Solved

Cisco Switch - IP Helper command

Posted on 2016-09-16
7
31 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 15

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 15

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
Do You Know the 4 Main Threat Actor Types?

Do you know the main threat actor types? Most attackers fall into one of four categories, each with their own favored tactics, techniques, and procedures.

 
LVL 11

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

What Is Threat Intelligence?

Threat intelligence is often discussed, but rarely understood. Starting with a precise definition, along with clear business goals, is essential.

Join & Write a Comment

Exchange server is not supported in any cloud-hosted platform (other than Azure with Azure Premium Storage).
David Varnum recently wrote up his impressions of PRTG, based on a presentation by my colleague Christian at Tech Field Day at VMworld in Barcelona. Thanks David, for your detailed and honest evaluation!
Get a first impression of how PRTG looks and learn how it works.   This video is a short introduction to PRTG, as an initial overview or as a quick start for new PRTG users.
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…

708 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

Need Help in Real-Time?

Connect with top rated Experts

19 Experts available now in Live!

Get 1:1 Help Now