05-01-2014 12:54 PM
I created 4 VLAN on SG500X-48 switch, with default VLAN 1 disabled.
(AD, DHCP & DNS server IP = 192.168.11.88, Default Gateway IP = 192.168.11.1)
DHCP server has scoops for VLAN 11, VLAN 21, VLAN 31 & VLAN 41
VLAN 11 - new default VLAN for AD, DHCP & DNS server (192.168.11.0/24)
VLAN 21 - Voice-VLAN (192.168.21.0/24)
VLAN 31 - Prod-VLAN (192.168.31.0/24)
VLAN 41 - Dev-LVAN (192.168.41.0/24)
VLAN 21, 31 & 41 cannot obtain auto IP addresses from VLAN 11's DHCP server
I have enabled ip helper-address 192.168.11.88 255.255.255.255 on each VLAN, but "show run" command results "ip helper-address 192.168.11.88 255.255.255.255 37 42 49 53 137 138"
If I added port 67 & 68 to the end of the "ip helper-address ip helper-address 192.168.11.88 255.255.255.255 67 68", it returns the following error "Ports 67-68 are reserved for BOOTP/DHCP"
If anyone can help shed some light I would really appreciate it.
Thanks in advance.
Solved! Go to Solution.
05-09-2014 10:21 AM
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
ipv6 dhcp relay destination
05-08-2014 06:24 AM
Some things to check, and I don't mean to offend if some of them seem obvious but you didn't list it above.
05-09-2014 10:21 AM
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
ipv6 dhcp relay destination
05-21-2018 11:59 PM
What will be the command for ipv4 addresses? Shall I just replace ipv6 with ipv4 on these commands?
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