Cisco CSR1000V Software Upgrade – Automated

No. There’s no need to export the IOS-Config, deploy another Router-VM using an OVA and import the old IOS-Config to this new router.

  • even, if finetuned… This strategy might lower the downtime!?
  • VMware uses this strategy when upgrading NSX-Edge-Gateways very successfully!

But this is a lab environment, i’ll have to upgrade almost ten CSR1000v-Routers and there’s no time to do it manually router-by-router.

The common process is as it has been for the last decades:

  • copy the new csr1000v-bin-File into the routers bootflash
  • verify the file
  • set the boot-variable
  • reboot

Upload BIN-File into the routers
There might be dozens of valid possibilities to get the bin-file into the router.

I prefer SCP (Secure Copy Protocol) since i uses the same firewall-rules as SSH so it’s unlikely that firewalls will disturb the update process.

  • i downloaded the bin-file using a windows-machine
  • i’ll use PSCP from the Putty-software-suite

Basics: Loop over a set of IPs in Windows Command-Shell?
That’s all:

C:> for %i in (235,241,240,239,236,237,238,242,243) do @echo %i
235
241
240
239
236
237
238
242
243

Let’s go


c:\Users\admin\Downloads>dir *.bin

 Verzeichnis von c:\Users\admin\Downloads

16.12.2017  17:44       365.660.728 csr1000v-universalk9.16.03.05.SPA.bin
               1 Datei(en),    365.660.728 Bytes
               0 Verzeichnis(se), 73.892.016.128 Bytes frei

c:\Users\admin\Downloads>for %i in (235,241,240,239,236,237,238,242,243) do @start pscp -2 -scp -l rmond -pw rmondpass csr1000v-universalk916.03.05.SPA.bin 192.168.2.%i:bootflash:csr1000v-universalk9.16.03.05.SPA.bin

This will initiate 9 parallel SCP-Filetransfers:

  • nobody said, this would improve the transfer speed 😉
  • i’ll do something else in the meantime
9x PSCP-File-Transfers

Verify the transferred images

import napalm
from easysnmp import Session
 
#credentials
DEVICE="192.168.2.235"
USER="rmond"
PASS="rmondpass"
SNMPRW="WRITE"
IOSFILE="bootflash:csr1000v-universalk9.16.03.05.SPA.bin"
IOSMD5="49922f08698284312379b4e0a2534bc2"
VERIFIED="Verified"

SNMPOIDReload="1.3.6.1.4.1.9.2.9.9.0"
SNMPOIDReloadVal=2
 
#instanciate NAPALM
iosdriver = napalm.get_network_driver('ios')
 
#connect to device
router = iosdriver(hostname=DEVICE, username=USER,  password=PASS, optional_args={'port': 22, 'dest_file_system': 'bootflash:'})
router.open()

#construct command to verify the integrity 
cliVerify=["verify /md5 "+IOSFILE+" "+IOSMD5]
result=router.cli(cliVerify)[cliVerify[0]]

Set the Bootvar and check, if it’s set

#%Error verifying 
#Verified
if (result.find(VERIFIED)>-1):
    print "(1) uploaded File: OK"
    cmdBootSystem="boot system flash bootflash:csr1000v-universalk9.16.03.05.SPA.bin"
    #push boot-system-command to router
    router.load_merge_candidate(config=cmdBootSystem)
    router.commit_config()

    cliShowBootvar=["show bootvar"]
    result=router.cli(cliShowBootvar)[cliShowBootvar[0]]
    #disconnet
    router.close()
    if (result.find("BOOT variable = "+IOSFILE)>-1):
        print "(2) boot-Variable set"
        print "=> Router "+DEVICE+" ready to reload"

Reload the Router using SNMP

        #snmp-server system-shutdown = 1.3.6.1.4.1.9.2.9.9.0 => Value 2 => Reload
        session = Session(hostname=DEVICE, community=SNMPRW, version=2)
        session.set(SNMPOIDReload,SNMPOIDReloadVal,"INTEGER")
else:
    #disconnet
    router.close()

The Router reboots

***
*** --- SHUTDOWN in 0:00:00 ---
*** Message from network to all terminals:
***
Null Message

Be patient.

W-DCFW#show ver | inc IOS.*Version
Cisco IOS XE Software, Version 16.03.05
Cisco IOS Software [Denali], CSR1000V Software (X86_64_LINUX_IOSD-UNIVERSALK9-M), Version 16.3.5, RELEASE SOFTWARE (fc1)

The new software-release is up and running.

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