Reference Guide

746 | Per-VLAN Spanning Tree Plus (PVST+)
www.dell.com | support.dell.com
FTOS supports three other variations of Spanning Tree, as shown in Table 37-1.
Implementation Information
• The FTOS implementation of PVST+ is based on IEEE Standard 802.1d.
• The FTOS implementation of PVST+ uses IEEE 802.1s costs as the default costs (Table 37-2). Other
implementations use IEEE 802.1d costs as the default costs if you are using Dell Force10 systems in a
multi-vendor network, verify that the costs are values you intended.
• You must allocate at least the default minimum amount of Layer 2 ACL CAM space when employing
PVST+ on the E-Series. See Configure Ingress Layer 2 ACL Sub-partitions on page 276.
• On the C-Series and S-Series, you can enable PVST+ on 254 VLANs. To set up VLANs, see
Chapter 52, Virtual LANs (VLAN).
Configure Per-VLAN Spanning Tree Plus
Configuring PVST+ is a four-step process:
1. Configure interfaces for Layer 2.
2. Place the interfaces in VLANs.
3. Enable PVST+. See page 747.
4. Optionally, for load balancing, select a non-default bridge-priority for a VLAN. See page 747.
Related Configuration Tasks
• Modify Global PVST+ Parameters on page 749
• Modify Interface PVST+ Parameters on page 750
• Configure an EdgePort on page 751
• Flush MAC Addresses after a Topology Change on page 667
• Preventing Network Disruptions with BPDU Guard on page 953
• SNMP Traps for Root Elections and Topology Changes on page 958
Table 37-1. FTOS Supported Spanning Tree Protocols
Dell Force10 Term IEEE Specification
Spanning Tree Protocol (STP) 802.1d
Rapid Spanning Tree Protocol
(RSTP)
802.1w
Multiple Spanning Tree Protocol
(MSTP)
802.1s
Per-VLAN Spanning Tree Plus
(PVST+)
Third Party