Cisco Catalyst 2960-XR Configuration Guide

Additional References for Spanning-Tree Protocol 39
Feature Information for STP 40
CHAPTER 3 Configuring Multiple Spanning-Tree Protocol 41
Finding Feature Information 41
Prerequisites for MSTP 41
Restrictions for MSTP 42
Information About MSTP 43
MSTP Configuration 43
MSTP Configuration Guidelines 44
Root Switch 44
Multiple Spanning-Tree Regions 45
IST, CIST, and CST 46
Operations Within an MST Region 46
Operations Between MST Regions 47
IEEE 802.1s Terminology 47
Illustration of MST Regions 48
Hop Count 49
Boundary Ports 49
IEEE 802.1s Implementation 50
Port Role Naming Change 50
Interoperation Between Legacy and Standard Switches 50
Detecting Unidirectional Link Failure 51
MSTP and Switch Stacks 52
Interoperability with IEEE 802.1D STP 52
RSTP Overview 52
Port Roles and the Active Topology 53
Rapid Convergence 54
Synchronization of Port Roles 55
Bridge Protocol Data Unit Format and Processing 56
Processing Superior BPDU Information 57
Processing Inferior BPDU Information 57
Topology Changes 57
Protocol Migration Process 58
Default MSTP Configuration 58
Catalyst 2960-XR Switch Layer 2 Configuration Guide, Cisco IOS Release 15.0(2)EX1
OL-29424-01 v
Contents

Cisco Catalyst 2960-XR Specifications

General

Stacking Bandwidth	80 Gbps
Layer Support	Layer 2 and Layer 3
Jumbo Frame Support	9198 bytes
RAM	512 MB
Input Voltage	100-240V AC
Model	Catalyst 2960-XR
Uplink Interfaces	4 x 1G SFP or 2 x 10G SFP+
Downlink Interfaces	24 or 48 x Gigabit Ethernet ports
Power Supply	Internal
MAC Address Table Size	16, 000 entries
PoE	Available on PoE models
Weight	4.5 kg
Features	energy efficiency
Stacking	Up to 8 switches
Operating Temperature	0 to 45°C