Securing Access to the Switch | Juniper Networks EX2500 guide

EX2500 Ethernet Switch Configuration Guide

SNMPv3 Trap Host Configuration

To configure a user for SNMPv3 traps, you can choose to send the traps with both privacy and authentication, with authentication only, or without privacy or authentication.

This is configured in the access table with the following commands:

ex2500(config)# snmp-server access <1-32>level ex2500(config)# snmp-server target-parameters <1-16>

Configure the user in the user table accordingly.

It is not necessary to configure the community table for SNMPv3 traps because the community string is not used by SNMPv3.

The following example shows how to configure a SNMPv3 user v3trap with authentication only:

ex2500(config)# snmp-server user 11 name v3trap ex2500(config)# snmp-server user 11 authentication-protocol md5 authentication-password

Changing authentication password; validation required: Enter current admin password: <admin. password> Enter new authentication password: <auth. password> Re-enter new authentication password: <auth. password> New authentication password accepted. ex2500(config)# snmp-server access 11 notify-view iso ex2500(config)# snmp-server access 11 level authnopriv ex2500(config)# snmp-server group 11 user-name v3trap ex2500(config)# snmp-server group 11 tag v3trap ex2500(config)# snmp-server notify 11 name v3trap ex2500(config)# snmp-server notify 11 tag v3trap

ex2500(config)# snmp-server target-address 11 name v3trap address 47.81.25.66 ex2500(config)# snmp-server target-address 11 taglist v3trap ex2500(config)# snmp-server target-address 11 parameters-name v3param ex2500(config)# snmp-server target-parameters 11 name v3param ex2500(config)# snmp-server target-parameters 11 user-name v3trap ex2500(config)# snmp-server target-parameters 11 level authNoPriv

Securing Access to the Switch

Secure switch management is needed for environments that perform significant management functions across the Internet. Common functions for secured management are described in the following sections:

RADIUS Authentication and Authorization on page 11

TACACS+ Authentication on page 14

End User Access Control on page 18

10 Securing Access to the Switch

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Juniper Networks EX2500 manual Securing Access to the Switch, SNMPv3 Trap Host Configuration

Contents

Configuration Guide North Mathilda Avenue Sunnyvale, CA Ii „ Table of Contents Chapter VLANs Chapter Ports and Trunking Rmon Overview Rmon Group 1-Statistics Rmon Group 2-History Port Mirroring Overview Configuring Port Mirroring AppendixesIndexes Default Vlan Settings Port-Based Vlan AssignmentPage List of Tables EX2500 Ethernet Switch Configuration Guide „ List of Tables About This Guide ObjectivesAudience Supported Platforms Documentation Conventions Icon Meaning Description List of Technical Publications Documentation FeedbackRequesting Technical Support Self-Help Online Tools and Resources Opening a Case with Jtac EX2500 Ethernet Switch Applications Page Accessing the Switch Configuring the Management Interface Dynamic Host Configuration Protocol Configure the default gateway. Enable the gateway Using Telnet Using the EX2500 Web Device Manager Configuring EX2500 Web Device Manager Access via Http Configuring EX2500 Web Device Manager Access via Https Using Snmp SNMPv1, SNMPv2 Default Configuration User ConfigurationSNMPv3 Configuring Snmp Trap Hosts SNMPv1 Trap Host ConfigurationSNMPv2 Trap Host Configuration Configure an entry in the notify table Securing Access to the Switch SNMPv3 Trap Host Configuration Radius Authentication and Authorization How Radius Authentication WorksConfiguring Radius on the Switch Configure the Radius secret Radius Authentication Features in the EX2500 Switch Switch User Accounts Radius Attributes for EX2500 User Privileges TACACS+ Authentication How TACACS+ Authentication WorksTACACS+ Authentication Features in the EX2500 Switch „ starttime „ stoptime „ elapsedtime „ disccause Command Authorization and Logging Configuring TACACS+ Authentication on the SwitchConfigure the TACACS+ secret and second secret Configuring SSH Features on the Switch Generating RSA Host and Server Keys for SSH AccessSecure Shell SSH Encryption of Management Messages End User Access Control SSH Integration with Radius and TACACS+ Authentication Considerations for Configuring End User Accounts User Access Control Listing Current Users Logging In to an End User Account VLANs Vlan Overview „ Port configuration VLANs and Port Vlan ID NumbersVlan Numbers Pvid Numbers Illustrates the default Vlan settings on the switch Vlan Tagging Default Vlan Settings Port-Based Vlan Assignment Vlan Configuration Rules Vlan Topologies and Design Considerations Multiple VLANs Configuration Example Multiple VLANs example in is described in Table Enable tagging on uplink ports that support multiple VLANs Private VLANs Private Vlan Ports Private Vlan Configuration Guidelines Private Vlan Configuration ExampleConfigure a secondary Vlan and map it to the primary Vlan Verify the configuration Spanning Tree Protocol Spanning Tree Overview Bridge Protocol Data Units BPDUs Determining the Path for Forwarding BPDUsBridge Priority Spanning Tree Group Configuration Guidelines Changing the Spanning Tree ModePort Priority Port Path Cost Creating a Vlan Rules for Vlan Tagged PortsAdding and Removing Ports from STGs Rapid Spanning Tree Protocol Port State Changes Rstp Configuration Guidelines Rstp Configuration ExamplePort Type and Link Type Edge Port Default Spanning Tree Configuration Why Do We Need Multiple Spanning Trees?Per Vlan Rapid Spanning Tree Pvrst Configuration Guidelines Configuring Pvrst Mstp Configuration Guidelines Multiple Spanning Tree ProtocolMstp Region Common Internal Spanning Tree Multiple Spanning Tree Groups Configuration Example Implementing Multiple Spanning Tree Groups Fast Uplink Convergence Vlan Configuration Guidelines Configuring Fast Uplink Convergence Ports and Trunking Trunking OverviewStatistical Load Distribution Built-In Fault Tolerance Before Configuring Static TrunksTrunk Group Configuration Rules Port Trunking Configuration Example Port Trunk Group Configuration Example Follow these steps on the EX2500 switch Define a trunk group Configurable Trunk Hash Algorithm Link Aggregation Control Protocol„ Destination MAC Dmac „ Destination IP DIP 48 „ Link Aggregation Control Protocol Lacp Configuration Guidelines Configuring LacpOptionally Reducing Lacp Timeout Set the Lacp mode Ex2500config-if# lacp timeout short ex2500config-if# exit Quality of Service QoS Overview Using ACL Filters COS MAC Extended ACLs IP Standard ACLsTo delete a MAC Extended ACL To delete an IP Standard ACL IP Extended ACLs To delete an IP Extended ACL Understanding ACL Priority TCP/UDP ACL Configuration Examples Assigning ACLs to a PortViewing ACL Statistics ACL Example 1-Blocking Traffic to a Host ACL Example 3-Blocking Http Traffic Add the ACL to a port ACL Example 4-Blocking All Except Certain Packets Assign the ACLs to a port Using Storm Control Filters Configuring Storm ControlBroadcast Storms Using Dscp Values to Provide QoS Differentiated Services Concepts Per Hop Behavior Assured Forwarding Drop Precedence Class Use the following command to perform Dscp mapping QoS LevelsDscp Mapping Using 802.1p Priority to Provide QoS Shows the priority bits in a VLAN-tagged packet Queuing and Scheduling Remote Monitoring Rmon Overview Configure the Rmon statistics on a port Rmon Group 1-Statistics Configuring Rmon History Configure the Rmon History parameters for a portThis configuration enables Rmon History collection on port Rmon Group 2-History Rmon Group 3-Alarms Alarm MIB ObjectsConfiguring Rmon Alarms Configure the Rmon Alarm parameters to track Icmp messages Ex2500config# rmon event 110 type log-only Rmon Group 9-EventsPage Igmp Igmp Snooping FastLeave Igmp Snooping Configuration Example IGMPv3 Snooping Static Multicast Router Ex2500# show ip igmp groups High Availability Through Uplink Failure Detection High Availability Overview Spanning Tree Protocol with UFD UFD Configuration Guidelines Failure Detection Pair UFD Configuration Example Monitoring UFDPage Appendixes EX2500 Ethernet Switch Configuration Guide 80 „ Appendixes „ Port Mirroring Overview on „ Configuring Port Mirroring on Port Mirroring Overview Configuring Port Mirroring Indexes „ Index on EX2500 Ethernet Switch Configuration Guide 84 „ Indexes Index Numerics Management interface, configuring Multi-links between switches, port trunkingPhysical. See switch ports Internet Group Management Protocol. See Igmp Quality of Service. See QoS QoSSecurity Segmentation. See IP subnets Segments. See IP subnets Virtual Local Area Networks. See VLANs Example showing multiple VLANs