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DHCP conflict IP issue

Publication Date:  2019-02-26 Views:  66 Downloads:  0
Issue Description

-DHCP server causes conflict issue to the VMs in the VDI system.


Handling Process

-we want to locate this DHCP server in the network.

-This is the topology

-           

-            3x S5700 connected to CE6800 with 3 eth-trunk (9,10,11)

-             Many WIFI routers  which are working  as an DHCP server by default so there are multiple DHCP servers addresses. 

-            Normal case that VMs get IP Internally from VDI system.

-            The issue that some VMs get IP from external DHCP server which causes conflict in IPs to VMs.


Root Cause

- Many WIFI routers  which are working  as DHCP server by default so there are multiple DHCP servers

Solution

-configuring the DHCP snooping on all three S5700 switches

interface Eth-Trunk10      // same on Eth-trunk 9,10
port link-type trunk
port trunk allow-pass vlan 100 200 300 
dhcp snooping trusted
#
interface GigabitEthernet0/0/1 
// same on other interfaces from Gig 0/0/1 to Gig 0/0/48
port link-type access
port default vlan 100
dhcp snooping enable


END