SMC Networks TigerSwitch SMC6128PL2 User Manual

DHCP S NOOPING C OMMANDS
4-305
ip dhcp snooping trust (4-305)
ip dhcp snooping trust
This command configures the specified interface as trusted. Use the no
form to restore the default setting.
Syntax
[no] ip dhcp snooping trust
Default Setting
All interfaces are untrusted
Command Mode
Interface Configuration (Ethernet, Port Channel)
Command Usage
• An untrusted interface is an interface that is configured to receive
messages from outside the network or firewall. A trusted interface is
an interface that is configured to receive only messages from within
the network.
• When DHCP snooping enabled globally using the ip dhcp snooping
command (page -301), and enabled on a VLAN with this command,
DHCP packet filtering will be performed on any untrusted ports
within the VLAN according to the default status, or as specifically
configured for an interface with the no ip dhcp snooping trust
command.
• When an untrusted port is changed to a trusted port, all the dynamic
DHCP snooping bindings associated with this port are removed.
• Additional considerations when the switch itself is a DHCP client – The port(s)
through which it submits a client request to the DHCP server must be
configured as trusted.
Example
This example sets port 5 to untrusted.
Console(config)#interface ethernet 1/5
Console(config-if)#no ip dhcp snooping trust
Console(config-if)#

SMC Networks TigerSwitch SMC6128PL2 Specifications

General

PoE	Yes
PoE Ports	24
Switching Capacity	12.8 Gbps
Forwarding Rate	9.5 Mpps
Layer	Layer 2
MAC Address Table Size	8K
Jumbo Frame Support	9 KB
Power Supply	Internal
Weight	3.6 kg
Operating Temperature	0°C to 40°C
Storage Temperature	-40°C to 70°C
Humidity	10% to 90% non-condensing
Features	VLAN, QoS, IGMP Snooping, Link Aggregation, Port Mirroring
Ports	24 x 10/100 Mbps + 4 x Gigabit Combo (RJ45/SFP)

Summary

Introduction

Key Features

Lists key features and capabilities of the switch, including port specifications and management options.

Description of Software Features

Details advanced performance features like flow control, broadcast storm suppression, and VLAN support.

Authentication

Explains management access authentication via console, Telnet, web, RADIUS, TACACS+, and 802.1X.

Access Control Lists

Virtual LANs

Initial Configuration

Connecting to the Switch

Details steps for connecting to the switch via console port or Telnet for configuration.

Basic Configuration

Setting an IP Address

Configures manual or dynamic IP address settings for management access over the network.

Enabling SNMP Management Access

Configuring the Switch

Using the Web Interface

Describes configuring the switch and viewing statistics via a web browser.

Configuring Event Logging

Simple Network Management Protocol (SNMP)

Explains the SNMP protocol for network device management, including versions 1, 2c, and 3.

User Authentication

Restricts management access using local or remote authentication methods.

Configuring the Secure Shell

Details SSH server configuration for secure remote management access.

Configuring Port Security

Allows configuring MAC addresses authorized to access switch ports.

Configuring 802.1X Port Authentication

Implements port-based access control preventing unauthorized network access.

Access Control Lists

Provides packet filtering for IP frames or any frames based on addresses or protocols.

Port Configuration

Creating Trunk Groups

Configuring Rate Limits

Power Over Ethernet Settings

Configures DC power supply to connected devices via Ethernet, including power budget and priority.

Spanning Tree Algorithm Configuration

Configures Spanning Tree protocols (STP, RSTP, MSTP) globally and for interfaces.

VLAN Configuration

Describes creating VLAN groups, adding members, and configuring VLAN behavior.

Switch Clustering

Groups switches for centralized management through a Commander/Member unit structure.

Quality of Service Commands

Configures QoS classification criteria and service policies using DiffServ.

Multicast Filtering Commands

Supports real-time applications like videoconferencing or streaming audio using IGMP.

Multicast VLAN Registration

DHCP Snooping Commands

Protects the network from rogue DHCP servers by filtering DHCP messages.

Command Line Interface

Using the Command Line Interface

Guides on using the CLI for switch management via keywords and parameters.

Configuration Commands

System Management Commands

IP Filter Commands

Secure Shell Commands

Event Logging Commands

Flash/File Commands

Authentication Commands

RADIUS Client Commands

TACACS+ Client

Port Security Commands

802.1X Port Authentication

Access Control List Commands

SNMP Commands

Interface Commands

Mirror Port Commands

Rate Limit Commands

Link Aggregation Commands

Address Table Commands

Spanning Tree Commands

VLAN Commands

Class of Service Configuration

Specifies data packet precedence based on congestion and priority queues.

IP Source Guard Commands

Filters IP traffic based on configured entries in the IP Source Guard table.

Switch Cluster Commands

Appendix B Troubleshooting

Problems Accessing the Management Interface