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тАО01-22-2010 12:45 PM
тАО01-22-2010 12:45 PM
VLAN & DHCP Problem
The Core has 4 vlans:
Vlan 1 = Management
Vlan 2 = Data
Vlan 3 = Voice
Vlan 4 = Servers
Core:
Port 1 = management
Ports 2 - 20 untagged in Vlan 4
Ports 21 - 24 tagged in vlans 2 & 3
IP helper-address is configured for vlan2 (10.0.0.3 Windows DHCP Server)
DHCP-Relay is on
IP UDP-BCAST-Forward is on
Edge switches
Vlan 1 = Management
Vlan 2 = Data
Vlan 3 = Voice
Ports 1 - 23 untagged vlan 2
Port 24 tagged in vlan 2
Problem:
laptop plugged in a port belonging to Vlan2 does not recieve an IP address via DHCP.
If I configure a static IP address on the laptop everything if fine, I can even browse shares on the DHCP server and the DHCP server can contact the laptop.
The switches are running the latest fireware.
Please help, I need to implement this solution first thing tomorrow!
Configs:
CORE
Running configuration:
; J9145A Configuration Editor; Created on release #W.14.38
hostname "Lornamead Core Switch"
module 1 type J9145A
interface 21
name "Uplink for Edge"
exit
interface 22
name "Uplink for Edge"
exit
interface 23
name "Uplink for Edge"
exit
interface 24
name "Uplink for Edge"
exit
ip routing
ip udp-bcast-forward
vlan 1
name "Mgmt"
untagged 1,21-24
ip address 172.16.10.254 255.255.255.0
no untagged 2-20
exit
vlan 2
name "Data"
ip helper-address 10.0.0.36
ip address 10.1.0.254 255.255.255.0
tagged 21-24
exit
vlan 3
name "Voice"
ip address 192.168.1.254 255.255.255.0
tagged 21-24
exit
vlan 4
name "Servers"
untagged 2-20
ip address 10.0.0.254 255.255.255.0
exit
snmp-server community "public" unrestricted
password manager
EDGES:
; J9299A Configuration Editor; Created on release #J.14.01
hostname "Lornamead Edge .251"
ip default-gateway 10.0.0.254
vlan 1
name "Mgmt"
untagged 24
ip address 172.16.10.251 255.255.255.0
no untagged 1-23
exit
vlan 2
name "Data"
untagged 1-23
tagged 24
no ip address
exit
vlan 3
name "Voice"
tagged 24
no ip address
exit
snmp-server community "public" Unrestricted
Please please can someone helpme??
Thanks
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тАО01-22-2010 05:21 PM
тАО01-22-2010 05:21 PM
Re: VLAN & DHCP Problem
The trouble is that your "core" switch doesn't know how to route the traffic to the DHCP server.
You can fix it be enabling routing ("ip routing") however this would mean that it would route traffic across all VLANs that it has an IP address on. i.e. your clients would be able to see all your servers etc.
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тАО01-23-2010 10:16 AM
тАО01-23-2010 10:16 AM
Re: VLAN & DHCP Problem
Does the laptop get an IP address when plugged into the core switch in either Server Or Data VLAN?
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тАО01-23-2010 04:58 PM
тАО01-23-2010 04:58 PM
Re: VLAN & DHCP Problem
1-whic port connect your dhcp server
2-what is the default gateway address your dhcp server
and ip routing must have enable on core switch
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тАО01-25-2010 01:04 AM
тАО01-25-2010 01:04 AM
Re: VLAN & DHCP Problem
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тАО01-25-2010 02:42 AM
тАО01-25-2010 02:42 AM
Re: VLAN & DHCP Problem
Try what kianwei suggests :)