Wireless Bridge (1310-based) issues

Discussion in 'Cisco' started by Harkin, Jul 1, 2005.

  1. Harkin

    Harkin Guest

    I have the following setup-

    4510 <-> 1310Bridge1 <-> 1310Bridge2 <-> 2950

    I have no errors for the interface on the 4510 that is connected to bridge
    1. I show no errors for the Ethernet connection on Bridge1, but there are an
    immense amount of Output errors on the wireless side. If I look at the
    detailed stats, on the receive side there are a lot of CRC and Header CRC
    errors. On the transmit side there are a alot of "Packets with one retry"
    and about 6 times that amount of "Packets with more than one retry".

    On Bridge2, on the receive side there are also a ton of CRC and Header CRC
    errors, and the tx values for the retry packets is reversed from that of
    Bridge1. They both also have high values for 'Protocol Defers' and 'Energy
    Detect Defers'.

    On the 2950 connection interface, there are a few CRC and frame errors. The
    percentage is negligable compared to the total amount of traffic.

    It seems that the two radios are not talking correctly to each other,
    however I am not really sure what to look for to correct it. I looked
    through the setup and nothing really jumped out at me. Thoughts?
     
    Harkin, Jul 1, 2005
    #1
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  2. Harkin

    Chris_D Guest

    Coming at this from a slightly diferent angle and working under the
    impression that the wireless side of the connection is only half
    duplex, this looks like the sort of thing you may see from an
    incorreclty configured switch port.

    IE : I would expect to see this sort of thing if a PC with a NIC set
    to full/100 was connected to a switchport set to half/10

    I would check the settings on the switchports and the bridge ethernet
    ports and if that doesn't throw anything up, have a look at the type
    of packets travering the WLAN.

    You could also try getting a capture of what is going on with ethereal
    or summit similar ?

    Hope this helps ..



    On Fri, 1 Jul 2005 15:35:38 -0500, "Harkin"
    <> wrote:

    >I have the following setup-
    >
    >4510 <-> 1310Bridge1 <-> 1310Bridge2 <-> 2950
    >
    >I have no errors for the interface on the 4510 that is connected to bridge
    >1. I show no errors for the Ethernet connection on Bridge1, but there are an
    >immense amount of Output errors on the wireless side. If I look at the
    >detailed stats, on the receive side there are a lot of CRC and Header CRC
    >errors. On the transmit side there are a alot of "Packets with one retry"
    >and about 6 times that amount of "Packets with more than one retry".
    >
    >On Bridge2, on the receive side there are also a ton of CRC and Header CRC
    >errors, and the tx values for the retry packets is reversed from that of
    >Bridge1. They both also have high values for 'Protocol Defers' and 'Energy
    >Detect Defers'.
    >
    >On the 2950 connection interface, there are a few CRC and frame errors. The
    >percentage is negligable compared to the total amount of traffic.
    >
    >It seems that the two radios are not talking correctly to each other,
    >however I am not really sure what to look for to correct it. I looked
    >through the setup and nothing really jumped out at me. Thoughts?
    >


    Drop the ZZZ to reply

    Cheers ...
     
    Chris_D, Jul 2, 2005
    #2
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  3. Harkin

    Benrand Guest

    On Fri, 1 Jul 2005 15:35:38 -0500, "Harkin"
    <> wrote:

    >I have the following setup-
    >
    >4510 <-> 1310Bridge1 <-> 1310Bridge2 <-> 2950
    >
    >I have no errors for the interface on the 4510 that is connected to bridge
    >1. I show no errors for the Ethernet connection on Bridge1, but there are an
    >immense amount of Output errors on the wireless side. If I look at the
    >detailed stats, on the receive side there are a lot of CRC and Header CRC
    >errors. On the transmit side there are a alot of "Packets with one retry"
    >and about 6 times that amount of "Packets with more than one retry".


    Try shortening the MTU. I think it may be called fragmentation in the
    config, but I'm not sure.

    You should expect to see those types of errors, especially if the
    airspace is packed with other 802.11 devices or you have other
    interference issues.




    >
    >On Bridge2, on the receive side there are also a ton of CRC and Header CRC
    >errors, and the tx values for the retry packets is reversed from that of
    >Bridge1. They both also have high values for 'Protocol Defers' and 'Energy
    >Detect Defers'.
    >
    >On the 2950 connection interface, there are a few CRC and frame errors. The
    >percentage is negligable compared to the total amount of traffic.
    >
    >It seems that the two radios are not talking correctly to each other,
    >however I am not really sure what to look for to correct it. I looked
    >through the setup and nothing really jumped out at me. Thoughts?
    >
     
    Benrand, Jul 26, 2005
    #3
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