Microsoft
Software
Hardware
Network
Question : CISCO DHCP POOL AND DEVICE ISSUES
I have a Cisco 3845 that is connected to a Cisco 4507R. I have dual DHCP pools setup. One for VOice one for Data. Data is on the Native VLAN 1 and Voice goes to Vlan2. I am not able to get any devices to talk or pull an IP Address from the ROuter. Can someone help me understand why?
Building configuration...
Current configuration : 3096 bytes
!
version 12.4
service timestamps debug datetime msec
service timestamps log datetime msec
no service password-encryption
!
hostname 3845_BAKE
!
boot-start-marker
boot-end-marker
!
!card type command needed for slot 1
logging buffered 51200 warnings
!
no aaa new-model
ip cef
!
!
no ip dhcp use vrf connected
ip dhcp excluded-address 10.10.15.1 10.10.15.100
ip dhcp excluded-address 10.10.14.1 10.10.14.100
!
ip dhcp pool dhcp-phones
network 10.10.15.0 255.255.255.0
default-router 10.10.15.1
dns-server 10.10.22.199
!
ip dhcp pool data
network 10.10.14.0 255.255.255.0
default-router 10.10.14.1
dns-server 10.10.22.199
!
!
!
voice-card 0
no dspfarm
!
!
!
!
!
!
!
!
!
!
!
!
!
!
crypto pki trustpoint TP-self-signed-2703395021
enrollment selfsigned
subject-name cn=IOS-Self-Signed-Certifi
cate-27033
95021
revocation-check none
rsakeypair TP-self-signed-2703395021
!
!
username cisco privilege 15 secret 5 $1$h18f$RMj62jSsKiMvUwkkxY
tkz/
!
!
!
!
!
!
!
interface Loopback0
ip address 1.1.1.1 255.255.255.255
!
interface Tunnel0
ip address 10.32.1.1 255.255.0.0
tunnel source 24.199.62.237
tunnel destination 24.199.62.236
!
interface GigabitEthernet0/0
description Trunk_to_Switch
no ip address
duplex full
speed 1000
media-type rj45
!
interface GigabitEthernet0/0.1
description Data_VLAN
encapsulation dot1Q 1 native
ip address 10.10.14.1 255.255.255.0
!
interface GigabitEthernet0/0.2
description Voice_VLAN
encapsulation dot1Q 2
ip address 10.10.15.1 255.255.255.0
!
interface GigabitEthernet0/1
no ip address
duplex full
speed 100
media-type rj45
!
interface IDS-Sensor2/0
no ip address
shutdown
hold-queue 60 out
!
interface Analysis-Module3/0
no ip address
shutdown
hold-queue 60 out
!
router eigrp 3
network 10.10.0.0 0.0.255.255
network 10.0.0.0
no auto-summary
!
ip default-gateway 24.199.62.233
!
!
ip http server
ip http access-class 23
ip http authentication local
ip http secure-server
ip http timeout-policy idle 60 life 86400 requests 10000
!
access-list 25 permit 10.0.0.0 0.255.255.255
!
!
!
!
control-plane
!
!
!
!
!
!
!
!
!
banner login ^CCCC
--------------------------
----------
----------
----------
----------
-----
This system is for Authorized use only. If unauthorized, please leave
Now.
AUTHORIZED ONLY PROCEED!
--------------------------
----------
----------
----------
----------
-----
^C
!
line con 0
login local
stopbits 1
line 130
no activation-character
no exec
transport preferred none
transport input all
transport output pad telnet rlogin lapb-ta mop udptn v120 ssh
line 194
no activation-character
no exec
transport preferred none
transport input all
transport output pad telnet rlogin lapb-ta mop udptn v120 ssh
line aux 0
stopbits 1
line vty 0 4
access-class 23 in
privilege level 15
login local
transport input telnet ssh
line vty 5 15
access-class 23 in
privilege level 15
login local
transport input telnet ssh
!
scheduler allocate 20000 1000
!
end
This is the config for the Switch
3845_BAKE#sh run
Building configuration...
Current configuration : 4756 bytes
!
version 12.2
no service pad
service timestamps debug uptime
service timestamps log uptime
no service password-encryption
service compress-config
!
hostname Switch
!
boot-start-marker
boot system flash bootflash:cat4000-i5s-mz.1
22-25.EWA8
.bin
boot-end-marker
!
!
redundancy
mode sso
main-cpu
auto-sync standard
!
no aaa new-model
ip subnet-zero
!
!
no file verify auto
spanning-tree mode pvst
spanning-tree extend system-id
power redundancy-mode redundant
!
!
!
vlan internal allocation policy ascending
!
interface GigabitEthernet1/1
!
interface GigabitEthernet1/2
!
interface GigabitEthernet2/1
!
interface GigabitEthernet2/2
!
interface FastEthernet3/1
!
interface FastEthernet3/2
!
interface FastEthernet3/3
switchport voice vlan 2
!
interface FastEthernet3/4
!
interface FastEthernet3/5
!
interface FastEthernet3/6
!
interface FastEthernet3/7
!
interface FastEthernet3/8
!
interface FastEthernet3/9
!
interface FastEthernet3/10
!
interface FastEthernet3/11
!
interface FastEthernet3/12
!
interface FastEthernet3/13
!
interface FastEthernet3/14
!
interface FastEthernet3/15
!
interface FastEthernet3/16
!
interface FastEthernet3/17
!
interface FastEthernet3/18
!
interface FastEthernet3/19
!
interface FastEthernet3/20
!
interface FastEthernet3/21
!
interface FastEthernet3/22
!
interface FastEthernet3/23
!
interface FastEthernet3/24
!
interface FastEthernet3/25
!
interface FastEthernet3/26
!
interface FastEthernet3/27
!
interface FastEthernet3/28
!
interface FastEthernet3/29
!
interface FastEthernet3/30
!
interface FastEthernet3/31
!
interface FastEthernet3/32
switchport voice vlan 2
speed 100
duplex full
!
interface FastEthernet3/33
!
interface FastEthernet3/34
!
interface FastEthernet3/35
!
interface FastEthernet3/36
!
interface FastEthernet3/37
!
interface FastEthernet3/38
!
interface FastEthernet3/39
!
interface FastEthernet3/40
!
interface FastEthernet3/41
!
interface FastEthernet3/42
!
interface FastEthernet3/43
!
interface FastEthernet3/44
!
interface FastEthernet3/45
!
interface FastEthernet3/46
!
interface FastEthernet3/47
!
interface FastEthernet3/48
!
interface FastEthernet4/1
!
interface FastEthernet4/2
!
interface FastEthernet4/3
!
interface FastEthernet4/4
!
interface FastEthernet4/5
!
interface FastEthernet4/6
!
interface FastEthernet4/7
!
interface FastEthernet4/8
!
interface FastEthernet4/9
!
interface FastEthernet4/10
!
interface FastEthernet4/11
!
interface FastEthernet4/12
!
interface FastEthernet4/13
!
interface FastEthernet4/14
!
interface FastEthernet4/15
!
interface FastEthernet4/16
!
interface FastEthernet4/17
!
interface FastEthernet4/18
!
interface FastEthernet4/19
!
interface FastEthernet4/20
!
interface FastEthernet4/21
!
interface FastEthernet4/22
!
interface FastEthernet4/23
!
interface FastEthernet4/24
!
interface FastEthernet4/25
!
interface FastEthernet4/26
!
interface FastEthernet4/27
!
interface FastEthernet4/28
!
interface FastEthernet4/29
!
interface FastEthernet4/30
!
interface FastEthernet4/31
!
interface FastEthernet4/32
!
interface FastEthernet4/33
!
interface FastEthernet4/34
!
interface FastEthernet4/35
!
interface FastEthernet4/36
!
interface FastEthernet4/37
!
interface FastEthernet4/38
!
interface FastEthernet4/39
!
interface FastEthernet4/40
!
interface FastEthernet4/41
!
interface FastEthernet4/42
!
interface FastEthernet4/43
!
interface FastEthernet4/44
!
interface FastEthernet4/45
!
interface FastEthernet4/46
!
interface FastEthernet4/47
!
interface FastEthernet4/48
!
interface GigabitEthernet5/1
description TRUNK LINE ROUTER
switchport trunk encapsulation dot1q
switchport trunk allowed vlan 1,2
switchport mode trunk
speed 1000
duplex full
!
interface GigabitEthernet5/2
switchport trunk encapsulation dot1q
switchport trunk allowed vlan 1-3
speed 100
duplex full
!
interface GigabitEthernet5/3
!
interface GigabitEthernet5/4
!
interface GigabitEthernet5/5
!
interface GigabitEthernet5/6
!
interface GigabitEthernet5/7
!
interface GigabitEthernet5/8
!
interface GigabitEthernet5/9
!
interface GigabitEthernet5/10
!
interface GigabitEthernet5/11
!
interface GigabitEthernet5/12
!
interface GigabitEthernet5/13
!
interface GigabitEthernet5/14
!
interface GigabitEthernet5/15
!
interface GigabitEthernet5/16
!
interface GigabitEthernet5/17
!
interface GigabitEthernet5/18
!
interface GigabitEthernet5/19
!
interface GigabitEthernet5/20
!
interface GigabitEthernet5/21
!
interface GigabitEthernet5/22
!
interface GigabitEthernet5/23
!
interface GigabitEthernet5/24
!
interface Vlan1
description Data VLAN
ip address 10.10.14.10 255.255.255.0
!
interface Vlan2
description Voice VLAN
ip address 10.10.15.10 255.255.255.0
!
interface Vlan3
no ip address
!
ip http server
!
!
!
!
!
line con 0
stopbits 1
line vty 0 4
no login
!
!
end
Answer : CISCO DHCP POOL AND DEVICE ISSUES
It has to do with ip helper addresses missing. However, since both devices are L3, you don't need to use your 3845 as a router-on-a-stick. You can use the switch to do inter-VLAN-routing.
So, enable DHCP on the switch and disable it on the router. Or, convert the link from the switch to the router to a different L3 subnet and add IP helper addresses on the switch VLAN interfaces that point to the new router interface IP address. Of course, make sure to change the default gateways accordingly. Those should be the switch VLAN interface IPs.
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