Dual home at FEX or Host

The attached is the design I'd like to pursue when setting up a new data center network.  I want to use NIC teaming from servers and channel groups from routers and other network devices when connecting to the fabric extenders.  This document runs through a sample configuration and outlines creating a vPC between a server and the FEXs.  My question is, do I need to create a vPC for every server that is dual homed to the FEXs when using NIC teaming?  If so, is the only alternative to dual home the FEXs instead?
Thank you

If you are talking about figure 4 in the PDF, yes, you have to create vPC for every single server. The server in figure 4 is using LACP as channel protocol and both NIC are forwarding traffic (active/active).
If you are using active/standby, you don't need to create vPC.
HTH,
jerry

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    16 libSystem.B.dylib 0x00007fff82134168 pthreadwqthread + 353
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    16 libSystem.B.dylib 0x00007fff82134168 pthreadwqthread + 353
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    9 CoreFoundation 0x00007fff839e883d -[NSInvocation invoke] + 141
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    13 Foundation 0x00007fff853b9de4 -[__NSOperationInternal start] + 681
    14 Foundation 0x00007fff85498beb __doStart2 + 97
    15 libSystem.B.dylib 0x00007fff821562c4 dispatch_call_block_andrelease + 15
    16 libSystem.B.dylib 0x00007fff82134831 dispatch_workerthread2 + 239
    17 libSystem.B.dylib 0x00007fff82134168 pthreadwqthread + 353
    18 libSystem.B.dylib 0x00007fff82134005 start_wqthread + 13
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    18.01.11 10.22.02 [0x0-0x1d01d].com.apple.mail[290] Threw error #201 (XML parsing failure) in CreatePropertiesFromXMPData()
    18.01.11 10.22.02 [0x0-0x1d01d].com.apple.mail[290] Threw error #201 (XML parsing failure) in CreatePropertiesFromXMPData()
    18.01.11 10.22.02 [0x0-0x1d01d].com.apple.mail[290] Threw error #201 (XML parsing failure) in CreatePropertiesFromXMPData()
    18.01.11 10.26.19 iCal[9375] Calendaring data empty
    18.01.11 10.26.19 iCal[9375] Calendaring data empty
    18.01.11 10.31.18 iCal[9375] Calendaring data empty
    18.01.11 10.31.18 iCal[9375] Calendaring data empty
    18.01.11 10.32.29 ntpd[37] time reset +0.711608 s
    18.01.11 10.36.19 iCal[9375] Calendaring data empty
    18.01.11 10.36.19 iCal[9375] Calendaring data empty
    18.01.11 10.41.19 iCal[9375] Calendaring data empty
    18.01.11 10.41.19 iCal[9375] Calendaring data empty
    18.01.11 10.46.18 iCal[9375] Calendaring data empty
    18.01.11 10.46.18 iCal[9375] Calendaring data empty
    18.01.11 10.51.18 iCal[9375] Calendaring data empty
    18.01.11 10.51.18 iCal[9375] Calendaring data empty
    18.01.11 10.56.18 iCal[9375] Calendaring data empty
    18.01.11 10.56.18 iCal[9375] Calendaring data empty
    18.01.11 10.59.37 Mail[49738] Loaded Mail Act-On Bundle 2.1.9
    18.01.11 10.59.37 Mail[49738] Preferred Mailboxes Extra for Mail Act-On loaded (version 2.1.1)
    18.01.11 10.59.37 Mail[49738] MailTags Extra for Mail Act-On loaded (version 2.1.1)
    18.01.11 10.59.37 MAOSparkleHelper[49740] SparkleHelper Launched NSConcreteNotification 0x60b730 {name = NSApplicationDidFinishLaunchingNotification; object = <NSApplication: 0x6062d0>} Sparkle Version (null)

    I can´t belive that no one here is running a Mail server on Lion server that is accessable with imap using iOS devices!  Is mail server on Lion really that bad?

  • Dual homed FEX configuration

    Hi,
    Have a question on dual homes FEX's
    I have a FEX that's dual homed to 02 Nexus 5K'S
    Lets say my FEX is 150 and if I want to configure port 150/1/1 to vlan 100, do I need to login to both Nexus 5K's and configure the port 150/1/1 to vlan 100?
    OR Can config sync help
    Thanks
    stan

    This is the wrong forum for this topic, but I'll assist.
    Without configuration sync enabled, you would have to configure both Nexus 5K exactly the same for the FEX port before traffic will forward.
    Configuration sync would help you in only having to configure it once, but I have had mixed results using configuration sync so I tend not to use it in my deployments.

  • Can i host a site on mac os x server?

    hellow guys i need some help, this is my site http://www.inauzwa.com, can i use the mac os x lion server to host this site?
    thank you
    regards arnold gabriel
    cofounder @ http://www.inauzwa.com

    Short Answer: Yes
    Extended Answer: You should have some knowledge of Networks in order to make your site available to the General public if you are trying to host from home - for example you will need a paid service like what DynDNS.com offers - unless you happen to have two static IP's (which is possible to get if you are on cable internet with sufficient bandwidth and yes them 2 IP's would be adressable with only one modem).
    If you get DynDNS ... they explain pretty much everything u need to know to get things running.
    If you get two static IP's you can bind both IP's to your network adapter and then you would need to know a few things about DNS setup and configuration - if you do it properly you can host easily more than "just one" website.
    Technical prerequisites for "website". As long as your website is HTML or PHP/MySQL based u will have no problems at all (I used to administer a XServe Dual G5 Unit which was hosted / colocated in a professional data ceneter up until not to long ago) - unfortunately the last Server OS working on it was 10.5.8 ... then the support and updates stopped (Thanks by the way Apple Inc ... kindda ****** at you guys, that was a perfectly good 1U Rackmount Server)

  • Fex 1 Nexus 2148 to 2 Nexus 5010 problem?

    hi all
    I'm having trouble when fex(ing) 1 nexus 2000 to 2 nexus 5000.
    I've configured as dual home from 1 nexus 2k. But after success config, just 1 nexus 5k can see 48 port on it. other cannot see it and it showed as module offline
    Here's is results:
    N5K-01(config-if)# sh int e1/4 fex-intf
    Fabric           FEX
    Interface        Interfaces
    Eth1/4        
    N5K-01(config-if)#
    N5K-02# sh int e1/4 fex-intf
    Fabric           FEX
    Interface        Interfaces
    Eth1/4          Eth100/1/48   Eth100/1/47   Eth100/1/46   Eth100/1/45 
                     Eth100/1/44   Eth100/1/43   Eth100/1/42   Eth100/1/41 
                     Eth100/1/40   Eth100/1/39   Eth100/1/38   Eth100/1/37 
                     Eth100/1/36   Eth100/1/35   Eth100/1/34   Eth100/1/33 
                     Eth100/1/32   Eth100/1/31   Eth100/1/30   Eth100/1/29 
                     Eth100/1/28   Eth100/1/27   Eth100/1/26   Eth100/1/25 
                     Eth100/1/24   Eth100/1/23   Eth100/1/22   Eth100/1/21 
                     Eth100/1/20   Eth100/1/19   Eth100/1/18   Eth100/1/17 
                     Eth100/1/16   Eth100/1/15   Eth100/1/14   Eth100/1/13 
                     Eth100/1/12   Eth100/1/11   Eth100/1/10   Eth100/1/9  
                     Eth100/1/8    Eth100/1/7    Eth100/1/6    Eth100/1/5  
                     Eth100/1/4    Eth100/1/3    Eth100/1/2    Eth100/1/1
    ===============================
    N5K-01(config-if)# sh fex 100 detail
    FEX: 100 Description: FEX0100   state: Offline
      FEX version: 4.1(3)N2(1a) [Switch version: 4.1(3)N2(1a)]
      FEX Interim version: 4.1(3)N2(1a)
      Switch Interim version: 4.1(3)N2(1a)
      Extender Model: N2K-C2148T-1GE,  Extender Serial: JAF1405CKHC
      Part No: 73-12009-06
      Card Id: 70, Mac Addr: 00:0d:ec:fd:48:82, Num Macs: 64
      Module Sw Gen: 12594  [Switch Sw Gen: 21]
    pinning-mode: static    Max-links: 1
      Fabric port for control traffic: Eth1/4
      Fabric interface state:
        Eth1/4 - Interface Up. State: Active
      Fex Port        State  Fabric Port  Primary Fabric
           Eth100/1/1  Down      Eth1/4      Eth1/4
           Eth100/1/2  Down      Eth1/4      Eth1/4
           Eth100/1/3  Down      Eth1/4      Eth1/4
           Eth100/1/4  Down      Eth1/4      Eth1/4
           Eth100/1/5  Down      Eth1/4      Eth1/4
           Eth100/1/6  Down      Eth1/4      Eth1/4
           Eth100/1/7  Down      Eth1/4      Eth1/4
           Eth100/1/8  Down      Eth1/4      Eth1/4
           Eth100/1/9  Down      Eth1/4      Eth1/4
          Eth100/1/10  Down      Eth1/4      Eth1/4
          Eth100/1/11  Down      Eth1/4      Eth1/4
          Eth100/1/12  Down      Eth1/4      Eth1/4
          Eth100/1/13  Down      Eth1/4      Eth1/4
          Eth100/1/14  Down      Eth1/4      Eth1/4
          Eth100/1/15  Down      Eth1/4      Eth1/4
          Eth100/1/16  Down      Eth1/4      Eth1/4
          Eth100/1/17  Down      Eth1/4      Eth1/4
          Eth100/1/18  Down      Eth1/4      Eth1/4
          Eth100/1/19  Down      Eth1/4      Eth1/4
          Eth100/1/20  Down      Eth1/4      Eth1/4
          Eth100/1/21  Down      Eth1/4      Eth1/4
          Eth100/1/22  Down      Eth1/4      Eth1/4
          Eth100/1/23  Down      Eth1/4      Eth1/4
          Eth100/1/24  Down      Eth1/4      Eth1/4
          Eth100/1/25  Down      Eth1/4      Eth1/4
          Eth100/1/26  Down      Eth1/4      Eth1/4
          Eth100/1/27  Down      Eth1/4      Eth1/4
          Eth100/1/28  Down      Eth1/4      Eth1/4
          Eth100/1/29  Down      Eth1/4      Eth1/4
          Eth100/1/30  Down      Eth1/4      Eth1/4
          Eth100/1/31  Down      Eth1/4      Eth1/4
          Eth100/1/32  Down      Eth1/4      Eth1/4
          Eth100/1/33  Down      Eth1/4      Eth1/4
          Eth100/1/34  Down      Eth1/4      Eth1/4
          Eth100/1/35  Down      Eth1/4      Eth1/4
          Eth100/1/36  Down      Eth1/4      Eth1/4
          Eth100/1/37  Down      Eth1/4      Eth1/4
          Eth100/1/38  Down      Eth1/4      Eth1/4
          Eth100/1/39  Down      Eth1/4      Eth1/4
          Eth100/1/40  Down      Eth1/4      Eth1/4
          Eth100/1/41  Down      Eth1/4      Eth1/4
          Eth100/1/42  Down      Eth1/4      Eth1/4
          Eth100/1/43  Down      Eth1/4      Eth1/4
          Eth100/1/44  Down      Eth1/4      Eth1/4
          Eth100/1/45  Down      Eth1/4      Eth1/4
          Eth100/1/46  Down      Eth1/4      Eth1/4
          Eth100/1/47  Down      Eth1/4      Eth1/4
          Eth100/1/48  Down      Eth1/4      Eth1/4
    Logs:
    [11/24/2010 03:16:20.624283] Module register received
    [11/24/2010 03:16:20.627639] Registration response sent
    [11/24/2010 03:16:21.115021] Module Online Sequence
    [11/24/2010 03:16:22.379395] Module Online
    [11/24/2010 03:52:09.779773] Module disconnected
    [11/24/2010 03:52:09.781691] Offlining Module
    [11/24/2010 03:52:09.782231] Module Offline Sequence
    [11/24/2010 03:52:11.735462] Module Offline
    [11/24/2010 04:06:25.258659] Module disconnected
    [11/24/2010 04:06:25.259890] Offlining Module
    =================
    N5K-02# sh fex 100 detail
    FEX: 100 Description: FEX0100   state: Online
      FEX version: 4.1(3)N2(1a) [Switch version: 4.1(3)N2(1a)]
      FEX Interim version: 4.1(3)N2(1a)
      Switch Interim version: 4.1(3)N2(1a)
      Extender Model: N2K-C2148T-1GE,  Extender Serial: JAF1405CKHC
      Part No: 73-12009-06
      Card Id: 70, Mac Addr: 00:0d:ec:fd:48:82, Num Macs: 64
      Module Sw Gen: 12594  [Switch Sw Gen: 21]
    pinning-mode: static    Max-links: 1
      Fabric port for control traffic: Eth1/4
      Fabric interface state:
        Eth1/4 - Interface Up. State: Active
      Fex Port        State  Fabric Port  Primary Fabric
           Eth100/1/1  Down      Eth1/4      Eth1/4
           Eth100/1/2  Down      Eth1/4      Eth1/4
           Eth100/1/3  Down      Eth1/4      Eth1/4
           Eth100/1/4  Down      Eth1/4      Eth1/4
           Eth100/1/5  Down      Eth1/4      Eth1/4
           Eth100/1/6  Down      Eth1/4      Eth1/4
           Eth100/1/7  Down      Eth1/4      Eth1/4
           Eth100/1/8  Down      Eth1/4      Eth1/4
           Eth100/1/9  Down      Eth1/4      Eth1/4
          Eth100/1/10  Down      Eth1/4      Eth1/4
          Eth100/1/11  Down      Eth1/4      Eth1/4
          Eth100/1/12  Down      Eth1/4      Eth1/4
          Eth100/1/13  Down      Eth1/4      Eth1/4
          Eth100/1/14  Down      Eth1/4      Eth1/4
          Eth100/1/15  Down      Eth1/4      Eth1/4
          Eth100/1/16  Down      Eth1/4      Eth1/4
          Eth100/1/17  Down      Eth1/4      Eth1/4
          Eth100/1/18  Down      Eth1/4      Eth1/4
          Eth100/1/19  Down      Eth1/4      Eth1/4
          Eth100/1/20  Down      Eth1/4      Eth1/4
          Eth100/1/21  Down      Eth1/4      Eth1/4
          Eth100/1/22  Down      Eth1/4      Eth1/4
          Eth100/1/23  Down      Eth1/4      Eth1/4
          Eth100/1/24  Down      Eth1/4      Eth1/4
          Eth100/1/25  Down      Eth1/4      Eth1/4
          Eth100/1/26  Down      Eth1/4      Eth1/4
          Eth100/1/27  Down      Eth1/4      Eth1/4
          Eth100/1/28  Down      Eth1/4      Eth1/4
          Eth100/1/29  Down      Eth1/4      Eth1/4
          Eth100/1/30  Down      Eth1/4      Eth1/4
          Eth100/1/31  Down      Eth1/4      Eth1/4
          Eth100/1/32  Down      Eth1/4      Eth1/4
          Eth100/1/33  Down      Eth1/4      Eth1/4
          Eth100/1/34  Down      Eth1/4      Eth1/4
          Eth100/1/35  Down      Eth1/4      Eth1/4
          Eth100/1/36  Down      Eth1/4      Eth1/4
          Eth100/1/37  Down      Eth1/4      Eth1/4
          Eth100/1/38  Down      Eth1/4      Eth1/4
          Eth100/1/39  Down      Eth1/4      Eth1/4
          Eth100/1/40  Down      Eth1/4      Eth1/4
          Eth100/1/41  Down      Eth1/4      Eth1/4
          Eth100/1/42  Down      Eth1/4      Eth1/4
          Eth100/1/43  Down      Eth1/4      Eth1/4
          Eth100/1/44  Down      Eth1/4      Eth1/4
          Eth100/1/45  Down      Eth1/4      Eth1/4
          Eth100/1/46  Down      Eth1/4      Eth1/4
          Eth100/1/47  Down      Eth1/4      Eth1/4
          Eth100/1/48  Down      Eth1/4      Eth1/4
    Logs:
    [11/24/2010 03:49:38.824900] Module timed out
    [11/24/2010 03:54:08.225000] Module register received
    [11/24/2010 03:54:08.226093] Registration response sent
    [11/24/2010 03:54:08.540805] Module Online Sequence
    [11/24/2010 03:54:10.7287] Module Online
    Anyone can help me with this?
    Thanks.

    I already configured vPC between 2 Nexus 5010
    N5K-01# sh vpc brief
    Legend:
                    (*) - local vPC is down, forwarding via vPC peer-link
    vPC domain id                   : 1  
    Peer status                     : peer adjacency formed ok     
    vPC keep-alive status           : peer is alive                
    Configuration consistency status: success
    vPC role                        : primary                     
    vPC Peer-link status
    id   Port   Status Active vlans   
    1    Po1    up     1                                                      
    vPC status
    id     Port        Status Consistency Reason                     Active vlans
    100    Po100       down   success     success                    - 
    N5K-02# sh vpc
    Legend:
                    (*) - local vPC is down, forwarding via vPC peer-link
    vPC domain id                   : 1  
    Peer status                     : peer adjacency formed ok     
    vPC keep-alive status           : peer is alive                
    Configuration consistency status: success
    vPC role                        : secondary                   
    vPC Peer-link status
    id   Port   Status Active vlans   
    1    Po1    up     1                                                      
    vPC status
    id     Port        Status Consistency Reason                     Active vlans
    100    Po100       down*  success     success                    -        
    N5K-02#
    may i miss some config ?

  • %SW_MATM-4-MACFLAP_NOTIF: Host 00ff.ffff.ffff in vlan 112 is flapping between port Gi3/0/1 and port Fa2/0/46.....

    Hi Guys,
    Iam seeing above issue on two of my switches connected to core switch ....i know there are quite of few discussion open on same issue but mine is diff....
    i see same issue on two switches connected via core swicth on same vlan ( 112)....when i do mac address lookup it says the mac thats generating this error is invalid so cant track the source of this mac....also just saw on topoogy change notification on core traced it back to originating switch which is also generating this error but dnt see any change on the switch that is generated topology change notification....prob is vlan 112 all interface on both switches conected via core are generating this message so five interfaces each .....any expert advise on how to approach it as i cant get to source port generating this as nearly five ports in vlan 112 on bloth switches generating this error. thanks
    Apr 15 15:56:08: %SW_MATM-4-MACFLAP_NOTIF: Host 00ff.ffff.ffff in vlan 112 is flapping between port Fa3/0/46 and port Gi3/0/1
    Apr 15 15:56:50: %SW_MATM-4-MACFLAP_NOTIF: Host 00ff.ffff.ffff in vlan 112 is flapping between port Fa2/0/46 and port Gi3/0/1
    Apr 15 15:56:51: %SW_MATM-4-MACFLAP_NOTIF: Host 00ff.ffff.ffff in vlan 112 is flapping between port Fa3/0/46 and port Gi3/0/1
    Apr 15 15:58:29: %SW_MATM-4-MACFLAP_NOTIF: Host 00ff.ffff.ffff in vlan 112 is flapping between port Fa2/0/46 and port Gi3/0/1
    Apr 15 15:59:27: %SW_MATM-4-MACFLAP_NOTIF: Host 00ff.ffff.ffff in vlan 112 is flapping between port Gi3/0/1 and port Fa2/0/46
    Apr 15 15:59:45: %SW_MATM-4-MACFLAP_NOTIF: Host 00ff.ffff.ffff in vlan 112 is flapping between port Fa2/0/46 and port Gi3/0/1
    Apr 15 16:00:14: %SW_MATM-4-MACFLAP_NOTIF: Host 00ff.ffff.ffff in vlan 112 is flapping between port Gi3/0/1 and port Fa3/0/46
    Apr 15 16:00:36: %SW_MATM-4-MACFLAP_NOTIF: Host 00ff.ffff.ffff in vlan 112 is flapping between port Fa2/0/46 and port Gi3/0/1
    Apr 15 16:02:40: %SW_MATM-4-MACFLAP_NOTIF: Host 00ff.ffff.ffff in vlan 112 is flapping between port Fa3/0/46 and port Gi3/0/1
    Apr 15 16:03:22: %SW_MATM-4-MACFLAP_NOTIF: Host 00ff.ffff.ffff in vlan 112 is flapping between port Fa3/0/46 and port Gi3/0/1
    Apr 15 16:03:31: %SW_MATM-4-MACFLAP_NOTIF: Host 00ff.ffff.ffff in vlan 112 is flapping between port Gi3/0/1 and port Fa2/0/46
    Apr 15 16:04:03: %SW_MATM-4-MACFLAP_NOTIF: Host 00ff.ffff.ffff in vlan 112 is flapping between port Fa3/0/46 and port Gi3/0/1
    Apr 15 16:04:34: %SW_MATM-4-MACFLAP_NOTIF: Host 00ff.ffff.ffff in vlan 112 is flapping between port Fa2/0/46 and port Gi3/0/1
    Apr 15 16:04:41: %SW_MATM-4-MACFLAP_NOTIF: Host 00ff.ffff.ffff in vlan 112 is flapping between port Gi3/0/1 and port Fa2/0/46
    Apr 15 16:05:05: %SW_MATM-4-MACFLAP_NOTIF: Host 00ff.ffff.ffff in vlan 112 is flapping between port Fa2/0/46 and port Gi3/0/1
    Apr 15 16:05:13: %SW_MATM-4-MACFLAP_NOTIF: Host 00ff.ffff.ffff in vlan 112 is flapping between port Gi3/0/1 and port Fa3/0/46
    sh spanning-tree vlan 112
    VLAN0112
      Spanning tree enabled protocol rstp
      Root ID    Priority    8192
                 Address     001e.13c1.5a70
                 Cost        3004
                 Port        109 (GigabitEthernet3/0/1)
                 Hello Time   2 sec  Max Age 20 sec  Forward Delay 15 sec
      Bridge ID  Priority    49264  (priority 49152 sys-id-ext 112)
                 Address     001f.261c.1d80
                 Hello Time   2 sec  Max Age 20 sec  Forward Delay 15 sec
                 Aging Time 300
      UplinkFast enabled but inactive in rapid-pvst mode
    Interface        Role Sts Cost      Prio.Nbr Type
    Fa2/0/46         Desg FWD 3019      128.104  P2p
    Fa1/0/46         Desg FWD 3019      128.50   P2p
    Gi3/0/1          Root FWD 3004      128.109  P2p
    Fa3/0/46         Desg FWD 3019      128.158  P2p
    Fa3/0/47         Desg FWD 3100      128.159  P2p
    Fa3/0/48         Desg FWD 3019      128.160  P2p

    ASAK Mohammed,
    There are lots of thread discussing about this, you should do a search before creating a new post.
    Anyway, this is how you approach these types of flapping:
    1. Is the the given MAC flapping in the log flapping only 1 time or you see it multiple times over a reasonobly short time?
       If you see it only once or once every 2-3 hours this might be not an  issue worth being investigated. Sporadic one time flapping are expected  in L2 broadcast domain.
    If you see it often continue to step 2.
    2. Identify and locate the flapping mac in vlan 125: 3270.990a.a504
    Is  the mac of a dual-homes server using some kind of load balancing  algorithm (active/active) for which the same address is used from both  NICs?
    If yes, the message is not and issue but just an indication.  Fix this type of LB (make it active/standby or make sure the server  uses 2 different mac addresses, one per NIC) or if it is not possible  leave it like this.
    3. Is the MAC a the wireless NIC of a PC?
    Make sure that the user was not moving from one AP to another (flapping is normal in this case)
    4.
    See if you have increasing TCN's and check if they are coming from the same interface.
    From  this point on you keep on troubleshooting STP until you find the  offending link (likely going up and down) or the switch. You also need  to check if STP in vlan112 is coherent with the actual L2 topology you  have.
    =====================================================
    2- Some more details information which might be helpfull to you.
    http://www.cisco.com/en/US/products/hw/switches/ps663/products_tech_note09186a
    00801434de.shtml#subtopic1k
    Problem
    The switch generates %SYS-3-P2_ERROR: Host xx:xx:xx:xx:xx:xx is flapping
    between ports? messages, where xx:xx:xx:xx:xx:xx is a MAC address.
    Description
    This example shows the console output that you see when this error occurs:
    %SYS-4-P2_WARN: 1/Host 00:50:0f:20:08:00 is flapping between port 1/2 and port
    4/39
    Use the steps and guidelines in this section in order to understand and
    troubleshoot the cause of this error message.
    The message indicates that your Catalyst 4500/4000 switch has learned a MAC
    address that already exists in the content-addressable memory (CAM) table, on
    a port other than the original one. This behavior repeatedly occurs over short
    periods of time, which means that there is address flapping between ports..
    If the message appears for multiple MAC addresses, the behavior is not normal.
    This behavior indicates a possible network problem because the MAC addresses
    move quickly from one port to another port before the default aging time. The
    problem can be looping traffic on the network. Typical symptoms include:
    ·        High CPU utilization
    ·        Slow traffic throughout the network
    ·        High backplane utilization on the switch
    For information on how to identify and troubleshoot issues with spanning tree,
    refer to Spanning Tree Protocol Problems and Related Design Considerations
    <http://www.cisco.com/en/US/tech/tk389/tk621/technologies_tech_note09186a00800
    951ac.shtml> .
    If the error message appears for one or two MAC addresses, locate these MAC
    addresses in order to determine the cause. Issue the show cam mac_addr command
    in order to identify from where these MAC addresses have been learned. In this
    command, mac_addr is the MAC address that the error reports as flapping.
    After you determine between which ports this MAC address is flapping, track
    down the MAC address. Connect to the intermediate devices between your
    Catalyst 4500/4000 and the device that has the problem MAC address. Do this
    until you are able to identify the source and how this device connects to the
    network.
    Note: Because the MAC address is flapping between two ports, track down both
    of the paths.
    This example shows how to track both of the paths from which this MAC address
    has been learned:
    Note: Assume that you have received this message and you have begun to
    investigate it.
    %SYS-4-P2_WARN: 1/Host 00:50:0f:20:08:00 is flapping between port 1/2 and port
    4/39
    In order to track down how this MAC address was learned from both ports,
    complete these steps:
    1.     Consider port 1/2 first, and issue the show cam dynamic 1/2 command.
    If you see the MAC address 00:50:0f:20:08:00 in the list of the MAC addresses
    that have been learned on this port, determine if this is a single host that
    is connected or if there are multiple hosts that are registered on that port.
    2.     On the basis of whether there is a single or multiple hosts,
    investigate the device:
    o   If there is a single host (00:50:0f:20:08:00) that is connected, check the
    other port that is registered and see if the host is dually attached to the
    switch.
    In this example, the other port is port 4/39.
    o   If the host has connections to other devices that can eventually lead back
    to this switch, try to track down the intermediate devices.
    With Cisco devices, issue the show cdp neighbors mod/port detail command. The
    output provides information about intermediate devices.
    Here is sample output:
    Cat4K> (enable) show cdp neighbors 1/2 detail
    Port (Our Port): 1/2
    Device-ID: brigitte
    Device Addresses:
    IP Address: 172.16.1.1
    Novell address: aa.0
    Holdtime: 171 sec
    Capabilities: ROUTER
    Version:
    Cisco Internetwork Operating System Software
    IOS (tm) 2500 Software (C2500-JS-L), Version 12.0(7)T,  RELEASE SOFTWARE (fc2)
    Copyright (c) 1986-1999 by cisco Systems, Inc.
    Compiled Mon 06-DEC-99 17:10 by phanguye
    Platform: cisco 2500
    Port-ID (Port on Neighbors's Device): Ethernet0
    VTP Management Domain: unknown
    Native VLAN: unknown
    Duplex: half
    System Name: unknown
    System Object ID: unknown
    Management Addresses: unknown
    Physical Location: unknown
    Cat4K> (enable)
    3.     Establish a Telnet session with the device and follow the path of the
    MAC address.
    In this example, the IP address is 172.16.1.1.
    Repeat the procedure for all MAC addresses that the error message reports as
    flapping.
    4.     Create a simple diagram of the source device with that MAC address and
    of the physical connections (the Catalyst 4500/4000 ports) from which and to
    which this MAC address is flapping.
    The diagram enables you to determine if this is a valid port and path for your
    network layout.
    If you verify that both ports on which the MAC address is flapping provide a
    path toward that network node, there is a possibility that you have a
    spanning-tree failure issue. Refer to Spanning Tree Protocol Problems and
    Related Design Considerations
    <http://www.cisco.com/en/US/tech/tk389/tk621/technologies_tech_note09186a00800
    951ac.shtml>  in order to isolate and troubleshoot this loop.
    In large networks in which multiple hosts from multiple vendors are
    interconnected, difficulty arises as you try to track down the host with use
    of just the MAC address. Use the search utility for the IEEE OUI and
    Company_id Assignments <http://standards.ieee.org/regauth/oui/index.shtml>  in
    order to track down these MAC addresses. This list is the front end of the
    database where IEEE has registered all MAC addresses that have been assigned
    to all vendors. Enter the first three octets of the MAC address in the Search
    for: field of this page in order to find the vendor that is associated with
    this device. The first three octets in the example are 00:50:0f.
    These are other issues that can cause this message to appear:
    ·        Server NIC redundancy problem?There is a server with a dual-attached
    NIC that misbehaves and does not follow the standards. The server uses the
    same MAC address for both ports that connect to the same switch.
    ·        Hot Standby Router Protocol (HSRP) flapping?Flapping HSRP can cause
    these messages to appear in the Supervisor Engine console. If you notice that
    HSRP implementation in your network is unstable, refer to Understanding and
    Troubleshooting HSRP Problems in Catalyst Switch Networks
    <http://www.cisco.com/en/US/tech/tk648/tk362/technologies_tech_note09186a00800
    94afd.shtml>  in order to resolve the problem.
    ·        EtherChannel misconfiguration?A misconfigured EtherChannel connection
    can also cause these symptoms. If ports that the flapping message reports are
    members of the same channel group, check your EtherChannel configuration and
    refer to Understanding EtherChannel Load Balancing and Redundancy on Catalyst
    Switches
    <http://www.cisco.com/en/US/tech/tk389/tk213/technologies_tech_note09186a00800
    94714.shtml>  in order to troubleshoot the configuration.
    ·        Host reflects packets back onto the network?The reflection of packets
    back onto the network by a host can also cause flapping. Typically, the root
    cause of this packet reflection is a broken NIC or any failure of the physical
    interface of the host that is connected to the port.
    If the reflection of packets by the host is your root cause, obtain a sniffer
    trace and examine the traffic that goes to and from the ports on which the
    messages have appeared. If a host reflects packets, you typically see
    duplicate packets in the trace. The duplicate packets are a possible symptom
    of this flapping of the MAC address.
    Refer to Configuring SPAN and RSPAN
    <http://www.cisco.com/en/US/docs/switches/lan/catalyst4000/6.3and6.4/configura
    tion/guide/span.html>  for details on how to configure a port for use with a
    sniffer.
    ·        Software or hardware defect?If you have tried to troubleshoot the
    flapping message with the instructions in this section but you still notice
    the issue, seek further assistance from Cisco Technical Support
    <http://www.cisco.com/en/US/support/tsd_cisco_worldwide_contacts.html> . Be
    sure to mention and provide documentation of the information that you have
    collected while you followed the steps. This information makes further
    troubleshooting quicker and more efficient.
    HTH
    REgards
    Inayath
    *Plz rate all usefull posts.

  • Fabricpath with FEX topology

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    Simens,
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