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 the following:
•Each VLAN forms an independent broadcast domain.
•STP blocks paths to create a
•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.
Care must be taken to ensure that STPD instances within a single Summit
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 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.
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.
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 7-1 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.
•Marketing is defined on all switches (Switch A, Switch B, Switch Y, Switch Z, and Switch M).
SUMMIT SWITCH INSTALLATION AND USER GUIDE |
