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1396
February 15th, 2018 08:00
DHCP Snooping weird behavior between switches
We have a mix of PowerConnect 5524/48 and N2024/48 series switches. When we first enabled DHCP Snooping everything was working as it should. However, after several months we started having problems with legitimate DHCP offers being blocked. At first, we thought the problem was with the local switch, but further investigation showed that the problem was with the upstream switch. We rebooted the upstream switch and DHCP Snooping worked for about two weeks, then the problem returned. We have disabled DHCP Snooping, but was wondering if anyone else has experienced a similar problem. Could the fact that we have a mix of PowerConnect 5500 switches and N2000-series switches be an issue? Any suggestions?
Ken
Dell-JimmyP
311 Posts
0
February 15th, 2018 10:00
Hi Ken,
Please send a private message with your service tag of the N2000 to ensure we have all appropriate information on your system.
Thank you,
Dell-JimmyP
311 Posts
0
February 15th, 2018 13:00
Hi Ken,
Thanks for the service tag.
Where is the DHCP server located and the end device that is unable to get the IP address. Can you please provide show techs from the N2000 & PC5500? Upload to
Homepage: https://fileexchanger.dell.com
Username:
960858226
Password:
CcxNSoIzC7
Thanks
Dell-JimmyP
311 Posts
0
February 16th, 2018 09:00
Hi Ken,
I haven't seen anything jump out in your configurations or logs. One question, is ip dhcp snooping trust enabled on the DHCP server interface?
I suggest updating the firmware, boot code & CPLD. The firmware is way out date and there are several fixes available.
Thank you,