- Community Home
- >
- Networking
- >
- Legacy
- >
- Switches, Hubs, Modems
- >
- DHCP and VLANs
Categories
Company
Local Language
Forums
Discussions
Forums
- Data Protection and Retention
- Entry Storage Systems
- Legacy
- Midrange and Enterprise Storage
- Storage Networking
- HPE Nimble Storage
Discussions
Discussions
Discussions
Forums
Forums
Discussions
Discussion Boards
Discussion Boards
Discussion Boards
Discussion Boards
- BladeSystem Infrastructure and Application Solutions
- Appliance Servers
- Alpha Servers
- BackOffice Products
- Internet Products
- HPE 9000 and HPE e3000 Servers
- Networking
- Netservers
- Secure OS Software for Linux
- Server Management (Insight Manager 7)
- Windows Server 2003
- Operating System - Tru64 Unix
- ProLiant Deployment and Provisioning
- Linux-Based Community / Regional
- Microsoft System Center Integration
Discussion Boards
Discussion Boards
Discussion Boards
Discussion Boards
Discussion Boards
Discussion Boards
Discussion Boards
Discussion Boards
Discussion Boards
Discussion Boards
Discussion Boards
Discussion Boards
Discussion Boards
Discussion Boards
Discussion Boards
Discussion Boards
Discussion Boards
Discussion Boards
Discussion Boards
Discussion Boards
Discussion Boards
Discussion Boards
Community
Resources
Forums
Blogs
- Subscribe to RSS Feed
- Mark Topic as New
- Mark Topic as Read
- Float this Topic for Current User
- Bookmark
- Subscribe
- Printer Friendly Page
- Mark as New
- Bookmark
- Subscribe
- Mute
- Subscribe to RSS Feed
- Permalink
- Report Inappropriate Content
тАО07-18-2007 05:50 AM
тАО07-18-2007 05:50 AM
DHCP and VLANs
- Mark as New
- Bookmark
- Subscribe
- Mute
- Subscribe to RSS Feed
- Permalink
- Report Inappropriate Content
тАО07-18-2007 04:20 PM
тАО07-18-2007 04:20 PM
Re: DHCP and VLANs
- Mark as New
- Bookmark
- Subscribe
- Mute
- Subscribe to RSS Feed
- Permalink
- Report Inappropriate Content
тАО07-19-2007 12:57 AM
тАО07-19-2007 12:57 AM
Re: DHCP and VLANs
You need to configure DHCP-relay functionality on the VLANs. A host connected to an untagged port on a switch will send a broadcast packet (DHCP request). The switch will see this DHCP packet on that VLAN and change it to a unicast packet to the IP-helper address (DHCP-server). The DHCP-server will send a DHCP-offer to the switch which will send the packet to the host on the VLAN requesting it. This assumes, that the DHCP-server are on different subnets. If the DHCP servers reside on the same subnet (VLAN) as the clients, you don't have to do anything. The DHCP-request from the client will stay on the same VLAN (gets tagged on interconnect links)and the DHCP-server will receive the packet and send the offer to the client. For the first scenario, look at the documentation under "DHCP relay".
- Mark as New
- Bookmark
- Subscribe
- Mute
- Subscribe to RSS Feed
- Permalink
- Report Inappropriate Content
тАО07-19-2007 01:58 AM
тАО07-19-2007 01:58 AM
Re: DHCP and VLANs
- Mark as New
- Bookmark
- Subscribe
- Mute
- Subscribe to RSS Feed
- Permalink
- Report Inappropriate Content
тАО07-19-2007 07:35 AM
тАО07-19-2007 07:35 AM
Re: DHCP and VLANs
The PC traffic will be going to the switch untagged, so the switch will put that untagged traffic into vlan 1. It will then do everything it needs to do to that traffic, including broadcasting broadcast traffic to where it needs to get, including DHCP requests going to the dhcp server on VLAN 1.
The phone traffic will be going to the switch encapsulated/tagged as vlan 2 traffic. The switch will then treat this tagged accordingly, and the broadcast traffic will go to any DHCP servers that are connected to VLAN 2.
- Mark as New
- Bookmark
- Subscribe
- Mute
- Subscribe to RSS Feed
- Permalink
- Report Inappropriate Content
тАО07-19-2007 07:42 AM
тАО07-19-2007 07:42 AM
Re: DHCP and VLANs
When a VLAN is defined you are in effect creating a separate network and traffic can only be forwarded through the virtual router interface that is created when you assign a VLAN an IP address. The process on the Procurves is pretty simple, on some other switches you have to define this virtual interface before you can assign an IP address to it, and therefore the VLAN.
Also if you are implementing VOIP this way one of the devices (probably the PC) on each port would be untagged in your data VLAN unless your PCs have network cards that support 802.1Q tagging.
- Mark as New
- Bookmark
- Subscribe
- Mute
- Subscribe to RSS Feed
- Permalink
- Report Inappropriate Content
тАО07-19-2007 07:47 AM
тАО07-19-2007 07:47 AM
Re: DHCP and VLANs
Traffic inside the VLAN will still be switched between hosts as they are in the same broadcast domain.