DHCP failed. APIPA being used.

[dwallace7023]

I am using packet tracer.  I have a Router, Switch & 4 PC's.  When I go into the PC's Ip configuration & enable DHCP I get the "DHCP failed. APIPA being used" error.   What am I missing or doing wrong?

I used the following for configuration on R1: (only provided info for vlan 10 & 20)

ip dhcp excluded-address 172.31.10.1 172.31.10.10

ip dhcp pool VLAN_10

network 172.31.10.0 255.255.255.224

default-router 172.31.10.1

dns-server 209.165.201.14

interface g0/0.10

encapsulation dot1Q 10

ip address 172.31.10.1 255.255.255.224

ip dhcp excluded-address 172.31.20.1 172.31.20.10

ip dhcp pool VLAN_20

network 172.31.20.0 255.255.255.240

default-router 172.31.20.1

dns-server 209.165.201.14

interface g0/0.20

encapsulation dot1Q 20

ip address 172.31.20.1 255.255.255.240

[dwallace7023]

S2#show interfaces trunk

Port Mode Encapsulation Status Native vlan

Fa0/1 on 802.1q trunking 1

Fa0/2 on 802.1q trunking 1

Fa0/3 on 802.1q trunking 1

Fa0/4 on 802.1q trunking 1

Port Vlans allowed on trunk

Fa0/1 1-1005

Fa0/2 1-1005

Fa0/3 1-1005

Fa0/4 1-1005

Port Vlans allowed and active in management domain

Fa0/1 1,10,20,30,40

Fa0/2 1,10,20,30,40

Fa0/3 1,10,20,30,40

Fa0/4 1,10,20,30,40

Port Vlans in spanning tree forwarding state and not pruned

Fa0/1 1,10,20,30,40

Fa0/2 1,10,20,30,40

Fa0/3 1,10,20,30,40

Fa0/4 1,10,20,30,40

[MHM Cisco World]

But these port not connect to router

It connect to pc and it must be access

Only port connect to router config as trunk.

[dwallace7023]

  So, this was for  CCNA V7 Lab 10.3.1.2 Packet Tracer-Skills Integration Challenge

 I needed to add the vlans to S1 and after that the DHCP for the PC's worked. 

[MHM Cisco World]

Ok, i assume you already config it with:-

For you now and feature,

Never config port access mode  without 

Switchport access vlan x

If you dont enter this command then this port will be add to vlan 1 by default.

AND this command make sw automatic create vlan x.

Always when config 

Port access mode config vlan for this port

Port trunk config vlan allow in trunk