User guide
Table Of Contents
- Part1
- Part2
- Part2
- Part3
- Part4
- Part5
- Dynamic Link Aggregation
- Link Aggregation ID
- RADIUS
- Configuring RADIUS Server Settings
- Configuring IEEE802.1x
- Supported MIBs
- SNMP Traps
- Configuring SNMP
- Setting Up Login Accounts
- Requirements for Using SSH
- HTTPS Example
- Internet Explorer Warning Messages
- Netscape Navigator Warning Messages
- Login Screen
- Strict Priority Queuing (SPQ)
- Weighted Round Robin Scheduling (WRR)
- DiffServ
- DSCP and Per-Hop Behavior
- DHCP “Relay Agent Information Option”
- DHCP Relay Agent Circuit ID Sub-option Format
- Part6
- Part7
- Switch Configuration File
- Access Priority
- The Console Port
- Telnet
- List of Available Commands
- Detailed Command Information
- Logging Out
- User Mode
- Enable Mode
- Configure Mode
- config-vlan Commands
- interface Commands
- show system-information
- show hardware-monitor
- show ip
- show logging
- show interface
- show mac address-table
- Backing up Configuration
- Restoring Configuration
- Using a Different Configuration File
- Resetting to the Factory Default
- no mirror-port
- no https timeout
- no trunk
- no port-access-authenticator
- no ssh
- interface
- bpdu-control
- broadcast-limit
- bandwidth-limit
- mirror
- gvrp
- ingress-check
- frame-type
- vlan-trunking
- spq
- wrr
- egress set
- qos priority
- name
- speed-duplex
- Static Entries (SVLAN Table)
- Dynamic Entries (DVLAN Table)
- GARP Status
- GARP Timer
- GVRP Timer
- Enable GVRP
- Disable GVRP
- Set Port VID
- Set Acceptable Frame Type
- Enable or Disable Port GVRP
- Modify Static VLAN
- Delete VLAN ID
Dimension GS-3012 Gigabit Ethernet Switch
DHCP Relay 21-1
This chapter describes the DHCP relay and shows you how to configure the DHCP Relay screen.
21.1 Overview
DHCP (Dynamic Host Configuration Protocol, RFC 2131 and RFC 2132) allows individual clients to obtain
TCP/IP configuration at start-up from a DHCP server. You can configure the switch to relay client TCP/IP
configuration requests to a DHCP server and the server’s responses back to the clients.
21.1.1 DHCP “Relay Agent Information Option”
The switch can add information to client TCP/IP configuration requests that it relays to a DHCP server. This helps
provide authentication about the source of the requests. You can also specify additional information for the switch
to add to the client TCP/IP configuration requests that it relays to the DHCP server. Please refer to RFC 3046 for
more details.
21.1.2 DHCP Relay Agent Circuit ID Sub-option Format
The DHCP relay agent information feature adds an Agent Information field to the option 82 field of the DHCP
headers of client TCP/IP configuration request frames that the switch relays to a DHCP server. The Agent
Information field that the switch adds contains an “Agent Circuit-ID sub-option” that includes the port number,
VLAN ID and optional information about the port where the TCP/IP configuration request was received.
21.2 DHCP Relay Configuration
To configure DHCP relay information and specify the DHCP server(s), click Advanced Application and DHCP
Relay to display the screen as shown next.
Chapter 21
DHCP
Relay