https://community.extremenetworks.com/t5/extremeswitching-exos-switch/supervlan-and-needless-dhcp-requests/m-p/50395#M13520 The whole address range from supervlan is permitted for using in subvlans. Client can get any ip address. Which restriction do you mean? <BR /> <BR /> We don't use dhcp snooping on extreme. <BR /> When we tried to add ipaddress to subvlans we got message: “Sub-VLAN test-su-1 cannot be configured with IP address”. <BR /> <BR /> Thank you.<BR /> <BR /> Mon, 15 May 2017 17:03:00 GMT Victor_Vit 2017-05-15T17:03:00Z https://community.extremenetworks.com/t5/extremeswitching-exos-switch/supervlan-and-needless-dhcp-requests/m-p/50384#M13509 Hello.<BR /> <BR /> If I use separate vlans on Extreme X450-24 ver. 15.3.5.2 with bootprelay, DHCP works fine for my client-device. At first there are DhcpDiscover,DhcpOffer,DhcpRequest and DhcpAck and than there are one DhcpRequest + one DhcpAck during right time-period. All right.<BR /> <BR /> But if I begin to use supervlan, the situation is changed. My device sends one DhcpRequest but receives 2 replays. <BR /> <BR /> Scheme:<BR /> client-device &lt;-&gt; switch &lt;-&gt; extreme witch supervlan and bootprelay &lt;-&gt; DHCP server<BR /> <BR /> When I have mirrored traffic between switch and extreme I have seen so situation (by tcpdump):<BR /> 17:20:51.442246 IP client_ip.68 &gt; dhcp_server_ip.67: BOOTP/DHCP, Request from e8:94:f6:53:cf:45, length 548<BR /> 17:20:51.442803 IP dhcp_server_ip.67 &gt; client_ip.68: BOOTP/DHCP, Reply, length 300<BR /> 17:20:51.443525 IP dhcp_server_ip.67 &gt; client_ip.68: BOOTP/DHCP, Reply, length 300<BR /> <BR /> When I have mirrored traffic between extreme and DHCP server I have seen other situation (by tcpdump):<BR /> 16:08:21.422645 IP client_ip.bootpc &gt; dhcp_server_ip.bootps: BOOTP/DHCP, Request from e8:94:f6:53:cf:45, length 548<BR /> 16:08:21.423216 IP dhcp_server_ip.bootps &gt; client_ip.bootpc: BOOTP/DHCP, Reply, length 300<BR /> 16:08:21.423477 IP client_ip.bootpc &gt; dhcp_server_ip.bootps: BOOTP/DHCP, Request from e8:94:f6:53:cf:45, length 548<BR /> 16:08:21.424140 IP dhcp_server_ip.bootps &gt; client_ip.bootpc: BOOTP/DHCP, Reply, length 300<BR /> <BR /> So, after extreme we have duplicate of DhcpRequest packet. <BR /> I think extreme makes it. Why does it make this?<BR /> <BR /> I have used also dhcpdump on DHCP server, but both Requests are identical<BR /> <BR /> How can I fix this situation?<BR /> <BR /> Thank you. <BR /> Thu, 11 May 2017 19:59:00 GMT https://community.extremenetworks.com/t5/extremeswitching-exos-switch/supervlan-and-needless-dhcp-requests/m-p/50384#M13509 Victor_Vit 2017-05-11T19:59:00Z https://community.extremenetworks.com/t5/extremeswitching-exos-switch/supervlan-and-needless-dhcp-requests/m-p/50385#M13510 try to disable bootprelay and see how it changes Thu, 11 May 2017 20:04:00 GMT https://community.extremenetworks.com/t5/extremeswitching-exos-switch/supervlan-and-needless-dhcp-requests/m-p/50385#M13510 Nick_Yakimenko 2017-05-11T20:04:00Z https://community.extremenetworks.com/t5/extremeswitching-exos-switch/supervlan-and-needless-dhcp-requests/m-p/50386#M13511 I made it, but this could not help me.<BR /> Thu, 11 May 2017 20:04:00 GMT https://community.extremenetworks.com/t5/extremeswitching-exos-switch/supervlan-and-needless-dhcp-requests/m-p/50386#M13511 Victor_Vit 2017-05-11T20:04:00Z https://community.extremenetworks.com/t5/extremeswitching-exos-switch/supervlan-and-needless-dhcp-requests/m-p/50387#M13512 Disable communication between your subvlan under your supervlan. ARP will be block/<BR /> <BR /> #disable subvlan-proxy-arp vlan all<BR /> Thu, 11 May 2017 20:28:00 GMT https://community.extremenetworks.com/t5/extremeswitching-exos-switch/supervlan-and-needless-dhcp-requests/m-p/50387#M13512 Mel78__CISSP__E 2017-05-11T20:28:00Z https://community.extremenetworks.com/t5/extremeswitching-exos-switch/supervlan-and-needless-dhcp-requests/m-p/50388#M13513 It doesn't help too.<BR /> Thu, 11 May 2017 20:28:00 GMT https://community.extremenetworks.com/t5/extremeswitching-exos-switch/supervlan-and-needless-dhcp-requests/m-p/50388#M13513 Victor_Vit 2017-05-11T20:28:00Z https://community.extremenetworks.com/t5/extremeswitching-exos-switch/supervlan-and-needless-dhcp-requests/m-p/50389#M13514 Hello, Viktor!<BR /> <BR /> Actually you describing of you config/topology - I don't understand.<BR /> <BR /> Can you, please, show supervlan and bootprelay configuration.<BR /> And also scheme with pointed ports, vlans/subvlans/supervlans.<BR /> <BR /> Also - can it be loop in your scheme? <BR /> <BR /> Thank you! Mon, 15 May 2017 17:03:00 GMT https://community.extremenetworks.com/t5/extremeswitching-exos-switch/supervlan-and-needless-dhcp-requests/m-p/50389#M13514 Alexandr_P 2017-05-15T17:03:00Z https://community.extremenetworks.com/t5/extremeswitching-exos-switch/supervlan-and-needless-dhcp-requests/m-p/50390#M13515 Hello, Alexandr. <BR /> <BR /> Client 's device (TP-link wr740n or Windows 7) is connected to management switch. Client's vlan (one of subvlans on 450) is untagged on client's port and on port that this switch is connected to extreme 450. On extreme 450 there are 2 subvlans in 1 supervlan. <BR /> Bootprelay is on in all vlans. (when I off bootprelay — It didn't make any effect ). <BR /> This 450 is connected by ospf with extreme 650. <BR /> On 650 bootprelay is also on in vlan with it 450 and 650 are connected, and 650 has direct interface(separate vlan with bootprelay) to DHCP server. <BR /> <BR /> Supervlan on 450 <BR /> create vlan "SU" <BR /> configure vlan SU ipaddress *.*.*.1 255.255.255.128 <BR /> enable ipforwarding vlan SU <BR /> configure vlan SU add secondary-ipaddress *.*.*.129 255.255.255.128 <BR /> configure vlan "SU" add subvlan "test-su-2" <BR /> configure vlan "SU" add subvlan "test-su-1" <BR /> enable bootprelay vlan SU <BR /> configure ospf add vlan SU area 0.1.1.1 passive <BR /> <BR /> Bootprelay: <BR /> configure bootprelay add *.*.*.* vr VR-Default <BR /> enable bootprelay vlan SU <BR /> enable bootprelay vlan km (vlan to 650) <BR /> enable bootprelay vlan test-su-1 <BR /> enable bootprelay vlan test-su-2<BR /> <BR /> Mon, 15 May 2017 17:03:00 GMT https://community.extremenetworks.com/t5/extremeswitching-exos-switch/supervlan-and-needless-dhcp-requests/m-p/50390#M13515 Victor_Vit 2017-05-15T17:03:00Z https://community.extremenetworks.com/t5/extremeswitching-exos-switch/supervlan-and-needless-dhcp-requests/m-p/50391#M13516 What address range is using in subvlan?<BR /> <BR /> Thank you! Mon, 15 May 2017 17:03:00 GMT https://community.extremenetworks.com/t5/extremeswitching-exos-switch/supervlan-and-needless-dhcp-requests/m-p/50391#M13516 Alexandr_P 2017-05-15T17:03:00Z https://community.extremenetworks.com/t5/extremeswitching-exos-switch/supervlan-and-needless-dhcp-requests/m-p/50392#M13517 I'm sorry, but I didn't understand your question. What do you mean by “address range in subvlan”? Please, explain it. <BR /> We have such ranges in supervlan: <BR /> configure vlan SU ipaddress *.*.*.1 255.255.255.128 <BR /> configure vlan SU add secondary-ipaddress *.*.*.129 255.255.255.128 <BR /> I'm sorry, but we don't want to show our real ip for all. <BR /> <BR /> Thank you! Mon, 15 May 2017 17:03:00 GMT https://community.extremenetworks.com/t5/extremeswitching-exos-switch/supervlan-and-needless-dhcp-requests/m-p/50392#M13517 Victor_Vit 2017-05-15T17:03:00Z https://community.extremenetworks.com/t5/extremeswitching-exos-switch/supervlan-and-needless-dhcp-requests/m-p/50393#M13518 Subvlan IP addresses from Supervlan addresses range.<BR /> You take it from main supervlan IP range, or from secondary IP range?<BR /> (because there is restriction)<BR /> <BR /> Thank you! Mon, 15 May 2017 17:03:00 GMT https://community.extremenetworks.com/t5/extremeswitching-exos-switch/supervlan-and-needless-dhcp-requests/m-p/50393#M13518 Alexandr_P 2017-05-15T17:03:00Z https://community.extremenetworks.com/t5/extremeswitching-exos-switch/supervlan-and-needless-dhcp-requests/m-p/50394#M13519 Also:<BR /> dhcp relay work at L3, <BR /> at L2 work dhcp snooping.<BR /> If your subvlans have no IP-addresses - it's can be as a part of issue. (just in theory)<BR /> <BR /> Thank you! Mon, 15 May 2017 17:03:00 GMT https://community.extremenetworks.com/t5/extremeswitching-exos-switch/supervlan-and-needless-dhcp-requests/m-p/50394#M13519 Alexandr_P 2017-05-15T17:03:00Z https://community.extremenetworks.com/t5/extremeswitching-exos-switch/supervlan-and-needless-dhcp-requests/m-p/50395#M13520 The whole address range from supervlan is permitted for using in subvlans. Client can get any ip address. Which restriction do you mean? <BR /> <BR /> We don't use dhcp snooping on extreme. <BR /> When we tried to add ipaddress to subvlans we got message: “Sub-VLAN test-su-1 cannot be configured with IP address”. <BR /> <BR /> Thank you.<BR /> <BR /> Mon, 15 May 2017 17:03:00 GMT https://community.extremenetworks.com/t5/extremeswitching-exos-switch/supervlan-and-needless-dhcp-requests/m-p/50395#M13520 Victor_Vit 2017-05-15T17:03:00Z https://community.extremenetworks.com/t5/extremeswitching-exos-switch/supervlan-and-needless-dhcp-requests/m-p/50396#M13521 I meaned earlier - NOT assign IP address for sub-vlan interface, but divide IP-address range for sub-vlan users "configure vlan vsub1 subvlan-address-range 192.201.3.2 - 192.201.3.6"<BR /> <BR /> Thank you! Mon, 15 May 2017 17:03:00 GMT https://community.extremenetworks.com/t5/extremeswitching-exos-switch/supervlan-and-needless-dhcp-requests/m-p/50396#M13521 Alexandr_P 2017-05-15T17:03:00Z https://community.extremenetworks.com/t5/extremeswitching-exos-switch/supervlan-and-needless-dhcp-requests/m-p/50397#M13522 <BR /> But if we divide IP-address range for sub-vlan, what difference will be between separate vlans and sub-vlans in supervlan? We want to use all ip for all vlans, without dividing pools. We want to divide only broadcast domain with using different vlans.<BR /> Mon, 15 May 2017 17:03:00 GMT https://community.extremenetworks.com/t5/extremeswitching-exos-switch/supervlan-and-needless-dhcp-requests/m-p/50397#M13522 Victor_Vit 2017-05-15T17:03:00Z