06-07-2017 09:17 AM - edited 03-08-2019 10:53 AM
i have a stackable 3750 L3 switch working as a core switch, when i create vlan more than vlan 100 and configure a dhcp for this vlan
dhcp is not working
for vlan less than vlan 100 every thing is ok and dhcp is working
i dont know why
is it according to version or liscence or what
for example :- creating van less than 100
vlan 90
name comp
int vlan 90
ip add 192.168.90.5 255.255.255.0
ip dhcp pool comp
network 192.168.50.0 255.255.255.0
dns-server 192.168.12.12
default-router 192.168.90.5
int g3/0/1
no sh
switchport mode access
switchport access vlan 90
spanning-tree portfast
and i connect any device laptop or any device to g3/0/1
dhcp is working
every thing is ok about working of dhcp with all vlan with no. less than 100 but if i use any vlan no. more than 100 ,dhcp is not working but static address with it working
any one can help me
Solved! Go to Solution.
06-07-2017 09:52 AM
Hi
I dont understand the question clearly, please correct me, if you create the vlan 100 and also create a new scope for that vlan, the dhcp will not work, right?
ip dhcp pool comp
network 192.168.50.0 255.255.255.0 <-- Network and default router must be on the same network segment.
dns-server 192.168.12.12
default-router 192.168.90.5
06-07-2017 09:52 AM
Hi
I dont understand the question clearly, please correct me, if you create the vlan 100 and also create a new scope for that vlan, the dhcp will not work, right?
ip dhcp pool comp
network 192.168.50.0 255.255.255.0 <-- Network and default router must be on the same network segment.
dns-server 192.168.12.12
default-router 192.168.90.5
06-07-2017 10:31 AM
first sorry all vlan 90 not 50
the problem is
when u create a vlan less than 100 and configure a dhcp for that vlan
it is working properly
if the vlan no. not the address more than 100 configure dhcp is not working
l3 switch doesn't distribute any addresses using dhcp for that vlan
06-07-2017 10:49 AM
No worries my friend,
Ok if you create the vlan 100, for example:
vlan 100
name TESTING
interface fa0/20
switchport access vlan 100
switchport mode access
no shutdown
interface vlan 100
no shutdown
ip add 192.168.100.1 255.255.255.0
ip dhcp pool VLAN100
network 192.168.100.0 255.255.255.0
default-router 192.168.100.1
dns-server 8.8.8.8 4.4.4.4
ip dhcp excluded-address 192.168.100.1
This configuration does not work for you, right? Have you configured the excluded-address?
06-07-2017 10:51 AM
for vlan no. more than 100 dhcp doesn't work
for vlan no. less than 100 dhcp is ok and working properly
06-07-2017 11:00 AM
thank you,
That not make sense, please try my configuration otherwise it could be a bug.
06-07-2017 10:52 AM
yes correct
06-07-2017 10:53 AM
no excluded address
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