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Question : CISCO DHCP POOL AND DEVICE ISSUES
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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-Certificate-2703395021 revocation-check none rsakeypair TP-self-signed-2703395021 ! ! username cisco privilege 15 secret 5 $1$h18f$RMj62jSsKiMvUwkkxYtkz/ ! ! ! ! ! ! ! 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.122-25.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
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Answer : CISCO DHCP POOL AND DEVICE ISSUES
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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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