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  1. #1

    Foundry Bigiron: Duplicate gateway IP address

    Hi there,

    We are having some problems with a Foundry Bigiron 4000.

    The hardware config is as following:

    - Bigiron 4000 chassis
    - 2x B8GMR3-A management (active + standby)
    - 2x B24E

    Once every couple of days now, we get the following error in syslog:

    Code:
    2009-10-05 20:40:00	User.Warning	8x.xx.50.1	Oct  5 20:39:59 gateway IP: IP: Duplicate IP address 8x.xx.38.1 detected sent from MAC address 0004.d3ea.e200 interface 3/13, 1 packets, first packet received at time 1 days 20 hours 41 minutes 37 seconds  since bootup!
    2009-10-05 20:40:27	User.Warning	8x.xx.50.1	Oct  5 20:40:26 gateway IP: IP: Duplicate IP address 8x.xx.42.1 detected sent from MAC address 0004.c5ea.e200 interface 3/21, 1 packets, first packet received at time 1 days 20 hours 42 minutes 4 seconds  since bootup!
    2009-10-05 20:40:37	User.Warning	8x.xx.50.1	Oct  5 20:40:37 gateway IP: IP: Duplicate IP address 8x.xx.42.1 detected sent from MAC address 0004.c5e1.e200 interface 3/21, 1 packets, first packet received at time 1 days 20 hours 42 minutes 14 seconds  since bootup!
    2009-10-05 20:41:18	User.Warning	8x.xx.50.1	Oct  5 20:41:17 gateway IP: IP: Duplicate IP address 8x.xx.33.1 detected sent from MAC address 0004.c5ea.e200 interface 3/21, 1 packets, first packet received at time 1 days 20 hours 42 minutes 55 seconds  since bootup!
    2009-10-05 20:41:23	User.Warning	8x.xx.50.1	Oct  5 20:41:22 gateway IP: IP: Duplicate IP address 8x.xx.17.1 detected sent from MAC address 0004.c5e1.e200 interface 3/21, 1 packets, first packet received at time 1 days 20 hours 43 minutes 0 seconds  since bootup!
    2009-10-05 20:41:28	User.Warning	8x.xx.50.1	Oct  5 20:41:28 gateway IP: IP: Duplicate IP address 8x.xx.33.1 detected sent from MAC address 0004.c5e1.e200 interface 3/21, 1 packets, first packet received at time 1 days 20 hours 43 minutes 6 seconds  since bootup!
    2009-10-05 20:41:43	User.Warning	8x.xx.50.1	Oct  5 20:41:43 gateway IP: IP: Duplicate IP address 8x.xx.33.1 detected sent from MAC address 0004.d3ea.e200 interface 3/13, 1 packets, first packet received at time 1 days 20 hours 43 minutes 20 seconds  since bootup!
    2009-10-05 20:42:02	User.Warning	8x.xx.50.1	Oct  5 20:42:01 gateway IP: IP: Duplicate IP address 8x.xx.41.1 detected sent from MAC address 0004.d3ea.e200 interface 3/13, 1 packets, first packet received at time 1 days 20 hours 43 minutes 39 seconds  since bootup!
    
    ...... it goes on like this
    Because it is a live setup we didn't have a lot of time to try things out, so we just reloaded the router and all was normal again. Can someone please help us with this?

    Some relevant info from the router:

    Code:
      SW: Version 08.0.01tT53 Copyright (c) 1996-2004 Foundry Networks, Inc.
          Compiled on Mar 04 2009 at 22:12:06 labeled as B2R08001t
          (3856892 bytes) from Primary B2R08001t.bin
    
        Module                                 Status    Ports Starting MAC
    S1: B8GMR Fiber Management Module, SYSIF 2 M3, ACTIV   8   0004.806f.e200
    S2: B8GMR Fiber Management Module, SYSIF 2 M3, STAND   8   0004.806f.e200
    S3: B24E Copper Switch Module              OK         24   0004.806f.e200
    S4: B24E Copper Switch Module              OK         24   0004.806f.e200
    
    FastEthernet3/13 is up, line protocol is up
      Hardware is FastEthernet, address is 0004.806f.e200 (bia 0004.806f.e24c)
      Configured speed auto, actual 100Mbit, configured duplex fdx, actual fdx
      Member of L2 VLAN ID 2, port is untagged, port state is FORWARDING
      STP configured to ON, priority is level0, flow control enabled
      mirror disabled, monitor disabled
      Not member of any active trunks
      Not member of any configured trunks
      No port name
      MTU 1518 bytes, encapsulation ethernet
      300 second input rate: 246112 bits/sec, 29 packets/sec, 0.24% utilization
      300 second output rate: 36992 bits/sec, 52 packets/sec, 0.03% utilization
      143724 packets input, 160431719 bytes, 0 no buffer
      Received 1 broadcasts, 0 multicasts, 143723 unicasts
      0 input errors, 0 CRC, 0 frame, 0 ignored
      0 runts, 0 giants, DMA received 143724 packets, 0 jumbos
      176837 packets output, 20748665 bytes, 0 underruns
      Transmitted 69540 broadcasts, 2047 multicasts, 105250 unicasts
      0 output errors, 0 collisions, DMA transmitted 176837 packets, 0 jumbos
    
    vlan 2 name SWITCHES by port
     untagged ethe 1/2 to 1/3 ethe 2/2 to 2/3 ethe 3/1 to 3/24 ethe 4/10 ethe 4/12
     router-interface ve 2
    !
    
    ip route 8x.xx.17.0/24 null0
    ip route 8x.xx.33.0/24 null0
    ip route 8x.xx.38.0/24 null0
    ip route 8x.xx.41.0/24 null0
    ip route 8x.xx.42.0/24 null0
    
    interface ve 2
     ip address 8x.xx.17.1/24
     ip address 8x.xx.33.1/24
     ip address 8x.xx.38.1/24
     ip address 8x.xx.41.1/24
     ip address 8x.xx.42.1/24
    !
    Other VLAN's don't have any problems.

    Any help is highly appreciated!

  2. #2
    Join Date
    Mar 2003
    Location
    New Jersey
    Posts
    1,277
    Track down those mac addresses. They do match Foundry's vendor MAC but they differ from the Layer2 interface you listed. Either way, if those subnets are on one VE, they would have the same MAC address but your logs report 3 unique mac addresses.

    Do you have a trunk (LAG group) between another switch? Any strange STP topology?

  3. #3
    Quote Originally Posted by amc-james View Post
    Track down those mac addresses. They do match Foundry's vendor MAC but they differ from the Layer2 interface you listed. Either way, if those subnets are on one VE, they would have the same MAC address but your logs report 3 unique mac addresses.

    Do you have a trunk (LAG group) between another switch? Any strange STP topology?
    Thanks for your reply! Actually, one port was setup to use link-aggregation in the past. This port was disabled now.

    Code:
    interface ethernet 1/8
     disable
     link-aggregate passive
    !
    I just removed the link-aggregation option to be sure.

    We don't actively use STP in our network, but I think it is enabled by default. Maybe we can disable STP as soon as someone is on-site again in the datacenter

  4. #4
    Join Date
    Mar 2003
    Location
    New Jersey
    Posts
    1,277
    Ok, I wasn't actually suggesting disabling STP, just curious of its role in your network and if their was a possibility of a loop. Much to everyone's common response, STP is a good thing.

    One thing you might investigate, if you have other routers/switches in play, is unicast flooding. This URL will explain the theory, even though its from Cisco. http://www.cisco.com/en/US/products/...801d0808.shtml

  5. #5
    Join Date
    Oct 2009
    Location
    Tampa, Fl
    Posts
    22
    I haven't seen that issue before. I'll look into it.
    Vology offers a 5-Year Warranty on all Used & Refurbished Network Equipment
    Cisco / Juniper / Sonicwall / Brocade / more

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