Solved

Cisco Switch - IP Helper command

Posted on 2016-09-16
7
41 Views
Last Modified: 2016-10-09
I have 2 Core Cisco 3650 switches and 5 Access Cisco 3560 switches.
I have IP Helper set up on the Core Switches to allow VLAN access to the DHCP Server.
The Core and Access Switches are connected via uplink trunk ports.
Do I also need to create IP Helper on the Access switches?
0
Comment
Question by:fsaiexpert
7 Comments
 
LVL 16

Accepted Solution

by:
max_the_king earned 251 total points (awarded by participants)
ID: 41801433
Hi,
i believe you do not need to set ip helper address on access switches.
When a PC broadcasts for a DHCP server on a VLAN, the  Switched Virtual Interface of that VLAN will hear and relay it to your DHCP server.
hope this helps
max
0
 

Author Comment

by:fsaiexpert
ID: 41801533
The Core Switch is Layer 3 and the Access Switch are Layer 2.
0
 
LVL 16

Assisted Solution

by:max_the_king
max_the_king earned 251 total points (awarded by participants)
ID: 41801550
it doesn't matter. Layer 3 core switch will do the trick. You can configure an ip interface on access vlan2 switch, the uplink trunk on accss switch will go through the core switch, which will do the trick.
max
0
Windows Server 2016: All you need to know

Learn about Hyper-V features that increase functionality and usability of Microsoft Windows Server 2016. Also, throughout this eBook, you’ll find some basic PowerShell examples that will help you leverage the scripts in your environments!

 
LVL 12

Assisted Solution

by:Bryant Schaper
Bryant Schaper earned 83 total points (awarded by participants)
ID: 41801833
Layer 3 switch on the vlan, or router.
1
 
LVL 57

Assisted Solution

by:Pete Long
Pete Long earned 83 total points (awarded by participants)
ID: 41803051
IP helpers are set where the IP address is set, If you have set the default gateway for that particular network on a routed port, you set it there, if not and the gateway for that network segment is an SVI on a VLAN you set it there (on the VLAN).

Cisco IOS – DHCP Helper (DHCP Relay) – IP-Helper Setup

Pete
1
 
LVL 45

Assisted Solution

by:Craig Beck
Craig Beck earned 83 total points (awarded by participants)
ID: 41807895
IP helpers are only set at layer-3 devices.  Layer-2 devices don't do IP routing, so they're not where you configure layer-3 functions.
1
 
LVL 45

Expert Comment

by:Craig Beck
ID: 41835695
Best answers chosen
0

Featured Post

Windows Server 2016: All you need to know

Learn about Hyper-V features that increase functionality and usability of Microsoft Windows Server 2016. Also, throughout this eBook, you’ll find some basic PowerShell examples that will help you leverage the scripts in your environments!

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

How to set-up an On Demand, IPSec, Site to SIte, VPN from a Draytek Vigor Router to a Cyberoam UTM Appliance. A concise guide to the settings required on both devices
Outsource Your Fax Infrastructure to the Cloud (And come out looking like an IT Hero!) Relative to the many demands on today’s IT teams, spending capital, time and resources to maintain physical fax servers and infrastructure is not a high priority.
Here's a very brief overview of the methods PRTG Network Monitor (https://www.paessler.com/prtg) offers for monitoring bandwidth, to help you decide which methods you´d like to investigate in more detail.  The methods are covered in more detail in o…
This video gives you a great overview about bandwidth monitoring with SNMP and WMI with our network monitoring solution PRTG Network Monitor (https://www.paessler.com/prtg). If you're looking for how to monitor bandwidth using netflow or packet s…

772 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question