DHCP Relay Problem

smavashev · ‎09-20-2012

Having a problem with 3550 Layer 3 Switch getting DHCP from 2800 Routers

Ths SVI's for layer 3/2 are working fine, and hosts are pinging.

Now my job is to get DHCP to work from 2800 to 3550 switch and in the end NAT translate it to the outside, When I configured DHCP on .3550 switch it worked fine, I do not know how to relay the DHCP address to the 3550 switch. Help !!!

3550 Switch

interface vlan 20

ip address 192.168.1.0 255.255.255.0

ip helper-address 10.1.1.1

router eigrp 1

network 10.1.1.1 255.255.255.252

network 192.168.1.0 255.255.255.0

----------------------------------------

Router 2800

int fa0/0

ip address 10.1.1.2 255.255.255.252

ip dhcp excluded-address 192.168.1.1 192.168.10.10

ip dhcp pool 2800

network 192.168.1.0 255.255.255.0

dns-server 167.206.245.129

default-router 192.168.1.1 ***(gateway)

ip nat MY-NAT-POOL 67.85.96.231 netmask 255.255.255.0

ip nat inside source list NAT fa0/1 overload

ip access-list extended NAT

permit ip 192.168.1.0 0.0.0.255 any

int fa0/1

ip address dhcp

router eigrp 1

network 10.1.1.1 255.255.255.252

network 67.85.96.231 netmask 255.255.255.0

Reza Sharifi · ‎09-20-2012

So, you are running EIGRP between the switch and the router?

Why do you have host network statement (10.1.1.1 255.255.255.252) under both router and switch EIGRP process?

If this is a /30 than it should look link this

10.1.1.0 255.255.255.252

Also, do you have EIGRP peering between the router and the switch?

sh ip eigrp nei

HTH