Solved

Problems enabling DHCP snooping on WS-C3750G

Posted on 2010-11-24
4
877 Views
Last Modified: 2012-05-10
I'm having problems enabling dhcp snooping on a Core switch(WS-C3750G-12S-S). The DHCP server (Win 2003 std.) is connected to port 2/0/13, and I'm testing with a VMware client connected to the switch (vlan5).

NyCoreswitch#sh ip dhcp snooping
Switch DHCP snooping is enabled.
DHCP snooping is configured on following VLANs:
4-6,9-10,44,340
Insertion of option 82 is disabled
   circuit-id format: vlan-mod-port
    remote-id format: MAC
Option 82 on untrusted port is not allowed
Verification of hwaddr field is enabled
Interface                    Trusted     Rate limit (pps)
------------------------     -------     ----------------
...
GigabitEthernet2/0/13        yes         unlimited
...

Open in new window


What am I missing?

Thanks!
0
Comment
Question by:Spanjis
[X]
Welcome to Experts Exchange

Add your voice to the tech community where 5M+ people just like you are talking about what matters.

  • Help others & share knowledge
  • Earn cash & points
  • Learn & ask questions
  • 3
4 Comments
 
LVL 79

Expert Comment

by:lrmoore
ID: 34210105
Snooping is enabled, and port 2/0/13 is trusted. This is the way it works. It will trust dhcp server on this port.
I assume that it is the only trusted port? If yes, then what is the issue?
0
 

Author Comment

by:Spanjis
ID: 34214530
Hi Irmoore,

This is the only trusted port right now.

I've double-checked the DHCP-server port.

ipconfig-all tells me that this is the DHCP-server:
DHCP-server . . . . . . . . . . . : 172.18.4.53

So the DHCP-server is connected to port Gi2/0/13:
NyCoreswitch#sh arp | include 172.18.4.53
Internet  172.18.4.53             0   000b.cd2f.9afe  ARPA   Vlan4
NyCoreswitch#sh mac-address-table | include 000b.cd2f.9afe
   4    000b.cd2f.9afe    DYNAMIC     Gi2/0/13

Open in new window


But when i enable dhcp-snooping, and run ipconfig /release /renew the client don't get an IP-address.
0
 

Accepted Solution

by:
Spanjis earned 0 total points
ID: 34240630
Embarrassing, the DHCP server had 2 NIC.
0
 

Author Closing Comment

by:Spanjis
ID: 34276736
debug ip dhcp snooping did the trick :) I then found out the DHCP server had 2 NIC's.
0

Featured Post

Easy, flexible multimedia distribution & control

Coming soon!  Ideal for large-scale A/V applications, ATEN's VM3200 Modular Matrix Switch is an all-in-one solution that simplifies video wall integration. Easily customize display layouts to see what you want, how you want it in 4k.

Question has a verified solution.

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

Even if you have implemented a Mobile Device Management solution company wide, it is a good idea to make sure you are taking into account all of the major risks to your electronic protected health information (ePHI).
Most of the applications these days are on Cloud. Cloud is ubiquitous with many service providers in the market. Since it has many benefits such as cost reduction, software updates, remote access, disaster recovery and much more.
After creating this article (http://www.experts-exchange.com/articles/23699/Setup-Mikrotik-routers-with-OSPF.html), I decided to make a video (no audio) to show you how to configure the routers and run some trace routes and pings between the 7 sites…
Internet Business Fax to Email Made Easy - With  eFax Corporate (http://www.enterprise.efax.com), you'll receive a dedicated online fax number, which is used the same way as a typical analog fax number. You'll receive secure faxes in your email, f…

726 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