Home » Dell Manuals » Servers » Dell Force10 MXL Blade » Manual Viewer

Dell Force10 MXL Blade MXL 10/40GbE Switch IO Module FTOS Command Line Referen - Page 301

ip helper-address, ip helper-address hop-count disable

View all Dell Force10 MXL Blade manuals

Add to My Manuals
Save this manual to your list of manuals

Page 301 highlights

Related Commands ip domain-list Configures additional names. ip helper-address Specify the address of a DHCP server so that DHCP broadcast messages can be forwarded when the DHCP server is not on the same subnet as the client. Syntax ip helper-address ip-address To remove a DHCP server address, use the no ip helper-address command. Parameters ip-address Enter an IP address in dotted decimal format (A.B.C.D). Defaults Not configured. Command Modes INTERFACE Command History Usage Information Version 8.3.16.1 Introduced on MXL 10/40GbE Switch IO Module You can add multiple DHCP servers by entering the ip helper-address command multiple times. If multiple servers are defined, an incoming request is sent simultaneously to all configured servers and the reply is forwarded to the DHCP client. FTOS uses standard DHCP ports, that is UDP ports 67 (server) and 68 (client) for DHCP relay services. It listens on port 67 and if it receives a broadcast, the software converts it to unicast, and forwards to it to the DHCP-server with source port=68 and destination port=67. The server replies with source port=67, destination port=67 and FTOS forwards to the client with source port=67, destination port=68. ip helper-address hop-count disable Disable the hop-count increment for the DHCP relay agent. Syntax ip helper-address hop-count disable To re-enable the hop-count increment, use the no ip helper-address hop-count disable command. Defaults Enabled; the hops field in the DHCP message header is incremented by default Command Modes CONFIGURATION Command History Usage Information Version 8.3.16.1 Introduced on MXL 10/40GbE Switch IO Module This command disables the incrementing of the hops field when boot requests are relayed to a DHCP server through FTOS. If the incoming boot request already has a non-zero hops field, the message will be relayed with the same value for hops. However, the message is discarded if the hops field exceeds 16, to comply with the relay agent behavior specified in RFC 1542. IPv4 Routing | 301

Section	Page
About this Guide	9
Objectives	9
Audience	9
Conventions	9
Information Symbols	10
Related Documents	10
CLI Basics	11
Accessing the Command Line	11
Multiple Configuration Users	12
Navigating the Command Line Interface	12
Obtaining Help	13
Using the Keyword no	15
Filtering show Commands	15
Displaying All Output	16
Filtering Command Output Multiple Times	16
Command Modes	16
EXEC Mode	16
EXEC Privilege Mode	17
CONFIGURATION Mode	17
INTERFACE Mode	17
LINE Mode	18
MAC ACCESS LIST Mode	18
IP ACCESS LIST Mode	18
ROUTE-MAP Mode	18
PREFIX-LIST Mode	19
SPANNING TREE Mode	19
Per-VLAN SPANNING TREE Plus Mode	19
RAPID SPANNING TREE Mode	19
MULTIPLE SPANNING TREE Mode	20
PROTOCOL GVRP Mode	20
ROUTER OSPF Mode	20
ROUTER RIP Mode	20
File Management	21
Overview	21
Basic File Management Commands	21
Control and Monitoring	37
Commands	37
Important Points to Remember	67
u-Boot	81
Overview	81
Commands	81
Access Control Lists (ACL)	91
Overview	91
Commands Common to all ACL Types	91
Common IP ACL Commands	94
Standard IP ACL Commands	98
Extended IP ACL Commands	102
Common MAC Access List Commands	117
Standard MAC ACL Commands	120
Extended MAC ACL Commands	123
IP Prefix List Commands	127
Route Map Commands	132
Bare Metal Provisioning	143
Overview	143
Commands	143
Content Addressable Memory (CAM)	147
Overview	147
CAM Profile Commands	147
Important Points to Remember	147
Data Center Bridging	153
Overview	153
DCB Command	153
PFC Commands	153
ETS Commands	154
DCBX Commands	154
Dynamic Host Configuration Protocol (DHCP)	187
Overview	187
Commands to Configure the System to be a DHCP Server	187
Commands to Configure the System to be a DHCP Client	194
Other Commands supported by DHCP Client	195
Commands to Configure Secure DHCP	198
FIP Snooping	205
Overview	205
GARP VLAN Registration (GVRP)	217
Commands	217
Important Points to Remember	218
Internet Group Management Protocol (IGMP)	227
IGMP Snooping Commands	227
Important Points to Remember for IGMP Snooping	227
Important Points to Remember for IGMP Querier	228
Interfaces	235
Overview	235
Basic Interface Commands	235
Port Channel Commands	277
Time Domain Reflectometer (TDR)	284
Important Points to Remember	284
UDP Broadcast	286
Important Points to Remember	286
IPv4 Routing	289
Commands	289
iSCSI Optimization	323
Overview	323
Link Aggregation Control Protocol (LACP)	331
Overview	331
Commands	331
Layer 2	337
Overview	337
MAC Addressing Commands	337
Virtual LAN (VLAN) Commands	347
Link Layer Discovery Protocol (LLDP)	355
Overview	355
Commands	355
LLDP-MED Commands	363
Multiple Spanning Tree Protocol (MSTP)	371
Overview	371
Commands	371
Open Shortest Path First (OSPFv2)	385
Overview	385
OSPFv2 Commands	385
Port Monitoring	433
Overview	433
Commands	433
Important Points to Remember	433
Private VLAN (PVLAN)	439
Commands	439
Private VLAN Concepts	440
Per-VLAN Spanning Tree Plus (PVST+)	449
Overview	449
Commands	449
Quality of Service (QoS)	461
Overview	461
Global Configuration Commands	461
Per-Port QoS Commands	462
Policy-Based QoS Commands	467
Routing Information Protocol (RIP)	491
Overview	491
Commands	491
Remote Monitoring (RMON)	507
Overview	507
Commands	507
Rapid Spanning Tree Protocol (RSTP)	519
Overview	519
Commands	519
Security	531
Commands	531
AAA Accounting Commands	531
Authorization and Privilege Commands	534
Authentication and Password Commands	537
RADIUS Commands	548
TACACS+ Commands	552
SSH Server and SCP Commands	555
Secure DHCP Commands	566
sFlow	571
Overview	571
Important Points to Remember	571
Commands	572
Simple Network Management Protocol (SNMP) and Syslog	579
Overview	579
SNMP Commands	579
Important Points to Remember	580
Syslog Commands	594
Storm Control	605
Overview	605
Commands	605
Important Points to Remember	605
Stacking Commands	611
Overview	611
Commands	611
Spanning Tree Protocol (STP)	621
Overview	621
System Time and Date	631
Overview	631
Commands	631
Uplink Failure Detection (UFD)	645
Overview	645
Commands	645
VLAN Stacking	655
Overview	655
Important Points to Remember	655
Virtual Router Redundancy Protocol (VRRP)	663
IPv4 VRRP Commands	663
Debugging and Diagnostics	675
Offline Diagnostic Commands	675
Important Points to Remember	675
Buffer Tuning Commands	677
Hardware Commands	682
Internet Control Message Protocol (ICMP) Message Types	695
SNMP Traps	697
Index	701

Match case Limit results 1 per page

IPv4 Routing

301

Commands

ip helper-address

Specify the address of a DHCP server so that DHCP broadcast messages can be forwarded when the

DHCP server is not on the same subnet as the client.

Syntax

ip helper-address

ip-address

To remove a DHCP server address, use the

no ip helper-address

command.

Parameters

Defaults

Not configured.

Command Modes

INTERFACE

Command

History

Usage

Information

You can add multiple DHCP servers by entering the

ip helper-address

command multiple times. If

multiple servers are defined, an incoming request is sent simultaneously to all configured servers and

the reply is forwarded to the DHCP client.

FTOS uses standard DHCP ports, that is UDP ports 67 (server) and 68 (client) for DHCP relay

services. It listens on port 67 and if it receives a broadcast, the software converts it to unicast, and

forwards to it to the DHCP-server with source port=68 and destination port=67.

The server replies with source port=67, destination port=67 and FTOS forwards to the client with

source port=67, destination port=68.

ip helper-address hop-count disable

Disable the hop-count increment for the DHCP relay agent.

Syntax

ip helper-address hop-count disable

To re-enable the hop-count increment, use the

no ip helper-address hop-count disable

command.

Defaults

Enabled; the hops field in the DHCP message header is incremented by default

Command Modes

CONFIGURATION

Command

History

Usage

Information

This command disables the incrementing of the hops field when boot requests are relayed to a DHCP

server through FTOS. If the incoming boot request already has a non-zero hops field, the message will

be relayed with the same value for hops. However, the message is discarded if the hops field exceeds

16, to comply with the relay agent behavior specified in RFC 1542.

ip domain-list

Configures additional names.

ip-address

Enter an IP address in dotted decimal format (A.B.C.D).

Version 8.3.16.1

Introduced on MXL 10/40GbE Switch IO Module

Version 8.3.16.1

Introduced on MXL 10/40GbE Switch IO Module