Cisco Catalyst Express 500 - DHCP Relay

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Feb 24th, 2010
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I wanted to know if DHCP relay is supported on the CCE 520? I believe the answer is no since that feature will require "IP Helper-Address" which requires a layer 3 switch and the CCE is layer 2 only. Basically, I want to connect IP Phones and PC's on two different VLAN's and use a DHCP server to do this.


Will this be a problem with this type of switch (layer 2) or will I require a L2 / L3 switch?


Any feedback is welcomed.


Thanks.

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Overall Rating: 4 (3 ratings)
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Reza Sharifi Wed, 02/24/2010 - 16:50
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Hi John,


You would need a layer-3 device to route between for example 2 PC vlans.  Do you have router? how many devices and also subnet/vlan do you have?

Also, the helper address would go on the router interface.

HTH

Reza

John Torkos Wed, 02/24/2010 - 17:12
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Thanks your reply. The design is that 2 VLAN's will be required per location; one for the IP phones and the other for their data.Please see below. Each location will have it's own DHCP server. Would a L3 switch still be required?



PC --- IP Phone --- Switch (Vlan 10 & 20) --- Router (802.1q trunking) ---- MPLS cloud --- Router  (802.1q trunking) --- Switch (VLAN 10 & 20) --- IP Phone --- PC

Reza Sharifi Wed, 02/24/2010 - 17:53
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John,


Yes, is this case the router at each location should have a helper address pointing to the local DHCP server.

Why do you have the same vlan ids on both side?  is this a layer-2 VPN?


HTH

Reza

John Torkos Wed, 02/24/2010 - 19:08
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Thank you for the response. I will purchase additional L2 / L3 switches then for each location. The VLAN IDs were for demonstration purpose to illustrate what it looks the network looks like.


Thanks again.


John

Paolo Bevilacqua Thu, 02/25/2010 - 14:13
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You do not need additional switches for that.

The router will do just fine.

Jon Marshall Fri, 02/26/2010 - 06:26
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p.bevilacqua wrote:


You do not need additional switches for that.

The router will do just fine.


Hmmm, i'm really not sure why this was rated a 1 as it is exactly right. The routers at each site that are already there could be used to do routing on a stick between the internal switches and the internal interface of each router.


I've rated this a 5 to try and rebalance but it would be nice if whoever rated the post a 1 could explain why it was not helpful.


Jon

Paolo Bevilacqua Fri, 02/26/2010 - 06:37
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Thank you Jon.


Unfortunately it's too easy to low-rate anonimously and without a reason.

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