10-03-2014 02:15 AM - edited 03-03-2019 07:36 AM
Hello =)
I am new to networking and im having trouble configuring my layer 3 switch.
I have done some research and have tried several different ways to configure the multi layer switch to produce DHCP for each VLAN.
Each VLAN must have a different subnet.
Any help would be much appreciated
Thank you <3
10-03-2014 06:42 AM
Hi,
Yes, you need to have different subnet for each vlan.
Let us consider you are having 3 vlans 10, 20 and 30.
Vlan 10 : 192.168.10.0/24
Vlan 20 : 192.168.20.0/24
Vlan 30 : 192.168.30.0/24
This switch interface vlan is the default gateway for the respective hosts in respective vlans.
Configuration :
Configure vlan 10, 20 and 30.
!
interface Vlan10
ip address 192.168.10.1 255.255.255.0
no shut
!
interface Vlan20
ip address 192.168.20.1 255.255.255.0
no shut
!
interface Vlan30
ip address 192.168.30.1 255.255.255.0
no shut
!
!
ip dhcp excluded-address 192.168.10.1 192.168.10.10
ip dhcp excluded-address 192.168.20.1 192.168.20.10
ip dhcp excluded-address 192.168.30.1 192.168.30.10
!
ip dhcp pool vlan10
network 192.168.10.0 255.255.255.0
default-router 192.168.10.1
lease infinite
!
ip dhcp pool vlan20
network 192.168.20.0 255.255.255.0
default-router 192.168.20.1
lease infinite
!
ip dhcp pool vlan30
network 192.168.30.0 255.255.255.0
default-router 192.168.30.1
lease infinite
!
There are multiple options in DHCP configuration.
Configure as per your requirement.
e.g.
Cisco-switch(config)#ip dhcp pool vlan10
Cisco-switch(dhcp-config)#?
DHCP pool configuration commands:
accounting Send Accounting Start/Stop messages
address Configure a reserved address
bootfile Boot file name
class Specify a DHCP class
client-identifier Client identifier
client-name Client name
default-router Default routers
dns-server DNS servers
domain-name Domain name
exit Exit from DHCP pool configuration mode
hardware-address Client hardware address
host Client IP address and mask
import Programatically importing DHCP option parameters
lease Address lease time
netbios-name-server NetBIOS (WINS) name servers
netbios-node-type NetBIOS node type
network Network number and mask
next-server Next server in boot process
no Negate a command or set its defaults
option Raw DHCP options
origin Configure the origin of the pool
relay Function as a DHCP relay
remember Remember released bindings
renew Configure renewal policy
reserved-only Only allocate reserved addresses
server Configure the server ID option value
subnet Subnet allocation commands
update Dynamic updates
utilization Configure various utilization parameters
vrf Associate this pool with a VRF
To check if its working fine please use command below,
Cisco-switch#show ip dhcp binding
Bindings from all pools not associated with VRF:
IP address Client-ID/ Lease expiration Type
Hardware address/
User name
!
Also refer the links below,
https://supportforums.cisco.com/discussion/10791041/how-configure-cisco-switch-3750-dhcp-2-vlan
http://www.cisco.com/c/en/us/td/docs/switches/lan/catalyst3750/software/release/12-2_52_se/configuration/guide/3750scg/swipaddr.html#wp1094520
Hope this helps.
--
Sandesh Sawant.
.
<rate if useful >
10-03-2014 07:15 AM
Thanks so much for the help =D was very useful =D
10-03-2014 11:25 AM
Hi Crazo,
Thanks for the reply and the rating.
--
With best regards,
Sandesh Sawant.
.
10-03-2014 06:42 AM
Well the reason your DHCP is not working is because you do not have an equivalent LAYER3 interface for that VLAN
You only have one L3 VLAN w/c is VLAN300
To make your DHCP work make sure to create L3 interfaces for all the networks you have in your L3 switch.
#interface vlan 10
#ip address <IP> <SM>
#interface vlan 11
#ip address <IP> <SM>
#interface vlan 12
#ip address <IP> <SM>
vice versa
10-03-2014 07:16 AM
Thanks so much for the help =D was very useful =D
10-03-2014 07:19 AM
Hey dude don't forget to mark as correct and as well rate posts that have been helpful to you :)
It closes your discussion and as well give supportforums an archive of this :D
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