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Beginner

AutoInstall Using DHCP for LAN Interfaces

Hello

According to this document, a new C800 router will send DHCP discover packets out of all attached LAN interfaces to determine if a DHCP server is available.

I have tried several Cisco routers in the 800 series. 

No DHCP discover is seen. Only CDP/STP. The routers are brand new and IOS is supported. 

The router will send a DHCP discover if I type the following from console. 

conf t

int vlan1

ip address dhcp

Do I miss something here?

1 REPLY 1
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Beginner

Re: AutoInstall Using DHCP for LAN Interfaces

Had the same problem. you have to connect the uplink port to the WAN interface of the router to get it to work. It seems counter intuitive, as all routed ports are admin down per default. But this only happens after you negate the initial configuration dialog question:

Would you like to enter the initial configuration dialog? [yes/no]: no

Only switchports remain admin up after you selected no:

Router#show interfaces description
Interface                      Status         Protocol Description
AT0                            admin down     down
BR0                            admin down     down
BR0:1                          admin down     down
BR0:2                          admin down     down
Et0                            admin down     down
Gi0                            down           down
Gi1                            down           down
Gi2                            down           down
Gi3                            down           down
Gi4                            down           down
Gi5                            down           down
Gi6                            down           down
Gi7                            down           down
Gi8                            admin down     down
Vl1                            down           down

But if you connect the uplink to the WAN port (Gi8) and be patient, you will see the router is trying to load the configuration files from the TFTP server that has been provided by DHCP option:

Installed image archive
Cisco C897VA-K9 (revision 1.0) with 488524K/35763K bytes of memory.
Processor board ID FCZ220510DX
1 DSL controller
1 Ethernet interface
9 Gigabit Ethernet interfaces
1 ISDN Basic Rate interface
1 ATM interface
1 Virtual Private Network (VPN) Module
DRAM configuration is 32 bits wide
255K bytes of non-volatile configuration memory.
250880K bytes of ATA System CompactFlash (Read/Write)


         --- System Configuration Dialog ---

Would you like to enter the initial configuration dialog? [yes/no]:
%Error opening tftp://172.16.20.89/network-confg (Timed out)
%Error opening tftp://172.16.20.89/cisconet.cfg (Timed out)
Loading roTST01-confg from 172.16.20.89 (via GigabitEthernet8): !
[OK - 4189 bytes]
Domain server mapped address 172.16.20.89 to SRVMWTFT01.company.local

And there your configuration will be applied like you are used to from AutoInstall. Strangely, the assigned IP information is displayed just after the configuration has been applied:

*Feb 22 13:59:20.259: %LINEPROTO-5-UPDOWN: Line protocol on Interface VoIP-Null0, changed state to up
*Feb 22 13:59:20.259: %LINEPROTO-5-UPDOWN: Line protocol on Interface ATM0, changed state to down
*Feb 22 13:59:20.259: %LINK-3-UPDOWN: Interface Ethernet0, changed state to up
*Feb 22 13:59:20.259: %LINEPROTO-5-UPDOWN: Line protocol on Interface BRI0, changed state to down
*Feb 22 13:59:20.259: %LINEPROTO-5-UPDOWN: Line protocol on Interface BRI0:1, changed state to down
*Feb 22 13:59:20.259: %LINEPROTO-5-UPDOWN: Line protocol on Interface BRI0:2, changed state to down
*Feb 22 13:59:20.259: %LINK-3-UPDOWN: Interface GigabitEthernet8, changed state to up
*Feb 22 13:59:21.071: %LINEPROTO-5-UPDOWN: Line protocol on Interface Vlan1, changed state to down
*Feb 22 13:59:21.259: %LINEPROTO-5-UPDOWN: Line protocol on Interface Ethernet0, changed state to down
*Feb 22 13:59:21.259: %LINEPROTO-5-UPDOWN: Line protocol on Interface GigabitEthernet8, changed state to up
*Feb 22 13:59:35.263:   Setting system hostname to roTST01
*Feb 22 13:59:38.383: AUTOINSTALL: GigabitEthernet8 is assigned 172.16.22.8
*Feb 22 13:59:38.383: AUTOINSTALL: Obtain tftp server address (opt 150) 172.16.20.89

Hope im not too late with this information.

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