Stacking of 3 switches?

when stacking of 3 switches in row?what will happen for the end nodes(pc,workstation) connected to 2nd unit (switch) of a stack when its port or hardware fails?
what are the main advantage?
it will share power only or
unit1
unit2
unit3

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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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Posting
If you're referencing physically stacked switch members, which function as one logical switch, there's no advantage to single homed hosts, beyond you might be able to repatch such to another stack member or replace the failed stacked member with less effort (i.e. faster).
The principle advantage, for hosts, is when they have links to different stack members in a Etherchannel configuration.  With that, there's more bandwidth to/from host and host doesn't lose  connectivity if just one port or stack member fails.
Regarding power sharing, yes some physical stacks allow that too.

Similar Messages

  • Ensure HA for servers on stacked Cisco 3750g Switches?

    Please bear with me. I'm fairly new to the sys admin world. Though I have a grasp on Cisco Switch technology, the grasp is certainly not solid. I've been tasked by my IT director with finding a device-level redundancy plan for our critical systems. We have four stacked 3750g switches. How would I setup the technology so if the switch with the servers connected were to fail, the downtime would be minimized? Should I deploy a RPS2300? What about the supervisor engine? From what I understand, the supervisor engine is virtual when using stacked 3750s. Is server NIC teaming neceassary? Does the LACP protocol need to be considered? As you can see, I've got a lot of catching up to do. Ultimately, I need guidance so I'm not this plan in the wrong direction by confusing appropriate technologies.
    Thanks in advance.

    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.
    Liability Disclaimer
    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.
    Posting
    You've already correctly identified some methods for HA with 3750s.
    As you note, the stack provides "supervisor" redundancy, i.e. if stack master fails, another stack member will take over.  One thing to watch for, if your stack master is running IP Services, you'll want at least one other stack member to have that IOS installed (and licensed).
    Regarding hosts, ideally if they support Etherchannel/Portchannel to the stack, you can have critical hosts connected to two different stack members, so if one path fails, connectivity isn't lost to the host.  For hosts that don't support that, or are not critical, you might have some "spare" VLAN ports in other stack members.  I.e. if a stack member fails, manually repatch such hosts to another stack member port.  (If fact, ideally, you might have one additional stack member already in the stack, so for such single connected hosts, downtime is the time it takes to repatch [then you work about replacing the failed stack member].)
    On the power issue, the RPS would allow usage of a secondary power circuit and it also covers, I believe, failure of a stack member's A/C power supply (those don't fail too often, and if it does on a 3750G, you might need to replace the whole unit[?]).  However, the RPS doesn't handle loss of A/C power on both paths (and when it takes over, I also recall, you need to reload the stack to revert off it).  So, you might also want to consider UPS too (if other parts of the network might still be operational).  Depending how you implement UPS, you might not need an RPS, for example if each stack member had its own UPS and each UPS could be reconnected to another power line.
    PS:
    For additional stability, if not already running it, 12.2(55)SE8 is considered, by many, as being very stable.

  • CISCO 3750X stacking for 5 switches , only 4 switches are coming in stack

    Dear All,
    I have 5 cisco 3750X switches ,but only 4 switches coming up 5 switches i am unable to see .
    Connection for the switch :Please find the attached snapshot for the stack data connection .
    Also find the snapshot for the stack power connection .
    Please provide your assistance and support to overcome this issue .

    Dear Marvin,
    Thanks for your reply.
    is my connection provided in attachment for data stack are ok .
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             cat -- Concatenate (type) file(s)
            copy -- Copy a file
          delete -- Delete file(s)
             dir -- List files in directories
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          format -- Format a filesystem
            fsck -- Check filesystem consistency
            help -- Present list of available commands
          memory -- Present memory heap utilization information
        mgmt_clr -- clear management port statistics
       mgmt_init -- initialize management port
       mgmt_show -- show management port statistics
           mkdir -- Create dir(s)
            more -- Concatenate (display) file(s)
            ping -- Send ICMP ECHO_REQUEST packets to a network host
          rename -- Rename a file
           reset -- Reset the system
           rmdir -- Delete empty dir(s)
             set -- Set or display environment variables
          set_bs -- Set attributes on a boot sector filesystem
       set_param -- Set system parameters in flash
           sleep -- Pause (sleep) for a specified number of seconds
            type -- Concatenate (type) file(s)
           unset -- Unset one or more environment variables
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  • Multiple VLAN's and relaying DHCP on two stacked SGE2000-G5 Switches

    We have been set the task of securing a small managed office system which is currently set up with a standard switch allowing each of the offices (containing different companies) to see each other, and in some cases, access each others documents across the network.
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  • Power Redundancy problem for cisco 3750 stack switches

    Hi Team,
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    Power Stack           Stack   Stack    Total   Rsvd    Alloc   Unused  Num  Num
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    Powerstack-2          SP-PS   Stndaln  700     477     223     0       1    2
    Powerstack-1          SP-PS   Stndaln  700     477     223     0       1    2
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        Stack topology: Standalone
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            Power budget: 223
            Power allocated: 223
            Low port priority value: 22
            High port priority value: 13
            Switch priority value: 4
            Port 1 status: Not connected
            Port 2 status: Not connected
            Neighbor on port 1: 0000.0000.0000
            Neighbor on port 2: 0000.0000.0000
    Power stack name: Powerstack-1
        Stack mode: Power sharing
        Stack topology: Standalone
        Switch 1:
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            Power allocated: 223
            Low port priority value: 22
            High port priority value: 13
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    Cosmetic bug
    CSCui21029    3750X Stack no standalone stays in running configureation as standalone
    Symptom:
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    stack-power switch 2
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    Conditions:
    3750X stacks with any license level
    Workaround:
    none

  • Is it possible to get logs from a 3850 Cisco member switch in a stack?

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    HI,
    create a internal with type of the structure and populate values into that n do wat ever u want.
    ex:
    data: itab type zstruct occurs 0 with header line. // where zstruct is a structure in a database.
    select * from .............. into table itab where ...............
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    write:/10 itab-fld1,
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    if helpful reward some points.
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  • Switch 2 was removed from stack unexpectedly and again joined stack

    Hello,
    we have 2  switches in stack, last night switch 2 was removed from stack and got rebooted and again it got back in stack.
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    *Apr  9 02:49:19.482 IST: %STACKMGR-5-SWITCH_READY: Switch 1 is READY (Cochin-GMSC-SWTCH-2)
    *Apr  9 02:49:19.818 IST: %STACKMGR-5-MASTER_READY: Master Switch 1 is READY (Cochin-GMSC-SWTCH-2)
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    *Apr  9 02:49:20.178 IST: %LINEPROTO-5-UPDOWN: Line protocol on Interface Loopback999, changed state to up (Cochin-GMSC-SWTCH-2)
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    Cisco IOS Software, C3750E Software (C3750E-UNIVERSALK9-M), Version 12.2(44)SE2, RELEASE SOFTWARE (fc2) (Cochin-GMSC-SWTCH-2)
    Copyright (c) 1986-2008 by Cisco Systems, Inc. (Cochin-GMSC-SWTCH-2)
    Compiled Thu 01-May-08 15:00 by antonino (Cochin-GMSC-SWTCH-2)
    Apr  9 02:49:24.222 IST: %LINK-3-UPDOWN: Interface GigabitEthernet2/0/1, changed state to up
    Apr  9 02:49:24.264 IST: %LINK-3-UPDOWN: Interface GigabitEthernet2/0/3, changed state to up
    Apr  9 02:49:24.281 IST: %LINK-3-UPDOWN: Interface GigabitEthernet2/0/4, changed state to up
    Apr  9 02:49:24.314 IST: %LINK-3-UPDOWN: Interface GigabitEthernet2/0/5, changed state to up
    Apr  9 02:49:25.228 IST: %LINEPROTO-5-UPDOWN: Line protocol on Interface GigabitEthernet2/0/1, changed state to up
    Apr  9 02:49:25.270 IST: %LINEPROTO-5-UPDOWN: Line protocol on Interface GigabitEthernet2/0/3, changed state to up
    Apr  9 02:49:25.287 IST: %LINEPROTO-5-UPDOWN: Line protocol on Interface GigabitEthernet2/0/4, changed state to up
    Apr  9 02:49:25.321 IST: %LINEPROTO-5-UPDOWN: Line protocol on Interface GigabitEthernet2/0/5, changed state to up
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    Apr  9 02:49:42.106 IST: %PLATFORM-6-MODULE_INSERTED: TwinGig Converter module inserted in slot 2 in Switch 2 (Cochin-GMSC-SWTCH-2)
    Switch 02
    Switch Uptime                   : 5 hours, 38 minutes
    Base ethernet MAC Address       : 00:23:04:19:9A:00
    Motherboard assembly number     : 73-10313-11
    Motherboard serial number       : FDO12320AH4
    Model revision number           : A0
    Motherboard revision number     : A0
    Model number                    : WS-C3750E-24TD-SD
    Daughterboard assembly number   : 800-28590-01
    Daughterboard serial number     : FDO123305QU
    System serial number            : FDO1234V07K
    Top assembly part number        : 800-28443-01
    Top assembly revision number    : A0
    Version ID                      : V01
    CLEI Code Number                : COMVC00ARA
    Cisco IOS Software, C3750E Software (C3750E-UNIVERSALK9-M), Version 12.2(44)SE2, RELEASE SOFTWARE (fc2)
    Copyright (c) 1986-2008 by Cisco Systems, Inc.
    Compiled Thu 01-May-08 15:00 by antonino
    Image text-base: 0x00003000, data-base: 0x02000000
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    Regards
    Jatinder

    what is use of session 2 command ,is this service impacting command
    sh ver
    Cisco IOS Software, C3750E Software (C3750E-UNIVERSALK9-M), Version 12.2(44)SE2, RELEASE SOFTWARE (fc2)
    Copyright (c) 1986-2008 by Cisco Systems, Inc.
    Compiled Thu 01-May-08 15:00 by antonino
    Image text-base: 0x00003000, data-base: 0x02000000
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    System image file is "flash:c3750e-universalk9-mz.122-44.SE2/c3750e-universalk9-mz.122-44.SE2.bin"
    This product contains cryptographic features and is subject to United
    States and local country laws governing import, export, transfer and
    use. Delivery of Cisco cryptographic products does not imply
    third-party authority to import, export, distribute or use encryption.
    Importers, exporters, distributors and users are responsible for
    compliance with U.S. and local country laws. By using this product you
    agree to comply with applicable laws and regulations. If you are unable
    to comply with U.S. and local laws, return this product immediately.
    A summary of U.S. laws governing Cisco cryptographic products may be found at:
    http://www.cisco.com/wwl/export/crypto/tool/stqrg.html
    If you require further assistance please contact us by sending email to
    [email protected].
    License Level: ipbase
    License Type: Permanent
    Next reload license Level: ipbase
    cisco WS-C3750E-24TD (PowerPC405) processor (revision A0) with 0K/16376K bytes of memory.
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    Last reset from power-on
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    1 FastEthernet interface
    56 Gigabit Ethernet interfaces
    4 Ten Gigabit Ethernet interfaces
    The password-recovery mechanism is enabled.
    512K bytes of flash-simulated non-volatile configuration memory.
    Base ethernet MAC Address       : 00:22:BE:95:35:80
    Motherboard assembly number     : 73-10313-11
    Motherboard serial number       : FDO12340H8F
    Model revision number           : A0
    Motherboard revision number     : A0
    Model number                    : WS-C3750E-24TD-SD
    Daughterboard assembly number   : 800-28590-01
    Daughterboard serial number     : FDO123305LA
    System serial number            : FDO1234V07J
    Top Assembly Part Number        : 800-28443-01
    Top Assembly Revision Number    : A0
    Version ID                      : V01
    CLEI Code Number                : COMVC00ARA
    Hardware Board Revision Number  : 0x01
    Switch Ports Model              SW Version            SW Image
    *    1 30    WS-C3750E-24TD     12.2(44)SE2           C3750E-UNIVERSALK9-M
         2 30    WS-C3750E-24TD     12.2(44)SE2           C3750E-UNIVERSALK9-M
    Switch 02
    Switch Uptime                   : 1 day, 7 hours, 35 minutes
    Base ethernet MAC Address       : 00:23:04:19:9A:00
    Motherboard assembly number     : 73-10313-11
    Motherboard serial number       : FDO12320AH4
    Model revision number           : A0
    Motherboard revision number     : A0
    Model number                    : WS-C3750E-24TD-SD
    Daughterboard assembly number   : 800-28590-01
    Daughterboard serial number     : FDO123305QU
    System serial number            : FDO1234V07K
    Top assembly part number        : 800-28443-01
    Top assembly revision number    : A0
    Version ID                      : V01
    CLEI Code Number                : COMVC00ARA
    License Level                   : ipbase
    License Type                    : Permanent
    Next reboot licensing Level     : ipbase
    Configuration register is 0xF

  • 2960x - stack cables connected while switches power on. SFP ports - status unknown

    Connected 2960x uplink using SFP ports both stacks and all 4 ports worked good.
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    One stack SFP stayed up in switch 2, not master.  Completed reload - other SPF connected in switch 4/0/52
    Second stack no connection on either SFP, remote tech power cycled switches.
    After power cycle one SFP worked  in Master 1/0/52, other switches SFP ports show "unknown" when inserting SFP.
    Configured port 48 on stack with issue and connected second uplink just fine.
    Has anyone experienced this with the SFP's?
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    Looking for documentation on reccommending procedure for connecting stack cables while switches should be powered off or not.
    Thanks,

    Opened Cisco TAC case.  the following bug was found.
    the two different HBRN's below require 2 different IOS and they cannot be in same stack.
     https://tools.cisco.com/bugsearch/bug/CSCur56395
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    switch#remote command 2 sh ver | s Hardware Board
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    Switch : 3 : ------------ Hardware Board Revision Number  : 0x12
    switch#remote command 4 sh ver | s Hardware Board
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  • 2960X 15.0(2)EX5 Stack Bug? Master Switch Ports link in Orange, no spanning Tree

    Is anyone aware of a bug in version 15.0(2)EX5 for 2960X Switches that would cause a switch in the master role to stop linking in new ports in green (and passing traffic).  I have 2 2960X-48FPD-L Switches in a stack and whichever switch I designate master will only link new connections in orange and not pass traffic.  All ports linked in show up/up and can be seen in a show cdp neighbor but won't pass any other traffic. 
    If I unplug the Stacking cables both switches become masters and ports linked in green on the previous member switch stay green, but after it switches to master any new connections plugged in only link in orange. 
    If I switch priorities and reboot the problem switches to the new master switch and the problem goes away on the member switch.
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  • Ipbase to IP service License upgrade stack switches

    All
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    Lerner

    It seems that you should be able to download license to all the members and then from the master send command to make them boot with the new license. Don't forget to accept the EULA.
    https://supportforums.cisco.com/message/3345903
    Daniel Dib
    CCIE #37149

  • Use SNMP to monitor the power supply status of stacked switches

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    Sorry to refresh such an old topic - but I am stuck with exactly this: Monitoring power supplies of a stacked Cisco Catalyst 3750-E.
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    SNMPv2-SMI::enterprises.9.9.13.1.3.1.2.2006 = STRING: "SW#2, Sensor#1, GREEN "
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    SNMPv2-SMI::enterprises.9.9.13.1.3.1.3.2006 = Gauge32: 40
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    SNMPv2-SMI::enterprises.9.9.13.1.3.1.4.2006 = INTEGER: 59
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    SNMPv2-SMI::enterprises.9.9.13.1.4.1.3.2059 = INTEGER: 1
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    Model  WS-C3750E-48TD
    Firmware 12.2(37)SE1
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    mso-style-parent:"";
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