Cisco Support Community
cancel
Showing results for 
Search instead for 
Did you mean: 
Announcements

Welcome to Cisco Support Community. We would love to have your feedback.

For an introduction to the new site, click here. And see here for current known issues.

New Member

Cisco 3750 DHCP and Routing Errors

Hi All,

I have encounted an problem that currently has me stumped. I am trying to configure a 3750 switch with ipservices for use as a small localised test bed for wireless. what i am planning to implement is:

1 x 3750 PoE switch with 3 vlans

1 x WLC

1 x Access Point

1 x Laptop

My problems currently are occuring on the switch with DHCP and Routing. I have tried to implement a local DHCP service on the switch for use by the access point management to obtain their IPs, for wireless data and for laptops to obtain an IP.

My problem occurs when DHCP issues a ip address. when issusing a Show ip dhcp bindings i see an IP issued to a device and MAC. but the device fails to obtain an IP address.

I am also unable to ping between vlan as well.

!

version 15.0

no service pad

service timestamps debug datetime msec

service timestamps log datetime msec

!

no aaa new-model

switch 1 provision ws-c3750x-48p

system mtu routing 1500

ip routing

!

ip dhcp excluded-address 192.168.1.1 192.168.1.10

ip dhcp excluded-address 192.168.2.1 192.168.2.10

ip dhcp excluded-address 192.168.3.1 192.168.3.10

!

ip dhcp pool wireless_management

network 192.168.1.0 255.255.255.0

default-router 192.168.1.1 255.255.255.0

option 43 ascii 192.168.1.5

option 60 ascii Cisco AP c1550

domain-name stevenson.local

!

ip dhcp pool laptop_data

network 192.168.3.0 255.255.255.0

default-router 192.168.3.1 255.255.255.0

domain-name stevenson.local

!

ip dhcp pool wireless_data

network 192.168.2.0 255.255.255.0

default-router 192.168.2.1

domain-name stevenson.local

!

!

no ip domain-lookup

!

!

spanning-tree mode pvst

spanning-tree extend system-id

!

!

vlan internal allocation policy ascending

interface GigabitEthernet1/0/1

description wireless controller

switchport access vlan 10

switchport mode access

!

interface GigabitEthernet1/0/5

description laptop

switchport access vlan 30

switchport mode access

spanning-tree portfast

spanning-tree bpduguard enable

!

interface GigabitEthernet1/0/11

description wireless access point

switchport access vlan 10

spanning-tree portfast

spanning-tree bpduguard enable

!

interface GigabitEthernet1/0/12

switchport access vlan 10

switchport mode access

interface Vlan1

no ip address

shutdown

!

interface Vlan10

ip address 192.168.1.2 255.255.255.0

!

interface Vlan20

ip address 192.168.2.2 255.255.255.0

!

interface Vlan30

ip address 192.168.3.2 255.255.255.0

!

router rip

version 2

network 192.168.1.0

network 192.168.2.0

network 192.168.3.0

no auto-summary

!

ip http server

ip http secure-server

!

ip route 0.0.0.0 0.0.0.0 192.168.2.0

!

!

!

!

!

line con 0

line vty 5 15

!

end

1 REPLY
New Member

Re: Cisco 3750 DHCP and Routing Errors

Hi there.

If you look at the DHCP config for laptops you have a default router as 192.168.3.1.
Your vlan ip address is 192.168.3.2

The DHCP scope gives a default gateway for data as 192.168.3.1 rather than the VLAN IP address of 192.168.3.2

I would recommend changing the DHCP scope default router to 192.168.3.2 from 192.168.2.1 OR change your VLAN IP address to match the DHCP scope.



Sent from Cisco Technical Support iPad App

181
Views
0
Helpful
1
Replies
CreatePlease login to create content