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Community Member

Cisco SG500 and ip helper-address

Hi all

I need your help

I have a Cisco SG500 (yeah I know, budget issues) which acts as L3 has 3 Vlans 200,300,400. If I configure all client nodes with static IP's, I'm able to ping between vlan's. Now that is not practical. I need to get automatic IP's on VLAN 200 and 300. I have to setup a DHCP server which I have on a Windows 2008R2 server with the correct settings. The problem is I'm not able to get any IP's on my client. PLEASE HELP

Following is my switch config

v1.3.5.58 / R750_NIK_1_35_647_358
CLI v1.0
set system mode router queues-mode 4

file SSD indicator encrypted
@
ssd-control-start
ssd config
ssd file passphrase control unrestricted
no ssd file integrity control
ssd-control-end cb0a3fdb1f3a1af4e4430033719968c0
!
vlan database
vlan 200,300,400
exit
voice vlan oui-table add 0001e3 Siemens_AG_phone________
voice vlan oui-table add 00036b Cisco_phone_____________
voice vlan oui-table add 00096e Avaya___________________
voice vlan oui-table add 000fe2 H3C_Aolynk______________
voice vlan oui-table add 0060b9 Philips_and_NEC_AG_phone
voice vlan oui-table add 00d01e Pingtel_phone___________
voice vlan oui-table add 00e075 Polycom/Veritel_phone___
voice vlan oui-table add 00e0bb 3Com_phone______________
no ip arp proxy disable
ip dhcp relay address 10.2.2.21
ip dhcp relay enable
ip dhcp information option
bonjour interface range vlan 1
hostname Switch
logging console alerts
username cisco password encrypted
!
interface vlan 1
 ip address 10.6.1.200 255.255.255.0
 no ip address dhcp
!
interface vlan 200
 ip address 10.2.2.1 255.255.255.0
!
interface vlan 300
  ip address 10.3.1.1 255.255.255.0
 ip dhcp relay enable
!
interface vlan 400
 name Switch1-VLAN
 ip address 10.4.1.1 255.255.255.0
!
interface gigabitethernet1/1/1
 ip address 192.168.1.100 255.255.255.0
!
interface gigabitethernet1/1/2
 description Link_to_WLC2504
 storm-control broadcast enable
 storm-control broadcast level 10
 spanning-tree link-type point-to-point
 macro description "router "
 macro auto smartport type router $native_vlan 1
!
interface gigabitethernet1/1/3
 switchport trunk allowed vlan add 200,300
!
interface gigabitethernet1/1/4
 spanning-tree disable
 switchport mode access
 switchport access vlan 300
!
interface gigabitethernet1/1/5
 switchport mode access
 switchport access vlan 300
!
interface gigabitethernet1/1/6
 switchport mode access
 switchport access vlan 300
!
interface gigabitethernet1/1/7
 switchport mode access
 switchport access vlan 300
!
interface gigabitethernet1/1/24
 switchport mode access
 switchport access vlan 200
!
interface gigabitethernet1/1/47
 switchport mode access
 switchport access vlan 300
!
interface gigabitethernet1/1/48
 spanning-tree disable
 switchport mode access
 switchport access vlan 400
!

exit
ip helper-address all 10.2.2.21 37 42 49 53 137 138
ip default-gateway 10.6.1.1
Switch# exit

 

 

 

 

 

3 REPLIES
Cisco Employee

Hi,I see that your DHCP

Hi,

I see that your DHCP server is on VLAN 200 and relay is set only on VLAN 300. So I guess on 200 is working fine as it is the same broadcast domain.

And when you are testing on VLAN 300 can you do packet capture on Windows 2008 server? 

Note: perhaps Windows server DHCP services needs to be restarted after configuration.

Regards ,

Aleksandra

Community Member

Hi,

Hi,

I understand this post is from a year ago.  Were you able to find out what's wrong?  I'm facing the same problem. 

Thanks!

Community Member

Re: Hi,

Fix the problem use this.

 

The Cisco SMB switches operate differently.

The IP Helper command on these units is just for UDP forwarding of odd services.

There are dedicated commands for DHCP relay:

ip dhcp relay address XXX.XX.XX.XX
ip dhcp relay enable
ip dhcp information option
ipv6 dhcp relay destination XXXX:XXX:XXXX:XX:XX

 

Then, on each SVI, you enable DHCP Relay as needed (you do not enable DHCP relay on the SVI directly connected to the DHCP server):

interface vlan XX
 ip dhcp relay enable

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