Cisco 3750v2 VS 3850

Hi,
We are in the process of replacing an order for Cisco switch and we got an upgrade offer without extra cost from 3750 V2 to 3850,
1- Is there a technical comparison between the two models?
2- Our big concern is about stacking, how many is supported by 3750 v2 ( I think 9) and how many for 3850 ( Is it 4)?
It is a critical decison as we are talking about 100 unit
Your help is appreciated.
Mohamed

Hi Mohammed,
EOS and EOL: http://www.cisco.com/en/US/prod/collateral/switches/ps5718/ps5528/eos-eol-notice-c51-730227.html
The new 3850 series is replacing the 3750 series switches.  Have a look at below data sheet for different models with different options.
http://www.cisco.com/en/US/prod/collateral/switches/ps5718/ps12686/data_sheet_c78-720918.html
3750V2(Up to 9 units can be stacked together for a maximum of 468 10/100 ports)
3850 ( stacking Bandwidth 480G/ Max stacking member 9)
http://www.cisco.com/en/US/prod/collateral/switches/ps5718/ps12686/qa_c67-722110.html
Reagrds
Hope it helps.

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    Disclaimer
    The Author of this posting offers the information contained within this posting without consideration and with the reader's understanding that there's no implied or expressed suitability or fitness for any purpose. Information provided is for informational purposes only and should not be construed as rendering professional advice of any kind. Usage of this posting's information is solely at reader's own risk.
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    In no event shall Author be liable for any damages whatsoever (including, without limitation, damages for loss of use, data or profit) arising out of   the use or inability to use the posting's information even if Author has been advised of the possibility of such damage.
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    1. I heard that switches do not have an internal clock so is a poor device to be a centralized NTP master.
    2. I have also read that switches also have slow CPU processors that may lack the processing required.
    3. Its NTP sychronization will use external NTP servers which are resolved into IP addresses (e.g. pool.ntp.org). IP address can change. What other more reliable NTP sources are there?
    4. Any other thoughts and comments are most welcome.

    Firstly, DO NOT use the command "ntp master".  Cisco do not recommend using this commands because this will confuse the NTP propagation inside the network.  
    Next, all Cisco devices do not have a dedicated clock.  All appliances need to get SNTP/NTP time synch from somewhere.  This "somewhere" could either be a dedicated GPS-based NTP server and/or a time synch somewhere out in the internet.  
    You can also use the command "ntp update-calendar".  This new command allows appliances to take regular "snapshot" of the time and save it into the NVRAM.  In case there was a reboot or a power failure, the appliance's time is not too far away instead of waiting 5 to 10 minutes for SNTP/NTP to synch.

  • 3850 - auto qos voip cisco-phone

    I am having an issue where it appears that the "auto qos voip cisco-phone" command is marking down my voice packets COS and DSCP values to 0.  Anyone else notice this?  I am connecting Cisco 7945 phone to the interfaces with this command applied to the interface.  I verified that the IP Phone is sending COS = 5 and DSCP = ef to the switchport.  I verified the packets inbound to the switchport and the packets outbound as they transit to the destination IP Phone's switchport.

    Hi joshua,
    What is the IOS-XE version you are running on your 3850 ?
    Post your switchport configuration (7945 phone connected)
    Here is 3.3 QoS config guide & I noticed it says something like below qouted. So make sure this trust device command is there & your port is configured for standard VoIP port connectivity.(like voice vlan, etc)
    http://www.cisco.com/c/en/us/td/docs/switches/lan/catalyst3850/software/release/3se/consolidated_guide/configuration_guide/b_consolidated_3850_3se_cg/b_consolidated_3850_3se_cg_chapter_01101000.html#reference_8A1C35AB2874498F90C4F5600301BE9D
    "The trust device device_type interface configuration command is only supported in an auto-QoS configuration, and not as a stand-alone command on the switch. When using the trust device device_type interface configuration command in an auto-QoS configuration, if the connected peer device is not a corresponding device (defined as a device matching your trust policy), both CoS and DSCP values are set to "0" and any input policy will not take effect"
    HTH
    Rasika
    ***** Pls rate all useful responses ****

  • Unable to change boot file on Cisco 3850

    I was working on a Cisco 3850 24 port switch today and I read that it doesn't use the normal "boot system flash:XYZ.bin" but instead it's something like this:
    "software install file flash:XYZ.bin new"
    That changes the install package or something which makes it boot in the newly selected package which contains the new IOS.  Anyway, when i put in that command I get something about "Failed to ...." or something.  I'm sorry but I'm at home now and I don't have the device with me and it just occured to me to post this on the forum for possible help.  Either way, it's specifically says "Failed..." as the first word which is not what it should normally say.
    I used these directions:
    http://www.cisco.com/en/US/prod/collateral/switches/ps5718/ps12686/deployment_guide_c07-727067.html#wp9000169
    I am in Install mode.  Can anyone help me figure out why this is happening before my outage window on Sunday night?  I've downloaded the new version of the IOS from Cisco.com and verified it is currently located in the flash of this device. 
    Thanks for any help you can provide!

    Joshua,
    Plesae find quick guide on upgrading and booting, see below as a reference.
    Recovering from a 3850 boot failure.
    There are multiple reasons a 3850 may fail to boot correctly including a corrupt boot image, a corrupt packages.conf file, missing files, etc.  Below are a few different possible recovery methods to try.  I will also explain the two possible mode options, Install and bundle and why you might want to use one or the other.
    Install vs. Bundle Mode
    There are a few difference in the two modes, I would recommend reading over the config guide for more in-depth details. The recommended mode during operation is INSTALL mode because it allows for more features and requires fewer resources when booting.
    ++Install Mode
    This is the out-of-the-box mode that your switch will be in.  INSTALL mode uses a package provisioning file named packages.conf to boot the switch.
    If you happen to be in bundle mode upon boot, you can simply boot your switch in install mode by booting the software package provisioning file that resides in flash. If packages.conf doesn�t exist in flash, you need to expand the bundle into the flash file system by running
    Switch# software expand file flash: cat3k_caa-universalk9.SPA.03.02.02.SE.150-1.EX2.bin to flash:
    Once this completes, you will have all the needed files in flash. You can then change the boot statement to boot to packages.conf
    Switch#Config t
    Switch(config)# no boot system
    Switch(config): boot system switch all flash:packages.conf  (do not modify this file, unless necessary)
    Switch#write memory
    The provisioning file contains a list of software packages to boot, mount, and run. The ISO file system in each installed package is mounted to the root file system directly from flash.
    NOTE **Auto-upgrade is disabled, by default. (once in install mode - execute the following command in global config: software auto-upgrade enable )
    NOTE **Auto-upgrade includes an auto-copy process and an auto-extract process.
    ++Bundle Mode
    As noted previously, bundle mode consumes more memory than booting in install mode because the packages are extracted from the bundle and copied to the RAM.  If you decide to convert to bundle mode, you will first need to download the .bin file from CCO if you don�t already have it in flash.  Once in flash, you can simply change your boot statement to point to the (.bin) file:
    Switch#Config t
    Switch(config)# no boot system
    Switch(config): boot system switch all flash: cat3k_caa-universalk9.SPA.03.02.02.SE.150-1.EX2.bin
    Switch#write memory
    The provisioning file contained in a bundle is used to decide which packages to boot, mount, and run. Packages are extracted from the bundle and copied to RAM.
    NOTE **Auto install and smart install functionality is not supported in bundle boot mode.
    Recovery Methods
    USB
    The 3850 has a USB port on the front that can be used for both console access and also the ability to utilize a flash drive for image backup and recovery.
    If you happen to be stuck at the switch: prompt with a corrupt image or .conf file, you can easily boot to a file stored on the USB drive.
    1. Verify that the flashdrive is recognized and the .bin file exists
    switch: dir usbflash0:
    Directory of usbflash0:/
    74  -rw-  223734376  cat3k_caa-universalk9.SPA.03.02.02.SE.150-1.EX2.bin
    2. Boot to the USB image
    switch: boot usbflash0:cat3k_caa-universalk9.SPA.03.02.02.SE.150-1.EX2.bin
    Corrupt packages.conf
    I�ve seen instances in which packages.conf continually calls files that no longer exist in flash.  You can boot to an image from ROMMON just fine, however upon reload it will call packages.conf again and fail to boot.  If this happens, I recommend backing up the existing packages.conf file by renaming it or deleting all together.  NOTE: The previous step is mandatory as the next step will fail if a .conf file already exists.  You can then run an BUNDLE extract which will create a new packages.conf file.
    1. Once booted up (in BUNDLE mode) verify the files in flash
    Switch#dir flash:
    Directory of flash:/
    15500  -rwx        1243   Aug 1 2013 07:04:02 +00:00  packages.conf
    2. Copy or rename the existing packages.conf file
    Switch#cp flash:packages.conf flash:packages.conf.badop flash:packages.conf flash:packages.conf.bad
    Destination filename [packages.conf.bad]?
    Copy in progress...C
    1243 bytes copied in 0.140 secs (8879 bytes/sec)
    Switch#dir flash:
    Directory of flash:/
    15500  -rwx        1243   Aug 1 2013 07:04:02 +00:00  packages.conf
    15502  -rw-        1243   Aug 1 2013 11:53:51 +00:00  packages.conf.bad
    3. Delete packages.conf
    Switch#del flash:packages.conf
    Delete filename [packages.conf]?
    Delete flash:/packages.conf? [confirm]
    4. Expand BUNDLE to create new packages.conf
    Switch#software expand running switch 1 to flash:
    Preparing expand operation ...
    [1]: Expanding the running bundle
    [1]: Copying package files
    [1]: Package files copied
    [1]: Finished expanding the running bundle
    5. Verify boot
    Switch#show boot
    Switch 1
    Current Boot Variables:
    BOOT variable does not exist
    Boot Variables on next reload:
    BOOT variable = flash:packages.conf;
    Manual Boot = no
    Enable Break = no
    6. Reload Switch
    switch#reload
    Reload command is being issued on Active unit, this will reload the whole stack
    Proceed with reload? [confirm]
    Emergency Recovery
    If all else fails, the 3850 has a �trap door� method of recovering the system.  All you need is a terminal connected to the management port of the 3850 running a tftp server.  Download a valid image file from CCO and store it in the root of the tftp server.
    On the switch, you are most likely stuck at the switch: prompt.  If however you are in some sort of boot loop, you can use the �mode� button on the front of the switch to break the cycle.  Simply hold the button for roughly 10 seconds and the switch should react by breaking the cycle and stopping at a switch: prompt. The following steps will walk you through the recovery:
    1. Set the switch IP
    switch:  set IP_ADDR 192.0.2.123/255.255.255.0
    2. Set the default gateway
    switch: set DEFAULT_ROUTER 192.0.2.1
    3.Test connectivity by pinging terminal (that contains the tftp server)
    switch: ping 192.0.2.1
    ping 192.0.2.1 with 32 bytes of data ...
    Host 192.0.2.1 is alive.
    4. Verify that the emergency files exist in the switches file system
    switch: dir sda9:
    Directory of sda9:/
        2  drwx  1024       .
        2  drwx  1024       ..
       11  -rwx  18958824   cat3k_caa-recovery.bin
    36903936 bytes available (20866048 bytes used)
    5. Run the emergency install feature
    switch: emergency-install tftp://192.0.2.1/cat3k_caa-universalk9.SPA.03.02.02.SE.150-1.EX2.bin
    The bootflash will be erased during install operation, continue (y/n)?Y
    Starting emergency recovery (tftp://192.0.2.1/cat3k_caa-universalk9.SPA.03.02.02.SE.150-1.EX2.bin)...
    Reading full image into memory......................done
    Nova Bundle Image
    Kernel Address    : 0x6042f5d8
    Kernel Size       : 0x317ccc/3243212
    Initramfs Address : 0x607472a4
    Initramfs Size    : 0xdc6546/14443846
    Compression Format: .mzip
    Bootable image at @ ram:0x6042f5d8
    Bootable image segment 0 address range [0x81100000, 0x81b80000] is in range [0x80180000, 0x90000000].
    File "sda9:cat3k_caa-recovery.bin" uncompressed and installed, entry point: 0x811060f0
    Loading Linux kernel with entry point 0x811060f0 ...
    Bootloader: Done loading app on core_mask: 0xf
    ### Launching Linux Kernel (flags = 0x5)
    Initiating Emergency Installation of bundle tftp://192.0.2.1/cat3k_caa-universalk9.SPA.03.02.02.SE.150-1.EX2.bin
    Downloading bundle tftp://192.0.2.1/cat3k_caa-universalk9.SPA.03.02.02.SE.150-1.EX2.bin...
    Validating bundle tftp://192.0.2.1/cat3k_caa-universalk9.SPA.03.02.02.SE.150-1.EX2.bin...
    Installing bundle tftp://192.0.2.1/cat3k_caa-universalk9.SPA.03.02.02.SE.150-1.EX2.bin...
    Verifying bundle tftp://192.0.2.1/cat3k_caa-universalk9.SPA.03.02.02.SE.150-1.EX2.bin...
    Package cat3k_caa-base.SPA.03.02.02.SE.pkg is Digitally Signed
    Package cat3k_caa-drivers.SPA.03.02.02.SE.pkg is Digitally Signed
    Package cat3k_caa-infra.SPA.03.02.02.SE.pkg is Digitally Signed
    Package cat3k_caa-iosd-universalk9.SPA.150-1.EX2.pkg is Digitally Signed
    Package cat3k_caa-platform.SPA.03.02.02.SE.pkg is Digitally Signed
    Package cat3k_caa-wcm.SPA.10.0.111.0.pkg is Digitally Signed
    Preparing flash...
    Syncing device...
    Emergency Install successful... Rebooting
    Restarting system.
    Please let me know if you have any further questions.
    HTH
    Regards
    Inayath

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