Cisco ME 3400 User Manual

Contents
xiii
Cisco ME 3400 Ethernet Access Switch Software Configuration Guide
OL-9639-07
CHAPTER 14 Configuring STP 14-1
Understanding Spanning-Tree Features 14-1
STP Overview 14-2
Spanning-Tree Topology and BPDUs 14-3
Bridge ID, Switch Priority, and Extended System ID 14-4
Spanning-Tree Interface States 14-4
Blocking State 14-6
Listening State 14-6
Learning State 14-7
Forwarding State 14-7
Disabled State 14-7
How a Switch or Port Becomes the Root Switch or Root Port 14-7
Spanning Tree and Redundant Connectivity 14-8
Spanning-Tree Address Management 14-9
Accelerated Aging to Retain Connectivity 14-9
Spanning-Tree Modes and Protocols 14-9
Supported Spanning-Tree Instances 14-10
Spanning-Tree Interoperability and Backward Compatibility 14-10
STP and IEEE 802.1Q Trunks 14-11
Configuring Spanning-Tree Features 14-11
Default Spanning-Tree Configuration 14-11
Spanning-Tree Configuration Guidelines 14-12
Enabling Spanning Tree on an ENI 14-13
Changing the Spanning-Tree Mode. 14-14
Disabling Spanning Tree 14-15
Configuring the Root Switch 14-15
Configuring a Secondary Root Switch 14-17
Configuring Port Priority 14-17
Configuring Path Cost 14-19
Configuring the Switch Priority of a VLAN 14-20
Configuring Spanning-Tree Timers 14-21
Configuring the Hello Time 14-21
Configuring the Forwarding-Delay Time for a VLAN 14-22
Configuring the Maximum-Aging Time for a VLAN 14-22
Displaying the Spanning-Tree Status 14-23

Cisco ME 3400 Specifications

General

Category	Switch
Rack Mountable	Yes
Jumbo Frame Support	Yes
Authentication Method	RADIUS, TACACS+
RAM	128 MB
Flash Memory	32 MB
Power Device	Internal power supply
Model	ME 3400
Layer	Layer 2
MAC Address Table Size	8000 entries
Remote Management Protocol	SNMP, Telnet, SSH, HTTP, HTTPS
Features	VLAN support, IGMP snooping, Quality of Service (QoS)
Compliant Standards	IEEE 802.3, IEEE 802.3u, IEEE 802.1D, IEEE 802.1Q, IEEE 802.3ab, IEEE 802.3x
Memory	128 MB
Power Supply	AC 120/230 V (50/60 Hz)
Dimensions (H x W x D)	4.4 cm x 44.5 cm x 24.2 cm
Routing Protocol	Static routing