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Slow link (with blinking Amber Light) between Cisco Switches

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  • Slow link (with blinking Amber Light) between Cisco Switches

    Hello,
    I have a Cisco WS-C2950SX-24 Layer 2 switch (Switch A) that is connected to a WS-C2924C-XL Layer 2 switch (Switch B). The connection is set up as a trunk link between the two.
    The problems are that all traffic on switch A that needs to connect through switch B is extremely slow; almost like everything is working at 10Mps instead of 100Mbs. In addition, switch A has a blinking amber light on the port that connects to switch B. I have even changed the port but the problem persists. I have verified that the port settings (encapsulation for the trunk, speed, duplex, etc.) are the same on both ends.
    Note that there are no problems on switch B; all traffic is fine on that switch.
    Attached are the configuration files for switch A and switch B. Port 0/17 on switch A is connected to port 0/24 on switch B.
    What may be the problem?
    Thank you for your time.
    Regards,
    Christopher Kurtis Koeber
    Attached Files

  • #2
    Re: Slow link (with blinking Amber Light) between Cisco Switches

    A blinking amber LED means there is an error or the port so i would guess that you have a spanning tree loop. What is the status of the interface?
    Infrastructure Architect
    CCNA, CCNA Security, MCSE, JNCIS

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    • #3
      Re: Slow link (with blinking Amber Light) between Cisco Switches

      Try removing the "spanning-tree portfast" from SwitchA port 17.
      And force the speed and duplex of SwitchB port 24 to 100 and full.
      CCNA, Network+

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      • #4
        Re: Slow link (with blinking Amber Light) between Cisco Switches

        Originally posted by BigDeesDad View Post
        A blinking amber LED means there is an error or the port so i would guess that you have a spanning tree loop. What is the status of the interface?
        Here is the complete status of the interface:

        Code:
        FastEthernet0/17 is up, line protocol is up (connected)
          Hardware is Fast Ethernet, address is 001c.b1a5.5c11 (bia 001c.b1a5.5c11)
          MTU 1500 bytes, BW 100000 Kbit, DLY 100 usec,
             reliability 255/255, txload 1/255, rxload 1/255
          Encapsulation ARPA, loopback not set
          Keepalive set (10 sec)
          Full-duplex, 100Mb/s, media type is 100BaseTX
          input flow-control is unsupported output flow-control is unsupported
          ARP type: ARPA, ARP Timeout 04:00:00
          Last input 00:00:00, output 00:00:09, output hang never
          Last clearing of "show interface" counters never
          Input queue: 0/75/0/0 (size/max/drops/flushes); Total output drops: 0
          Queueing strategy: fifo
          Output queue: 0/40 (size/max)
          5 minute input rate 20000 bits/sec, 21 packets/sec
          5 minute output rate 10000 bits/sec, 9 packets/sec
             10966652 packets input, 2341378947 bytes, 0 no buffer
             Received 2580298 broadcasts (0 multicast)
             6546 runts, 1994 giants, 0 throttles
             453075 input errors, 219620 CRC, 224915 frame, 0 overrun, 0 ignored
             0 watchdog, 1375295 multicast, 0 pause input
             0 input packets with dribble condition detected
             6535173 packets output, 874266750 bytes, 0 underruns
             0 output errors, 0 collisions, 2 interface resets
             0 babbles, 0 late collision, 0 deferred
             0 lost carrier, 0 no carrier, 0 PAUSE output
             0 output buffer failures, 0 output buffers swapped out
        Thank you for the help.

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        • #5
          Re: Slow link (with blinking Amber Light) between Cisco Switches

          Originally posted by Daze View Post
          Try removing the "spanning-tree portfast" from SwitchA port 17.
          And force the speed and duplex of SwitchB port 24 to 100 and full.
          I removed the spanning-tree portfast on switch A but I could not adjust the speed and duplex of the port on switch B. I entered in the commands in the configure mode on the interface but when I exited the settings did not show up. Does it matter that this particular interface is fiber and a media converter is used to go to ethernet on switch A? The configuration worked before.

          In either case, I am attaching the latest version of the configuration files.
          Attached Files

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          • #6
            Re: Slow link (with blinking Amber Light) between Cisco Switches

            Try changing the cable.

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            • #7
              Re: Slow link (with blinking Amber Light) between Cisco Switches

              You have a lot of damaged frames that Switch A receives. First think you should try is to change the patch cords between these two devices.

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