cancel
Showing results for 
Search instead for 
Did you mean: 
cancel
570
Views
0
Helpful
2
Replies

Problem with DHCP snooping\IPSG

starling
Level 1
Level 1

Hello everyone.

 

Have problem with IP Source Guard feature.

Host connecting to network and had ip from DHCP MS server, lease time at first is 1 hour, after about 30min host request additional lease and get lease time - 7 day.

DHCP snooping switched on. When host ask dhcp for the first time, there is an entry in switch snooping base with right lease time 1 hour, but when host ask additional lease, snooping base isnt updating lease time and, when 1hour lease over, IPSG switched on interface.

Problem appears on a few hosts on switch, it isnt global problem. TCP dump from host shows packets with additional dhcp request(after 30 min).

Why switch ignoring additional DHCP packets?

Cat4510R

image cat4500e-universalk9.SPA.03.08.09.E.152-4.E9.bin

2 Replies 2

Hello

Is your IPSG active for ip or ip & mac addressing?

Is there any difference between those puts that are not working correctly and the other ports that do?

Do you have spanning-port fast enabled on the access ports?


Please rate and mark as an accepted solution if you have found any of the information provided useful.
This then could assist others on these forums to find a valuable answer and broadens the community’s global network.

Kind Regards
Paul

Jaderson Pessoa
VIP Alumni
VIP Alumni
Hello,

it is possible to share the current configuration?
Jaderson Pessoa
*** Rate All Helpful Responses ***
Getting Started

Find answers to your questions by entering keywords or phrases in the Search bar above. New here? Use these resources to familiarize yourself with the community: