Load Sharing Using Stp Port Priorities; Configuring Stp Port Priorities And Load Sharing - Cisco WS-C3550-12G Software Configuration Manual
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Understanding VLAN Trunks
Load Sharing Using STP Port Priorities
When two ports on the same switch form a loop, the STP port priority setting determines which port is
enabled and which port is in a blocking state. You can set the priorities on a parallel trunk port so that
the port carries all the traffic for a given VLAN. The trunk port with the higher priority (lower values)
for a VLAN is forwarding traffic for that VLAN. The trunk port with the lower priority (higher values)
for the same VLAN remains in a blocking state for that VLAN. One trunk port sends or receives all
traffic for the VLAN.
Figure 9-5
configured as follows:
•
•
•
•
In this way, Trunk 1 carries traffic for VLANs 8 through 10, and Trunk 2 carries traffic for VLANs 3
through 6. If the active trunk fails, the trunk with the lower priority takes over and carries the traffic for
all of the VLANs. No duplication of traffic occurs over any trunk port.
Figure 9-5
VLANs 8 – 10 (priority 10)
VLANs 3 – 6 (priority 128)
Configuring STP Port Priorities and Load Sharing
Beginning in privileged EXEC mode, follow these steps to configure the network shown in
Command
Step 1
vlan database
Step 2
vtp domain domain-name
Step 3
vtp server
Step 4
exit
Step 5
show vtp status
Catalyst 3550 Multilayer Switch Software Configuration Guide
9-30
shows two trunks connecting supported switches. In this example, the switches are
VLANs 8 through 10 are assigned a port priority of 10 on Trunk 1.
VLANs 3 through 6 retain the default port priority of 128 on Trunk 1.
VLANs 3 through 6 are assigned a port priority of 10 on Trunk 2.
VLANs 8 through 10 retain the default port priority of 128 on Trunk 2.
Load Sharing by Using STP Port Priorities
Trunk 1
Switch 2
Switch 1
Trunk 2
VLANs 3 – 6 (priority 10)
VLANs 8 – 10 (priority 128)
Purpose
On Switch 1, enter VLAN configuration mode.
Configure a VTP administrative domain.
The domain name can be from 1 to 32 characters.
Configure Switch 1 as the VTP server.
Update the VLAN database, propagate it throughout the
administrative domain, and return to privileged EXEC mode.
Verify the VTP configuration on both Switch 1 and Switch 2.
In the display, check the VTP Operating Mode and the VTP Domain
Name fields.
Chapter 9
Creating and Maintaining VLANs
Figure
9-5:
78-11194-03
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