Take the 2-minute tour ×
Server Fault is a question and answer site for professional system and network administrators. It's 100% free, no registration required.

I have a Cisco 3550 Switch (with an EMI) image. I seem to be stuck trying to figure out if the switch has a possibility of setting IP addresses (i thought Layer 3 switches could do that). I want to set up a vlan for specific ports in my lab and then use the switch to relay DHCP requests out a specific port.

FA 0/1 --- I want to be the default port / thing everything communicates between the router (not using a cisco router right now so i cannot set up a trunk port etc)

I want Fa0/23 to be configured to get DHCP address from router through fa0/1 (will my switch know that? or time out? It seems to take longer than if i plugged directly into the back of my router.

thanks,

share|improve this question
    
What are your subnet configurations? You want Fa0/23 to get a DHCP address or do you rather want what is plugged in Fa0/23 to get a DHCP address? You'll have to refine your question with more details on your network setup. I can give you many ways to do that but they all depend on what is what and what sub-net, what routes where, etc. –  ETL Apr 28 '13 at 13:50
add comment

1 Answer

You can setup a VLAN and have your switch receive DHCP packets through there.

interface Vlan12
 ip address 10.10.12.254 255.255.255.0
 ip helper-address 10.10.14.201

The ip helper-address will broadcast DHCP request to your router.

Then setup your interfaces on that VLAN.

interface FastEthernet0/23
switch port access vlan12
switch mode trunk
share|improve this answer
    
-sorry for delayed response have been busy with work and placed my studies aside - But in regards to your answer, do I have to set up "router on a stick" vlan configuration to set up a trunk mode on port? Or can I just have vlans exist within the switch and router not know about it? –  Bain May 26 '13 at 15:54
add comment

Your Answer

 
discard

By posting your answer, you agree to the privacy policy and terms of service.

Not the answer you're looking for? Browse other questions tagged or ask your own question.