Hi,
there is an issue I observe on a Juniper virtual-chassis made of a pair of EX 4550 switches running by Junos 12.3R11.2.
The environment looks like this:
Windows dhcp-client connected to the virtual-chassis, to the particular routing instance where we have enabled DHCP-relay agent, DHCP snooping, dynamic ARP inspection (DAI) and IP source guard (IPSG).
During the DHCP lease process the dhcp-client requests IP address and switch writes the lease information down to dhcp-snooping table, which then being used for DAI and IPSG. Halfway through the lease period, the DHCP client requests a lease renewal, and the DHCP server extends the lease. The problem I have faced with is that during the renewal procces switch doen't not updates the lease timer in it's dhcp-snooping table. Consequently, after lease timer expires on the switch, DAI starts to drop a traffic generated by the host.
Does anybody had something similar and know how to fix this?