Cisco – Is possible to configure a Cisco 881 by DHCP

ciscodhcp

I'm wondering if is possible to configure a Cisco Router 881 from a file on a tftp instruct on a DHCP option. I know is possible to configure the wan port through DHCP by configuring "ip address dhcp" but what I search is there is a way to act as an Cable Modem CPE, dowload the configuration file from the DHCP and load it.

on the DHCP I've configure the following option as it will be for a CPE

filename "tftp://172.16.0.1/conf";

warning I'm not asking how to configure DHCP server on Cisco Router.

Best Answer

is there is a way to act as an Cable Modem CPE, download the configuration file from the DHCP [Option 67] and load it.

You are asking about Autoinstall in Cisco IOS:

Router (with blank NVRAM) pulls an address from DHCP
Router uses DHCP Options 3, 6, 66, 67, and 150 to reconfigure itself via TFTP

I also found a pretty good blog post on autoinstall

If you're looking for a tool to perform Autoinstall, check out freeztp; it's written in Python and uses a series of commands to set up configurable templates for IOS routers and switches.

Thank you for asking about this feature, I completely forgot it existed.

Related Solutions

Cisco – PPPoA ADSL Configuration with external modem on Cisco 891

Technically, you're doing PPPoEoA.

The VC Mux part will have to be set on the modem, as that's the only thing that has access to the ATM layer. If you had a dsl interface in the router, you'd do:

blue-gw#show run int atm0.1
Building configuration...

Current configuration : 131 bytes
!
interface ATM0.1 point-to-point
 bandwidth 6000
 pvc dsl 8/35 
  encapsulation aal5mux ppp dialer
  dialer pool-member 1
 !
end

Other devices will vary.

Cisco – how to get scp via snmp to work with cisco routers

I just tried this on my CPE:

[ytti@lintukoto ~]% cat moi2.sh 
#!/bin/sh

snmp="snmpset -v2c -cfoo bu.ip.fi"

$snmp 1.3.6.1.4.1.9.9.96.1.1.1.1.2.9 i 4 \
      1.3.6.1.4.1.9.9.96.1.1.1.1.3.9 i 4 \
      1.3.6.1.4.1.9.9.96.1.1.1.1.4.9 i 1 \
      1.3.6.1.4.1.9.9.96.1.1.1.1.5.9 a 91.198.120.2 \
      1.3.6.1.4.1.9.9.96.1.1.1.1.6.9 s filename \
      1.3.6.1.4.1.9.9.96.1.1.1.1.7.9 s username \
      1.3.6.1.4.1.9.9.96.1.1.1.1.8.9 s password \
      1.3.6.1.4.1.9.9.96.1.1.1.1.14.9 i 4
sleep 10
$snmp 1.3.6.1.4.1.9.9.96.1.1.1.1.14.9 i 6
[ytti@lintukoto ~]%

Which copies running config (4) to network (1), by swapping these you can change the direction (from network to running).

Running above script my home directory will have 'filename' file, which contains my CPE running-config:

[ytti@lintukoto ~]% ls -la filename
ls: cannot access filename: No such file or directory
[2 ytti@lintukoto ~]% ./moi2.sh      
iso.3.6.1.4.1.9.9.96.1.1.1.1.2.9 = INTEGER: 4
iso.3.6.1.4.1.9.9.96.1.1.1.1.3.9 = INTEGER: 4
iso.3.6.1.4.1.9.9.96.1.1.1.1.4.9 = INTEGER: 1
iso.3.6.1.4.1.9.9.96.1.1.1.1.5.9 = IpAddress: 91.198.120.2
iso.3.6.1.4.1.9.9.96.1.1.1.1.6.9 = STRING: "filename"
iso.3.6.1.4.1.9.9.96.1.1.1.1.7.9 = STRING: "username"
iso.3.6.1.4.1.9.9.96.1.1.1.1.8.9 = STRING: "password"
iso.3.6.1.4.1.9.9.96.1.1.1.1.14.9 = INTEGER: 4
iso.3.6.1.4.1.9.9.96.1.1.1.1.14.9 = INTEGER: 6
[ytti@lintukoto ~]% ls -la filename
-rw-r--r-- 1 ytti ytti 16172 Jun 11 00:35 filename
[ytti@lintukoto ~]%

On top of what @daniel mentions also your '14' or 'rowstatus' is wrong, you use 1 'active', while you should use 4 'createAndGo'.

Best Answer

Related Solutions

Cisco – PPPoA ADSL Configuration with external modem on Cisco 891

Cisco – how to get scp via snmp to work with cisco routers

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