01-13-2020 12:02 AM
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
01-13-2020 12:54 AM
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?
01-13-2020 02:33 AM
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