Cisco 设备上的扩展 ping

Question

I'm newbie in Python. I try make a script to perform automatic "extended ping".

The manual cisco flow is:

    switch#**ping**
    Protocol [ip]:
    Target IP address: **X.X.X.X**
    Repeat count [5]: **1000**
    Datagram size [100]: **1500**
    Timeout in seconds [2]:
    Extended commands [n]:
    Sweep range of sizes [n]:
    ####################Command Start####################

I try to use the command: "net_connect.send_command" from Netmiko and doesn't work.

    Ping_Extended = [ 'ping','\n','X.X.X.X','1000','1500','\n','\n','\n' ]

    Ping_TASA = net_connect.send_command(Ping_Extended)

    Error: Traceback (most recent call last):
    File "VLAN1.py", line 124, in <module>
    Ping_Extended = Ping_Extended.rstrip()
    AttributeError: 'list' object has no attribute 'rstrip'

can Someone help me?. if another method exist please shared me.

Thanks a lot!

Answer 1

I haven't used that library, so I'm not sure how it works, I'm using paramiko or telnetlib, depending on the available service on the device.
My ping command on Cisco looks something like this:

def ping(dest, count=5, size=None, interval=None, timeout=None, source=None):
    # ignore the "interval" it's there in order to have the same signature 
    # on all devices, Cisco doesn't accept interval parameter 
    cmd = "ping %s repeat %s" % (dest, count)
    for x in [("size", size), ("timeout", timeout), ("source", source)]:
        if x[1]:
            cmd += " %s %s" % x
    cmd += " validate"
    # the "validate" seemed to be required in order to get extra statistics 
    # run the command, get the output, parse it

For example by calling ping("8.8.8.8", 3, 128, 1, 2, "86.68.86.68") will end up running ping 8.8.8.8 repeat 3 size 128 timeout 2 source 86.68.86.68 validate on the device.

Side note : instead of calling ping with no arguments and wait for the prompts, try adding "?" at end of the line ( ping ? ) in order to discover the available options, pretty much as the bash-completion works with Tab . I mean, from what I've seen on the devices I've worked with, you don't have to follow the flow, you should be able to execute the ping with one single command invocation.

I've taken look at the library you are using, I've noticed that the send_command accepts an argument expect_string you could use it to detect the new/different prompt, I think that your code should be something like this:

cmds = ['ping', 'ip', 'X.X.X.X','1000','1500','2','n','n' ]
for cmd in cmd[:-1] : 
    net_connect.send_command(cmd, expect_string='\] ?: ?')
output = net_connect.send_command(cmds[-1])

I've added all the defaults to the list of commands to send. If you don't want to send them, replace them with "" (empty strings).

Answer 2

I solved the issue and I share with you.

   output = [net_connect.send_command("ping", expect_string='#?'),
             net_connect.send_command("ip", expect_string=':?'),
             net_connect.send_command("192.168.1.254", expect_string=':?'),
             net_connect.send_command("1000", expect_string=':?'),
             net_connect.send_command("1500", expect_string=':?'),
             net_connect.send_command("2", expect_string=':?'),
             net_connect.send_command("n", expect_string=':?'),
             net_connect.send_command("n", expect_string=':?', delay_factor=140)]

print output[-1]

Best regards