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alex goshtaei
Beginner

DHCP relay over L3

Hi All, 

we have topology like: 

DHCP server >> L3 switch >> EIGRP >> L3 switch >> DHCP client 

 

DHCP client is not able to get IP address from DHCP server. I did "ip helper-address" and "no ip directed-broadcast", but no luck. 

 

interface in L3 switch on right: 

interface Vlan550
 description *** RFID ***
 ip address 172.24.149.254 255.255.255.128
 ip helper-address 172.25.128.1
end

 

 

here is the debug from switch on the right: 

*May  5 10:55:04.447: DHCPD: Reload workspace interface Vlan550 tableid 0.

*May  5 10:55:04.447: DHCPD: tableid for 172.24.149.254 on Vlan550 is 0

*May  5 10:55:04.447: DHCPD: client's VPN is .

*May  5 10:55:04.447: DHCPD: using received relay info.

*May  5 10:55:04.447: DHCPD: Sending notification of DISCOVER:

*May  5 10:55:04.447:   DHCPD: htype 1 chaddr b86b.2328.d31d

*May  5 10:55:04.447:   DHCPD: interface = Vlan550

*May  5 10:55:04.447:   DHCPD: class id 4d53465420352e30

*May  5 10:55:04.447: DHCPD: Looking up binding using address 172.24.149.254

*May  5 10:55:04.447: DHCPD: setting giaddr to 172.24.149.254.

*May  5 10:55:04.447: DHCPD: BOOTREQUEST from 01b8.6b23.28d3.1d forwarded to 172.25.128.1.

 

I don't see OFFER message back from DHCP server. 

 

any suggestion would be appreciated. 

 

thanks 

Alex

 

 

1 REPLY 1
Jon Marshall
VIP Community Legend

Alex

If you can ping the DHCP server from the right hand switch and you do not have any acls that could be blocking the DHCP request then it is probably an issue with your DHCP scope.

Jon