDs.
If you delete an 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.
Defaults
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.
STPD BPDU Tunneling
You can configure ExtremeWare to allow a BDPU to traverse a VLAN without being processed by STP,
even if STP is enabled on the port. This is known as BPDU tunneling.
To enable and disable BPDU tunneling on a VLAN, use the following command:
[enable | disable] ignore-bpdu vlan <name>
If you have a known topology and have switches outside of your network within your STPD, use this
feature to keep the root bridge within your network.
STP Configurations
When you assign VLANs to an STPD, pay careful attention to the STP configuration and its effect on
the forwarding of VLAN traffic.
Figure 26 illustrates a network that uses VLAN tagging for trunk connections. The following four
VLANs have been defined:
•
Sales is defined on switch A, switch B, and switch M.
•
Personnel is defined on switch A, switch B, and switch M.
•
Manufacturing is defined on switch Y, switch Z, and switch M.
•
Engineering is defined on switch Y, switch Z, and switch M.
Содержание Summit Summit24
Страница 12: ...12 Contents Summit24e3 Switch Installation and User Guide Index Index of Commands ...
Страница 14: ...14 Figures Summit24e3 Switch Installation and User Guide ...
Страница 24: ...24 Summit24e3 Switch Installation and User Guide Summit24e3 Switch Overview ...
Страница 32: ...32 Summit24e3 Switch Installation and User Guide Switch Installation ...
Страница 78: ...78 Summit24e3 Switch Installation and User Guide Configuring Ports on a Switch ...
Страница 118: ...118 Summit24e3 Switch Installation and User Guide Network Address Translation NAT ...
Страница 132: ...132 Summit24e3 Switch Installation and User Guide Ethernet Automatic Protection Switching ...
Страница 146: ...146 Summit24e3 Switch Installation and User Guide Quality of Service QoS ...
Страница 158: ...158 Summit24e3 Switch Installation and User Guide Status Monitoring and Statistics ...
Страница 204: ...204 Summit24e3 Switch Installation and User Guide Interior Gateway Routing Protocols ...
Страница 212: ...212 Summit24e3 Switch Installation and User Guide Safety Information ...
Страница 216: ...216 Summit24e3 Switch Installation and User Guide Supported Standards ...
Страница 238: ...238 Index Summit24e3 Switch Installation and User Guide ...
Страница 244: ...244 Index of Commands Summit24e3 Switch Installation and User Guide ...