CCNP: DHCP and Vlans

Hi Everyone,
What is the relationship between dhcp and vlans. For example, if I try to set a default - router to an ip within a vlan, the switch gives an error and says that the ip in is an vlan. Must dhcp ranges be kept separate from vlan ranges?

Thanks!

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gorebrush

There isn't really a direct relationship between them, only that a DHCP scope should only operate inside one VLAN.

So if VLAN 10 = 192.168.10.0/24 for example, then a DHCP Server should have a physical interface attached to that VLAN servicing that DHCP scope only.

I'm not sure what you are getting at with the question "Must dhcp ranges be kept seperate from vlan ranges?" - a DHCP scope would be inside a VLAN as I state above.

What switch are you talking about? Are you attempting to use a switch as a DHCP server?

Node Man

Hi, yes I am using a 3550 as a dhcp server. My problem is that the switch will not let the dhcp default router ip be within the vlan subnet.

RouteMyPacket

Node Man wrote: »

Hi, yes I am using a 3550 as a dhcp server. My problem is that the switch will not let the dhcp default router ip be within the vlan subnet.

Why don't you post your config? There is no reason why you cannot choose an IP within the segment, you have it configured wrong but we can't guess at your config so post it

Example:

ip dhcp pool TEST
network 192.168.30.0 255.255.255.0
domain-name abc.com
default-router 192.168.30.100
dns-server 4.2.2.2 8.8.8.8