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dhcp superscope

Posted on 2014-03-28
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Last Modified: 2014-04-08
I have a dhcp server that goes to a switch to a remote location.  The remote switch is using bootp relay. As it stands now everything is working. I needed to add a new vlan to my switch so that my traffic is tagged on switch prior going to a router, that is acting as a bridge. The ISP limits the number of mac address being on their arp table of the router.
I need to know how to create another dhcp superscope that would use both the 192.168.2.0 and the new subnet of 192.168.5.0
I have attached a print screen of the dhcp scope
I have phones and thin clients that share a cable, where the phone acts a bridge so two devices are going into one port on the switch.  I want to be able to have specific ports on the switch to be tagged for the new vlan 192.168.5.0 but also have other ports still use dhcp for 192.168.2.0 aswell, but not tag those ports, and remain in the default vlan.
ScreenShot730.jpg
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Question by:jim3725
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Expert Comment

by:Gareth Gudger
ID: 39962794
What kind of router of switch do you have at your remote site?

Most routers will allow you to create sub-interfaces. On each of those sub-interfaces you would assign an IP. One sub-interface/IP would be the default gateway for the 2.x network and the other sub-interface/IP would be the default gateway for the 5.x network.

Then assign each sub-interface to a different VLAN. Then assign the necessary switch ports to the VLAN you need. Any DHCP requests coming through that switch-port will be tagged with that VLAN ID, will broadcast DHCP to the sub-interface of the router on that same VLAN, which will then use an IP helper to talk to your DHCP server. That server will see that request came from either the 5.x or 2.x gateway and assign a 2.x or 5.x IP back to the IP helper, which turns it around to the device which initiated that request.

The scope for 5.x and 2.x remain separate on the DHCP server.

The other possibility is the phone. I know some phones that do this bridging, such as the ShoreTel's, will boot up, get a DHCP address from primary subnet. There will be a special DHCP option in the scope that only the ShoreTels can read. It will tell the phone to reboot and to tag the phone itself with a specific VLAN. The phone reboots under the new VLAN and gets a new IP from the new subnet. The beauty of this is that your switch ports can remain in the default VLAN, or, a PC VLAN. So you never have to VLAN tag the switch ports. To the switch everything is operating off the default or PC VLAN. The PC is bridged through the ShoreTel on one VLAN, while the phone operates on a separate VLAN.
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Author Comment

by:jim3725
ID: 39968203
I created the superscope for both vlan subnets. The pc's worked as expected.
The avaya 4612 phones were not able to get an ipaddress from the new vlan
The dhcp scope for subnet 192.168.5.0 has the bootp and dhcp options.
I have put in the same options for 176 for the avaya ip phone, but  phones can't find the router ip. The port that the switch is in untagged for the 192.168.5.0 subnet,
The pc is plugged into the phone and can get an ip address from subnet 192.168.5.0
The display on the phone was stating that the L2q parameters in option 176 is having a looping condtions.  It also can' t find the router ip address.
If anyone has any insight on avaya 4612 phones using the same vlan as the pc, but not able to get a ipaddress , then please assist.
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Accepted Solution

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jim3725 earned 0 total points
ID: 39971922
I have disabled 802.1q on the avaya phones and this enabled the dhcp offer to be accepted on the dhcp server. As long as the VID=0 and that the Please confer that the  switche can do the the following:
Accepted VID 0 for the native VLAN when 802.1Q trunking was disabled
on the port.
THen this will not degrade any qos, since the priority will take place on the avaya phone.
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Author Closing Comment

by:jim3725
ID: 39985530
troubleshooting the issue, and confirmation from vendor support, provided the solution
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