# IP Source Guard (IPSG)

**URL:** https://forum.networklessons.com/t/ip-source-guard-ipsg/5324
**Category:** Lessons Discussion
**Created:** [October 29, 2018, 2:28pm UTC](https://forum.networklessons.com/t/ip-source-guard-ipsg/5324 "2018-10-29T14:28:16Z")
**Posts on this page:** 1
**Showing post:** 3

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### Author: ![lagapidis](https://cdn-forum.networklessons.com/user_avatar/forum.networklessons.com/lagapidis/32/4949_2.png) [@lagapidis](https://forum.networklessons.com/u/lagapidis)
#### Post date: [February 14, 2019, 7:13am UTC](https://forum.networklessons.com/t/ip-source-guard-ipsg/5324/3 "2019-02-14T07:13:32Z")

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Hello Hind

In order for IP source guard to function with a voice VLAN, DHCP snooping must be enabled on that voice VLAN. Take a look at the following documentation from Cisco:

> **[Catalyst 6500 Release 12.2SY Software Configuration Guide - IP Source Guard...](https://www.cisco.com/c/en/us/td/docs/switches/lan/catalyst6500/ios/12-2SY/configuration/guide/sy_swcg/ip_source_guard.html#78545)**
>
> IP Source Guard

> [@rightpoints23](#):
>
> I was trying to use IP source guard for this port but it was failing.

When you say IP Source Guard was failing, what do you mean exactly? If the issue was not DHCP snooping, please elaborate on the behaviour you are encountering and come back and let us know so we can continue troubleshooting.

I hope this has been helpful!

Laz

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