https://community.extremenetworks.com/t5/extremeswitching-exos-switch/cisco-ip-phone-with-ip-s-dhcp-option-82-fail/m-p/16827#M442 <P class="fancybox-image"><span class="lia-inline-image-display-wrapper" image-alt="52e7621ce3664f80a748b066f62f465e_fb6c53b5-e316-4372-9f46-d7ad496e744b.jpg"><img src="https://community.extremenetworks.com/t5/image/serverpage/image-id/1402iFF3421DD86440842/image-size/large?v=v2&amp;px=999" role="button" title="52e7621ce3664f80a748b066f62f465e_fb6c53b5-e316-4372-9f46-d7ad496e744b.jpg" alt="52e7621ce3664f80a748b066f62f465e_fb6c53b5-e316-4372-9f46-d7ad496e744b.jpg" /></span></P><BR /> <BR /> From above that ip phone can't get ip address from dhcp server but if that violation change to none then can get IP address from dhcp server but that dhcp option 82 not appended Fri, 28 Dec 2018 13:59:00 GMT Helpme 2018-12-28T13:59:00Z https://community.extremenetworks.com/t5/extremeswitching-exos-switch/cisco-ip-phone-with-ip-s-dhcp-option-82-fail/m-p/16827#M442 <P class="fancybox-image"><span class="lia-inline-image-display-wrapper" image-alt="52e7621ce3664f80a748b066f62f465e_fb6c53b5-e316-4372-9f46-d7ad496e744b.jpg"><img src="https://community.extremenetworks.com/t5/image/serverpage/image-id/1402iFF3421DD86440842/image-size/large?v=v2&amp;px=999" role="button" title="52e7621ce3664f80a748b066f62f465e_fb6c53b5-e316-4372-9f46-d7ad496e744b.jpg" alt="52e7621ce3664f80a748b066f62f465e_fb6c53b5-e316-4372-9f46-d7ad496e744b.jpg" /></span></P><BR /> <BR /> From above that ip phone can't get ip address from dhcp server but if that violation change to none then can get IP address from dhcp server but that dhcp option 82 not appended Fri, 28 Dec 2018 13:59:00 GMT https://community.extremenetworks.com/t5/extremeswitching-exos-switch/cisco-ip-phone-with-ip-s-dhcp-option-82-fail/m-p/16827#M442 Helpme 2018-12-28T13:59:00Z https://community.extremenetworks.com/t5/extremeswitching-exos-switch/cisco-ip-phone-with-ip-s-dhcp-option-82-fail/m-p/16828#M443 Is the phone getting an ip address in the voice vlan or in the data vlan?<BR /> <BR /> also is the phone expecting tagged traffic or untagged traffic? Sat, 29 Dec 2018 02:59:00 GMT https://community.extremenetworks.com/t5/extremeswitching-exos-switch/cisco-ip-phone-with-ip-s-dhcp-option-82-fail/m-p/16828#M443 Brian_Austin 2018-12-29T02:59:00Z https://community.extremenetworks.com/t5/extremeswitching-exos-switch/cisco-ip-phone-with-ip-s-dhcp-option-82-fail/m-p/16829#M444 That data vlan can get IP address and that option 82 information can found on DHCP server<BR /> CIsco IP Phone use Tag vlan<BR /> so if i use dhcp-snooping with violation action then ip phone can't get any ip address but if don't use violation then it can get IP address but that option 82 information can't found in DHCP Server<BR /> Because User Guide say violation none only monitor role Mon, 31 Dec 2018 11:34:00 GMT https://community.extremenetworks.com/t5/extremeswitching-exos-switch/cisco-ip-phone-with-ip-s-dhcp-option-82-fail/m-p/16829#M444 Helpme 2018-12-31T11:34:00Z