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I am Val Glinskiy, network engineer specializing in data center networks. TIME magazine selected me as Person of the Year in 2006.

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Thursday, March 15, 2007

Cisco Cat6500 copy configuration over SNMP

Cisco has a way to copy configuration to/from TFTP server using SNMP commands. I tried to follow Cisco's documentaion, but it did not work. Here is the right way:

~$ snmpset -v2c -c secret cr2 i 5
~$ snmpset -v2c -c secret cr2 i 1
~$ snmpset -v2c -c secret cr2 i 4
~$ snmpset -v2c -c secret cr2 i 1
~$ snmpset -v2c -c secret cr2 a
~$ snmpset -v2c -c secret cr2 s aaa
~$ snmpset -v2c -c secret cr2 i 1

Step 1.

In the tftpboot directory (or the directory of the tftp server) create a new empty text
file and name it config.txt. Make sure everybody can read and write to the file, i.e. "chmod 666 config.txt".

Command Syntax:
snmpset -v 2c -c <> <> <> <> <>

Step 2.

First snmpset we need to make is to create a new ROW in the device within the ccCopyTable
Mib, where all the values are going to be stored in order to gather the device running configuration.
Please check ccCopyEntryRowStatus MIB

snmpset -v2c -c <> <> i 5

NOTE: var_type is ?i? for Interger

Value 5 is for createAndWait

The number.222 is the entry index in the table. If the row is occupied then destroy it first and try to create it again.

Step 3.

We are going to use TFTP to transfer the device configuration with the OID ccCopyProtocol.

Check ccCopyProtocol MIB for details

snmpset -v2c -c <> <> i 1

NOTE: Value is 1 for tftp

Step 4.

We want to copy running configuration.

Please look into MIB ccCopySourceFileType

snmpset -v2c -c <> <> i 4

NOTE: Value is 4 for runningConfig
NOTE: Value is 3 for StartupConfig

Apparently, there is an error in the documentation.

Step 5.

Once we have specified the Source, we need to specify destination
ccCopyDestFileType MIB

snmpset -v2c -c <> <> i 1

NOTE: Value is 1 for networkFile

Step 6.
TFTP's server IP address is important part of the destination.

Check ccCopyServerAddress MIB for additional details

snmpset -v2c -c <> <> a < Server's IP>

NOTE: var_type is "a" for IP address

Value is the TFTP server's IP address

Step 7.
Now, we need to tell the name of the file where the data is going to be sent to or stored.

Please look into MIB ccCopyFileName

snmpset -v2c -c <> <> s config.txt

NOTE: var_type is "s" for Display String

Value is the file name in the TFTPboot previously created with full privileges

Step 8.
Now we activate row 222 with the following command.

Details are in ccCopyEntryRowStatus MIB

snmpset -v2c -c <> <> i 1

NOTE: Value is 1 for active.

Update: There is perl module to do the same thing.

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