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iv Table of Contents
EX2500 Ethernet Switch Configuration Guide
TACACS+ Authentication........................................................................14
How TACACS+ Authentication Works ..............................................14
TACACS+ Authentication Features in the EX2500 Switch ................14
Command Authorization and Logging...............................................16
Configuring TACACS+ Authentication on the Switch........................16
Secure Shell .............................................................................................17
Configuring SSH Features on the Switch ...........................................17
SSH Encryption of Management Messages........................................17
Generating RSA Host and Server Keys for SSH Access ......................17
SSH Integration with RADIUS and TACACS+ Authentication............18
End User Access Control..........................................................................18
Considerations for Configuring End User Accounts ...........................19
User Access Control ..........................................................................19
Listing Current Users.........................................................................20
Logging In to an End User Account ...................................................20
Chapter 2
VLANs 21
VLAN Overview..............................................................................................21
VLANs and Port VLAN ID Numbers ................................................................22
VLAN Numbers........................................................................................22
PVID Numbers.........................................................................................22
VLAN Tagging ................................................................................................23
VLAN Topologies and Design Considerations .................................................26
VLAN Configuration Rules .......................................................................26
Multiple VLANs Configuration Example ...................................................27
Private VLANs ................................................................................................29
Private VLAN Ports ..................................................................................29
Private VLAN Configuration Guidelines....................................................30
Private VLAN Configuration Example ......................................................30
Chapter 3
Spanning Tree Protocol 31
Spanning Tree Overview................................................................................31
Bridge Protocol Data Units (BPDUs).........................................................32
Determining the Path for Forwarding BPDUs....................................32
Bridge Priority...................................................................................32
Port Priority ......................................................................................33
Port Path Cost ...................................................................................33
Spanning Tree Group Configuration Guidelines .......................................33
Changing the Spanning Tree Mode....................................................33
Assigning a VLAN to a Spanning Tree Group .....................................33
Creating a VLAN................................................................................34
Rules for VLAN Tagged Ports.............................................................34
Adding and Removing Ports from STGs ............................................34
Rapid Spanning Tree Protocol........................................................................35
Port State Changes ..................................................................................35
Port Type and Link Type .........................................................................36
Edge Port ..........................................................................................36
Link Type ..........................................................................................36
RSTP Configuration Guidelines ................................................................36
RSTP Configuration Example...................................................................36
Per VLAN Rapid Spanning Tree......................................................................37
Default Spanning Tree Configuration.......................................................37
Why Do We Need Multiple Spanning Trees?............................................37