Blade ICE RACKSWITCH G8124-E - Manual (Page 129)

BLADEOS 6.5.2 Application Guide
BMD00220, October 2010 Chapter 8: Spanning Tree Protocols 129
MSTP Configuration Example 2
This configuration shows how to configure MSTP Groups on the switch, as shown in Figure 12 .
Figure 13 Implementing Multiple Spanning Tree Groups
This example shows how multiple Spanning Trees can provide redundancy without wasting any
uplink ports. In this example, the server ports are split between two separate VLANs. Both VLANs
belong to two different MSTP groups. The Spanning Tree priority values are configured so that
each routing switch is the root for a different MSTP instance. All of the uplinks are active, with each
uplink port backing up the other.
Enterprise
Routing Switch
MSTP Group 1
Root
Enterprise
Routing Switch
MSTP Group 2
Root
Server 1
VLAN 1
Server 2
VLAN 1
Server 3
VLAN 2
Server 4
VLAN 2
Blocking VLAN 1
Passing VLAN 2
Passing VLAN 1
Blocking VLAN 2