03-30-2017 02:42 AM - edited 03-08-2019 09:58 AM
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?
02-22-2019 06:16 AM - edited 02-22-2019 06:17 AM
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.
Discover and save your favorite ideas. Come back to expert answers, step-by-step guides, recent topics, and more.
New here? Get started with these tips. How to use Community New member guide