Dhcp snooping cisco 2960. 2 lease 4 ip dhcp snooping ip dhcp-server 192.
Dhcp snooping cisco 2960. DHCP also helps conserve the limited IP address space because IP addresses no longer need to be permanently assigned to hosts; only those hosts that are connected to the network consume A non-DHCP snooping VLAN, and the SVI of the non-DHCP snooping VLAN is configured on a device. 255. Aug 31, 2012 · Hi all, I'm actually not very knowledgeable about switches, but I've tried to find a solution to my problem in the various manuals and have been unsucessful. My network got use DHCP server (Windows Server 2012 R2) with differences VLAN. I hope someone can advice me about my problem. For the latest caveats and feature information, see Bug Search Tool and the release notes for DHCP snooping acts like a firewall between untrusted hosts and DHCP servers. It is likely the source of our network issues. 2(2)E (Catalyst 2960-X Switch) -Configuring IPv6 First Hop Security Jan 26, 2018 · Hello, We are finding a very high CPU usage on one of our main switches and not seeming to find a reason to explain it. You use DHCP snooping to differentiate between untrusted interfaces connected to the end user and trusted interfaces connected to the DHCP server or another switch. Unless otherwise noted, the term switch refers to a standalone switch and to a switch stack. Can any one help me on this please ? Nov 17, 2007 · A test workstation trying to get dhcp ip is still receiving from the rouge dhcp server. the configuration and the version of the switch are in the file attached. First enable it globally ip dhcp snooping Second add particular vlan ip dhcp snooping vlan vlan_number The switch will ignore any dhcp request for all access ports for enabled vlan 5 Helpful Reply Sep 18, 2008 · The gig ports of the 2960 are all in trunking mode, the fast ethernet ports are all in vlan 2. Sep 11, 2008 · On a LAN I have a CAT3750 in ip routing mode that connects to a 2821 router configured for OSPF routing to jump across a wireless link to another site. When you use DHCP snooping in a service-provider environment, an untrusted message is sent from a device that is not in the service-provider network, such as a customer Jul 10, 2013 · Hi Forum I have made a very simple test setup to check that a rogue DHCP is not allowed to pass out DHCP addresses to clients. DHCP snooping creates… Read More » Category: Cisco Routing Oct 8, 2020 · （1） 登录交换机，输入enable命令进入特权模式，再输入config terminal 进入全局配置模式； （2） 输入ip dhcp snooping（启用dhcp snooping）； （3） 输入errdisable recovery cause dhcp-rate-limit （允许dhcp限制导致端口down掉后重启端口）； （4） 输入errdisable recovery interval 30 （允许在30秒后重启端口）； （5） 输入 Oct 8, 2020 · （1） 登录交换机，输入enable命令进入特权模式，再输入config terminal 进入全局配置模式； （2） 输入ip dhcp snooping（启用dhcp snooping）； （3） 输入errdisable recovery cause dhcp-rate-limit （允许dhcp限制导致端口down掉后重启端口）； （4） 输入errdisable recovery interval 30 （允许在30秒后重启端口）； （5） 输入 Apr 25, 2018 · 2960 (config-if)#ip dhcp snooping trust ##设置其它所属vlan的非信任端口DHCP报文速率为每秒100个包（端口默认是每秒15个包） 2960 (config)#interface range gigabitEthernet 1/0/1-15 2960 (config-if-range)#ip dhcp snooping limit rate 100 ##设置为直接转发 2960 (config-if-range)#spanning-tree portfast ##显示与维护 If you enable IP source guard with source IP and MAC address filtering, DHCP snooping and port security must be enabled on the interface. DHCP Snooping DHCP snooping is a DHCP security feature that provides network security by filtering untrusted DHCP messages and by building and maintaining a DHCP snooping binding database, also referred to as a DHCP snooping binding table. DHCP snooping功能在交换机上被激活后，会 Jan 15, 2022 · Hello, I'm struggling with DHCP snooping, and I can't find any helpful information on the internet. 168. 2 lease 4 ip dhcp snooping ip dhcp-server 192. 17. I'am not sure if it's important or not. Feb 26, 2022 · We use 2960-X switches and want to configure them so no IPv6 traffic can be sent. That traffic is then separated from the rest of the network on layer 3 via a VRF. How much impact it will have on the switch CPU and RAM? How many binding entries can 2960 or 3750 store in Jun 24, 2014 · Security Configuration Guide, Cisco IOS Release 15. Some Catalyst 2950 switch workarounds to address platform limitations (such as the ip igmp snooping source-only-learning global configuration command) are not required on the Catalyst 2960 switch. Even after resetting the switch to factory and uploading new known good switch configuration script is not distributing the correct IP addresses to certain nodes con The DHCP Version 6 (DHCPv6) Snooping feature enhances security by recording IPv6 address obtained by monitoring DHCP messages. Oct 9, 2006 · Hi DHCP server is possible in Cisco 2960 switches, find the configurations below according 2 ur requirement. So, the switch must be configured to trust some interfaces to use DHCP Snooping. 2-SEn. If the SW1 port 1 configure to untru Jan 30, 2014 · In this small blog post, we will take a look at the configuration and behavior of IPv6 Snooping and DHCPv6 Guard. Dec 26, 2020 · I am new to Cisco community. Some of those each have a static IP address Jan 5, 2011 · Scenerio: As part of a tech refresh project at a large campus and due to several issues caused by (l)users plugging in home routers to the network and causing DHCP issues I am looking to enable DHCP snooping. Certainly if the servers are Windows 2003 or earlier then they definitely won't work if this is enabled. The switch uses a source IP lookup table in hardware to bind IP addresses to ports. 55-SEn (actually the SE9) or 15. But snooping is not working and bindings are not getting updated. Jun 22, 2009 · Also, DHCP snooping must be enabled in order to permit ARP packets that have dynamically assigned IP addresses with the ip dhcp snooping command. Catalyst 2960 switch pdf manual download. For the latest caveats and feature information, see Bug Search Tool and the release notes for May 30, 2012 · This chapter describes how to configure DHCP snooping and option-82 data insertion, and the DHCP server port-based address allocation features on the Catalyst switch. that's great however the switch did NOT rep Jan 10, 2018 · Hi Guys, We are in the process of rolling out DHCP Snooping across our access network, we have a pilot site running with no issues, but i'm wondering what this log message means? i can't seem to find anything; Jan 9 21:50:35. I was directed not to reboot the May 1, 2017 · Cisco Community 思科社区 网络 交换讨论区 2960的DHCP Snooping功能可以应用到无VLAN的网络中吗？如何配置？ Apr 18, 2012 · 1 switch catalyst 2960 PST-S,1 server dhcp and 1 pc client,the PC and the server are in VLAN 10,DHCP SNOOPING is enabled in all ports and no port is trusted,but the client get addresse IP after retyping ipconfig /release and ipconfig /renew in dos commande. The SVI of the non-DHCP snooping VLAN is configured with the status of no shutdown. Un-trusted ports are all host ports in a VLAN. HTH Regards, Talha ip dhcp snooping trust, on page 8 ip dhcp snooping verify mac-address, on page 9 ip dhcp snooping vlan, on page 9 ip dhcp snooping vlan information option circuit-id, on page 10 renew ip dhcp snooping database, on page 11 show ip dhcp snooping, on page 11 show ip dhcp snooping binding, on page 12 Aug 11, 2019 · Hello, we are trying to configure our 2960 (C2960-LANBASEK9-M, Version 12. I am using a linksys router, which acts as the rogue DHCP server. Aug 27, 2008 · This chapter describes how to configure DHCP snooping and option-82 data insertion, and the DHCP server port-based address allocation features on the Catalyst 2960 and 2960-S switches. The switch port where the rouge dhcp server is connected ain't configured for "ip dhcp snooping trust" and also it wasn't went into "err-disable" nor see anything in the "ip dhcp snooping bindings" Below is the sample config on the access switch in the lab: ! Cisco Learning NetworkLoading × Sorry to interrupt CSS Error Refresh Jul 6, 2014 · Software Configuration Guide, Cisco IOS Release 15. Dynamic ARP inspection is supported on access ports, trunk ports, EtherChannel ports, and private VLAN ports. Aug 30, 2013 · Solved: Hello to everyone, I have some issue with DHCP snooping on Catalyst 2960. when I issue the command << show ip dhcp snooping binding >> on the 2960 switch, no binding information is displayed. DHCP snooping is not active until DHCP snooping is enabled on a VLAN. This feature allows a network administrator to compare the IPv6 address obtained when the user browses the internet, to the IPv6 addresses in the DHCPv6 server and confirm a user's identity by looking at the MAC address DHCP snooping acts like a firewall between untrusted hosts and DHCP servers. The edge switches all carry guest network traffic on guest vlan 10. To use this feature, first, we have to enable it. Please see the configuration below. which is configure for DHCP snooping. Apr 20, 2009 · Not many DHCP servers support the insertion of Option 82 information so you will probably want to disable this feature: no ip dhcp snooping information option. I've configured IPv6 Snooping and the configuration looks good. So let’s start with IPv6 Snooping: IPv6 Snooping is not a security feature per se. PC 1 get its ip address parameters from the DHCP Server set up on the 2811 cisco router. Nov 6, 2006 · Dear All, We recently rolled out a Catalyst 2970 aggregation switch with 10 Catalyst 2960 access switches connected to it and have run into DHCP snooping problems. 00 storm-control Jul 26, 2013 · Hi, The network dirgram is : dhcp client - ( SW1 port 1 ) - SW1 - ( SW1 port 2 ) - SW2 - dhcp server The SW1 is Catalyst 2960S switch ( WS-C2960S-48TD-L ) with universal image ( c2960s-universalk9-mz. Is there any other solution to block any DHCP packet throught switch without interface or other service outage? Is possi HI Alain, DHCP server is connected through Distribution Layer Switch (3750) [Server farm] and then it connected to Core switch (6500)and then another Distribution Layer Switch which then connected to Access layer switch (3750/2960) where users are residing. 7E) Note that the switches that has to "snoop" and apply the Source-Guard feature are NOT the DHCPv6-Relay. Oct 22, 2011 · Dears I did the DHCP configuration for my CISCO 2960 switch but the clients are still not able to get the IPs. For the latest caveats and feature information, see Bug Search Tool and the release notes for Sep 22, 2011 · Hi, It would be helpful if you post the configuration of 2960 and 6500. DHCP snooping is enabled for VLAN's 1 to 4094 on each of the switches. Each access switches' uplink port as well as all of the link po Feb 14, 2023 · The config of the access port has the commands: ip arp inspection limit rate 100 and ip dhcp snooping limit rate 100 From my understanding, there was a mismatch between the ARP request and the DHCP snooping database, but I cannot understand the reason. Jul 9, 2013 · Hi I am looking at a way to stop rogue DHCP servers effecting a LAN on one of our customers sites and believe DHCP Snooping is the way forward! I have a test switch 2960 with the following spec Switch Ports Model SW Version SW Image ------ ----- ----- Sep 14, 2021 · We have a Cisco 2960 switch that uses DHCP to send specific IP addresses to devices that are connected to specific ports on the 2960. Can you please help ? Thanks, Oct 17, 2016 · Hi, I am a beginner user for Cisco products. We have a hub and spoke topology, with a main core switch connecting to multiple layer 3/distribution switches. These commands are helpful in diagnosing and resolving internetworking problems and should be enabled only under the guidance of Cisco technical support staff. I'm configuring DHCP snooping, and (as far as i know), I've configured it according to the manual. 969 AEST: %DHCP_SNOOPING-6-AGENT_OPERATION_SUCCEEDED: DHCP snooping database Read succeeded. 1 dns-server 192. Try this : 1) Clear DHCP bindings on the DHCP server. So i hope someone here can help. During the tech refresh the access switches will be upgraded first then the core. All ports on the 3750 are in trunking mode. After the reboot, shouldn't the DHCP snooping database be empty and no mismatch occur? Consolidated Platform Configuration Guide, Cisco IOS Release 15. That port is connected to a Wireless Router that has own DHCP Aug 28, 2012 · Tags: DHCP Snooping on Cisco 2960 How to Configure DHCP Snooping? Posted on August 28, 2012 by RouterSwitch Tech | 0 Comments This chapter describes how to configure DHCP snooping and option-82 data insertion, and the DHCP server port-based address allocation features on the Catalyst 2960, 2960-S, or 2960-C switch. When configuring a large number of circuit IDs on a device, consider the impact of lengthy Feb 10, 2023 · I want to be certain about ip dhcp snooping configuration on a Cisco 2960 switch (in Packet Tracer) Is it true that ip dhcp snooping will disable all dhcp traffic on all the switchports of a 2960 PacketTracer switch? So if that is true, enabling ip dhcp snooping trust on a switchport, will allow dhc Sep 21, 2011 · Hi, You have DHCP snooping and DAI configured indeed: ip dhcp snooping vlan 2-95 ip dhcp snooping ip name-server ip arp inspection vlan 2-95 So do like Talha said and also clear the ip dhcp snooping binding database: clear ip dhcp snooping database Regards. On other VLAN's it is working. each switch has a subinterface of the router This appendix describes the debug privileged EXEC commands that have been created or changed for use with the Catalyst 2960 and 2960-S switch. Sep 29, 2022 · DHCP snooping acts like a firewall between untrusted hosts and DHCP servers. 50. But now my DHCP won't work anymore (DHCP request failed on end de Oct 17, 2011 · This chapter describes how to configure Dynamic Host Configuration Protocol (DHCP) snooping on a Cisco NX-OS device. 2(2)E (Catalyst 2960, 2960-S, 2960-SF and 2960-Plus Switches) -Configuring System Message Logging and Smart Logging Mar 6, 2019 · Hi experts, After two days straight lab I think I have figured out how DHCP snooping works. You must also enter the ip dhcp snooping information option global configuration command and ensure that the DHCP server supports option 82. Apr 23, 2021 · DHCP snooping acts like a firewall between untrusted hosts and DHCP servers. i have a scenario where i have around 50 L2 cisco 2960 switches all connected through thier trunks ans all tat end on a L3 3750x switch where we have a dhcp server for allocating Finding Feature Information Prerequisites for Configuring DHCP Snooping and Option 82 Port-Based Address Allocation Configuration Guidelines Feature Information for DHCP Snooping and Option 82 Finding Feature Information Your software release may not support all the features documented in this module. DHCP snooping is a DHCP security feature that provides network security by filtering untrusted DHCP messages and by building and maintaining a DHCP snooping binding database, also referred to as a DHCP snooping binding table. It builds a database table of IPv6 neighbors connected to the device created from information sources such as NDP snooping or DHCPv6. I am administering a Catalyst 2960S switch and I would like to connect several computers to it. After enabling, we can configure it on some VLANs or all VLANs. Mar 24, 2013 · Hi all, i am trying to block all dhcp packets throught 2960S lan base IOS. ip dhcp pool test network 192. 2 (50)SE4) with DHCP snooping on ports, the configuration on ASW is: ip dhcp snooping ip dhcp snooping vlan 2,3 ip dhcp snooping information option allow-untrusted interfaces which connect users: interface FastEthernet0/2 switchport access vlan 2 switchport mode access switchport port-security maximum 4 switchport port I have a problem with Dhcp of some the Vlans. An IOS router connected to the uplink port acts as the trusted DHCP server. Configuring DHCP Snooping, Default DHCP Snooping Configuration, DHCP Snooping Configuration Guidelines, Configuring the DHCP Relay Agent , Enabling DHCP Snooping and Option 82, Enabling the DHCP Snooping Binding Database Agent. DHCP snooping技术 ①. 3 you can also know the dhcp server status by show ip dhcp binding Mar 20, 2021 · Hi! Your PCs can get IP address from a DHCP server (R1), however the Cisco Packet Tracer software has bugs in the DHCP snooping feature: 2960 Switch => DHCP snooping only operate in one vlan (it could have issues in more vlans) 3560 Switch => DHCP snooping doesn't operate correctly Check the CLN cases Apr 13, 2011 · hi, I put ip dhcp snooping in 2950 switchs, it works like a charm ip dhcp snooping ip dhcp snooping vlan 10 ip dhcp snooping trust on interface trunk I did the same on 2960 switchs ( ios 12. It releases DHCP IPs to hosts. Don't forget to rate helpful posts. Recently we ran into bug CSCuj03351 ('DHCP discover packets not forwarded on 2960S'), which is a duplicate of of bug CSCui65252 ('ARP packets processing stops when DAI is e Aug 12, 2010 · When DHCP snooping is disabled or in non-DHCP environments, use ARP ACLs to permit or to deny packets. here is how my network is : I have a router ASR1001, which connects 15 switches(2960) as a ring topology. 122-55. Following is my configuration. 00 storm-control This chapter describes how to configure DHCP snooping and option-82 data insertion, and the DHCP server port-based address allocation features on the Catalyst 2960 and 2960-S switches. It validates the DHCP messages received from un-trusted ports and filter out the invalid messages. 53 lanlite) and there is nothing in ip dhcp snnoping binding table did i forgot something? thanx. 0. This chapter describes how to configure DHCP snooping and option-82 data insertion, and the DHCP server port-based address allocation features on the Catalyst 2960 and 2960-S switches. (TC-gig fiber & gig ethernet, TT-gig ehternet only). Apr 30, 2008 · 04-30-2008 12:08 AM use ip dhcp snooping for particular vlan that you want to filter. Our switches have C2960S-UNIVERSALK9-M image but it seems that ip helper is not there. We have many of these switches in use, but only this one in particular is giving us problems. It also describes how to configure the IP source guard feature. Sep 28, 2016 · DHCP snooping acts like a firewall between untrusted hosts and DHCP servers. SE7 ). I want to block the DHCP server for certain port in Cisco 2960X. An untrusted DHCP message is a message that is received through an untrusted interface. 2. 使用DHCP snooping，管理员可以指派交换机的端口为信任或非信任端口 交换机不会将接收到的DHCP Discover报文向非信任端口转发 交换机只会将接收到DHCP Offer和Ack报文向接收到DHCP请求的接口转发 ②. com default-router 192. I'am testing it on 2 kind of devices : Cisco Catalyst 2960-X (IOS 15. Everything was working fine until one day, I found out that clients in vlan 2 were getting dhcp info from outside the vlan 2 ip subnet. Snooping policy applied to "user Apr 25, 2022 · This section describes the restrictions for DHCP Snooping and Option 82: The DHCP option-82 feature is supported only when DHCP snooping is globally enabled and on the VLANs to which subscriber devices using this feature are assigned. I would like to implement DHCP snooping in our company's network to restrict rogue DHCP server, before implementation I would like to have your valuable thoughts and suggestions on below provided infrastructure details. com (config)#pool test (config-if)#client client-id vlan 500 (config-if)#ip dhcp snooping trust Please advise. Refer to the Enabling Additional Validation section of Configuring Dynamic ARP Inspection in order to enable additional validation on the destination MAC address, the sender and target IP addresses . Apr 21, 2011 · hi, I put ip dhcp snooping in 2950 switchs, it works like a charm ip dhcp snooping ip dhcp snooping vlan 10 ip dhcp snooping trust on interface trunk I did the same on 2960 switchs ( ios 12. May 30, 2012 · This chapter describes how to configure DHCP snooping and option-82 data insertion, and the DHCP server port-based address allocation features on the Catalyst 2960, 2960-S, or 2960-C switch. DHCP snooping acts like a firewall between untrusted hosts and DHCP servers. Dec 30, 2016 · Hi, I need to configure ip helper address to use a dhcp server that is on a different vlan than clients. View and Download Cisco Catalyst 2960 command reference manual online. We tried to enable the dhcp snooping feature. Apr 29, 2022 · DHCP snooping is enabled on vlans 11, 12, 13. Configuring DHCP Features This chapter describes how to configure DHCP snooping and the option-82 data insertion features on the Catalyst 2960 switch. Mar 20, 2014 · I set up a simple lab and enabled dhcp snooping PC1---F0/1--SWITCH--F0/24---DHCP Server I added 'trust' under f0/24 and pc received an ip address, there was a dhcp snooping binding. DHCP snooping is configured globally as follows : ip dhcp snooping vlan 11, 12, 13 ip dhcp snooping Gi0/1 : switchport access vlan 10 switchport mode access Po1 : switchport trunk allowed vlan 10-15 switchport mode trunk switchport nonegotiate storm-control broadcast level 6. 5 days ago · Examples of Cisco Catalyst switches that support DHCP Snooping are: Cisco Catalyst 2960S, 2960-X, 3560, 3750, 3750-X, 3850, 4500, 6500, 9300, 9400 and 9500 series. Alain. . Apr 17, 2025 · By using this feature, we can mitigate several security risks caused by rogue DHCP servers and attackers. Sep 12, 2011 · As the 2960 Catalysts support DHCP Snooping, IP Source Guard and Dynamic ARP Inspection in recent IOSes, I would personally vouch for DHCP Snooping + IP Source Guard. I think you have DHCP and Dynamic Arp Inspection enabled right on 6500. 2 E7) Cisco 4500-E Sup7 (IOS-XE 3. We don't use IPv6 and want to drop all traffic to help mitigate security vulnerabilities associated with it. Apr 11, 2020 · 本帖最后由 碧云天 于 2020-4-17 23:26 编辑 一. I also want to know where I have to block rouge server !! On access layer host port or on core or DHCP Distribution swithc port?? Regards Hi, I'am struggling with IPv6 Source Guard. Jan 23, 2016 · Hello everyone . In this scenario, the DHCP packets in the non-DHCP snooping VLAN are not forwarded to the trusted ports. How would I go about doing that? Apr 17, 2025 · This tutorial explains how to configure, test, and verify DHCP Snooping on Cisco switches through a packet tracer example. Jan 11, 2008 · Multicast The multicast forwarding decisions on the Catalyst 2960 switch are based on IP addresses. Connected to t DHCP snooping acts like a firewall between DHCP servers and un-trusted host/ports. Cascaded to these 2960TC's using the gig ports are 1 or 2 2960TT's. Hello, we have a lot of C2960, C2960S, C3750, C3750X and C3560 running either IOS 12. Trusted ports are ports connected to router, switch and server. Jun 16, 2023 · DHCP snooping acts like a firewall between untrusted hosts and DHCP servers. 0 255. I'm about to implement it at the customer networks but before that I need advice from you guys: 1. I've also attached example network/topology diagram for the better understanding of provided details. Sep 9, 2006 · Solved: I've just noticed that DHCP snooping is not working on some VLAN's on a bunch of Cisco 2960's I've just deployed. Configure login # Configure terminal # Username admin privilege 15 secret adminadmin # aaa new-model # enable secret adminadmin 2 Jul 9, 2022 · In this article, we take a look at the configuration steps for deploying DHCP Snooping and IP Device Tracking on access ports and trunk ports on Cisco IOS switches. 2) Change the Voice VLAN. By default, the switch considers all interfaces untrusted. I removed 'trust', release an ip from the pc and pc did not get an ip. The new a Mar 7, 2019 · I have enabled both DHCP service and DHCP snooping in 2960 switch. Understanding DHCP Snooping DHCP is widely used in LAN environments to dynamically assign host IP addresses from a centralized server, which significantly reduces the overhead of administration of IP addresses. Jul 6, 2014 · Finding Feature Information Prerequisites for Configuring DHCP Snooping and Option 82 Port-Based Address Allocation Configuration Guidelines Feature Information for DHCP Snooping and Option 82 Finding Feature Information Your software release may not support all the features documented in this module. The 3750 has two vlans: 1 and 2. Also, the 3750 is configured as a dhcp server on vlan 2. 2 (3)E and Later (Catalyst 2960-X Switches) -Configuring DHCP • DHCP snooping is not active until DHCP snooping is enabled on a VLAN. All traffic is taking place View and Download Cisco Catalyst 2960 command reference manual online. Dec 1, 2023 · ip dhcp snooping vlan 20 no ip dhcp snooping information option ip dhcp snooping ip arp inspection vlan 20 ip arp inspection vlan 20 logging acl-match matchlog ip arp inspection vlan 20 logging dhcp-bindings all interface GigabitEthernet3/0/9 switchport access vlan 20 switchport mode access ip arp inspection limit rate 120 ip access-group ACL Catalyst 2960 and 2960-S Switch Debug Commands This appendix describes the debug privileged EXEC commands that have been created or changed for use with the Catalyst 2960 and 2960-S switch. 3) Clear ARP on 6500. DHCP snooping works on a per-VLAN basis. 3 interface vlan 1 ip address 192. 0/16 Sep 29, 2022 · After IPSG is enabled on an interface, the switch blocks all IP traffic received on the interface except for DHCP packets allowed by DHCP snooping. Jan 30, 2014 · In this small blog post, we will take a look at the configuration and behavior of IPv6 Snooping and DHCPv6 Guard. 0 domain-name cisco. But when i set no trust interface for dhcp snooping, the dhcp packet source port will be err-disabled. 概述 1. Finding Feature Information Prerequisites for Configuring DHCP Snooping and Option 82 Port-Based Address Allocation Configuration Guidelines Feature Information for DHCP Snooping and Option 82 Finding Feature Information Your software release may not support all the features documented in this module. By default, this feature is not enabled. The template that was used to configure the switches has the lines: ip dhcp snooping vlan 1-4094 Equipment used Two Switches (3750 as DHCP server and 2960 as the DHCP snooping switch) One PC client with Windows 7 OS with VM Backtrack Linux 5 R3 Topology (the drawing here does not show the actual switch model) Steps and Configuration SWITCH_DHCP_SERVER 1. i am a bit confused as how to use and implement dhcp snooping with ip souce guard and port security . The dhcp scope for vlan 2 is 172. 6. (config)#ip dhcp database cisco. j1ofaziehrrq6i27zcvtbz8jtoamykcioufu9wcc