Cisco Catalyst 3750 Software Configuration Guide

CHAPTER
16-1
Catalyst 3750 Metro Switch Software Configuration Guide
78-15870-01
16
Configuring Optional Spanning-Tree Features
This chapter describes how to configure optional spanning-tree features on the Catalyst 3750 Metro
switch. You can configure all of these features when your switch is running the per-VLAN spanning-tree
plus (PVST+). You can configure only the noted features when your switch is running the Multiple
Spanning Tree Protocol (MSTP) or the rapid per-VLAN spanning-tree plus (rapid-PVST+) protocol.
For information on configuring the PVST+ and rapid PVST+, see Chapter 14, “Configuring STP.” For
information about the Multiple Spanning Tree Protocol (MSTP) and how to map multiple VLANs to the
same spanning-tree instance, see Chapter 15, “Configuring MSTP.”
Note For complete syntax and usage information for the commands used in this chapter, refer to the command
reference for this release.
This chapter consists of these sections:
• Understanding Optional Spanning-Tree Features, page 16-1
• Configuring Optional Spanning-Tree Features, page 16-9
• Displaying the Spanning-Tree Status, page 16-16
Understanding Optional Spanning-Tree Features
These sections describe how the optional spanning-tree features work:
• Understanding Port Fast, page 16-2
• Understanding BPDU Guard, page 16-3
• Understanding BPDU Filtering, page 16-3
• Understanding UplinkFast, page 16-4
• Understanding BackboneFast, page 16-5
• Understanding Root Guard, page 16-7
• Understanding Loop Guard, page 16-8

Cisco Catalyst 3750 Specifications

General

Device Type	Switch
Switching Capacity	32 Gbps
Forwarding Rate	38.7 Mpps
Stacking Bandwidth	32 Gbps
RAM	128 MB
Jumbo Frame Support	Yes
Switch Type	Managed
Model	Catalyst 3750 Series
Uplink Interfaces	SFP
Form Factor	Rack-mountable
MAC Address Table Size	12, 000 entries
Routing Protocol	RIP, OSPF, EIGRP
Remote Management Protocol	SNMP, Telnet, HTTP
Features	Layer 3 switching, Layer 2 switching, auto-negotiation, BOOTP support, ARP support, VLAN support, auto-uplink (auto MDI/MDI-X), IGMP snooping, traffic shaping, MAC address filtering, Quality of Service (QoS), Jumbo Frames support, MLD snooping, Dynamic ARP Inspection (DAI), Cisco EnergyWise technology
Power over Ethernet (PoE)	PoE
Operating Temperature	-5 - 45 °C
Operating Humidity	10% to 85% non-condensing