What i understand is you've four BNG and 3 interfaces in each BNG. All the three interfaces has same VLAN.
You've radius authentication under the dhcp-local-server hirarchy.
Please let me know if understanding is correct?
We'll test in lab and confirm the behavior. Discover packet causes 4x3 radius request or 4x1 radius request.
I tested using one BNG and 4 interfaces. I see BNG is receiving 4 Discover but BNG is sending only one offer and only authentication request sent to radius.
labroot@jtac-mx480-r2046> show dhcp server statisticsPackets dropped:Total 0
Offer Delay:DELAYED 0INPROGRESS 0TOTAL 0
Messages received:BOOTREQUEST 8DHCPDECLINE 0DHCPDISCOVER 4DHCPINFORM 0DHCPRELEASE 0DHCPREQUEST 4DHCPLEASEQUERY 0DHCPBULKLEASEQUERY 0
Messages sent:BOOTREPLY 2DHCPOFFER 1DHCPACK 1DHCPNAK 0DHCPFORCERENEW 0DHCPLEASEUNASSIGNED 0DHCPLEASEUNKNOWN 0DHCPLEASEACTIVE 0DHCPLEASEQUERYDONE 0
labroot@jtac-mx480-r2046> show network-access aaa statistics authenticationAuthentication module statisticsRequests received: 1Accepts: 1Rejects: 0Challenges: 0Timed out requests: 0
Thank you rahul for the clarification. I got similar kind of show output where i can see lesser number of request compared to message received.
# run show dhcp server statisticsPackets dropped:Total 1958125Authentication 1945519TTL expired 3No binding found 12579dhcp-service total 24
Messages received:BOOTREQUEST 3217568DHCPDECLINE 0DHCPDISCOVER 3092513DHCPINFORM 0DHCPRELEASE 2350DHCPREQUEST 122705DHCPLEASEQUERY 0DHCPBULKLEASEQUERY 0
Messages sent:BOOTREPLY 176567DHCPOFFER 87943DHCPACK 55202DHCPNAK 33422DHCPFORCERENEW 0DHCPLEASEUNASSIGNED 0DHCPLEASEUNKNOWN 0DHCPLEASEACTIVE 0DHCPLEASEQUERYDONE 0Packets forwarded:Total 802BOOTREQUEST 0BOOTREPLY 802