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Access network design for branch, remote, outdoor and campus locations with Aruba access points, and mobility controllers.
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Two ethernet cables to one AP and dropped packets on eth1

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  • 1.  Two ethernet cables to one AP and dropped packets on eth1

    Posted May 20, 2022 12:57 PM
    I have an AP with two cables connected to it

    (WLC01) ^*[mynode] #show ap port status ap-name AP-BLAH
    
    AP "AP-BLAH" Port Status (updated every 60 seconds)
    -------------------------------------------------------
    Port  MAC                Type  Forward Mode  Admin     Oper  Speed     Duplex  802.3az   802.3bz  PoE  STP  Portfast  TX-Packets  TX-Bytes    RX-Packets  RX-Bytes
    ----  ---                ----  ------------  -----     ----  -----     ------  -------   -------  ---  ---  --------  ----------  --------    ----------  --------
    0     70:3a:0e:ce:19:f0  5G    N/A           enabled   up    2.5 Gb/s  full    N/A       Yes      N/A  N/A  N/A       13178772    3698367193  13875644    1228992254
    1     70:3a:0e:ce:19:f1  GE    none          enabled   up    1 Gb/s    full    disabled  N/A      N/A  N/A  N/A       163054      32609408    2771132     230113083
    2     72:3a:0e:ce:19:f1  USB   none          disabled  down  N/A       N/A     N/A       N/A      N/A  N/A  N/A       0           0           0           0
    I've noticed that the secondary port appears to be dropping RX packets.
    (WLC01) ^*[mynode] #show ap debug system-status ap-name AP-BLAH | begin "Ethernet"
    eth0      Link encap:Ethernet  HWaddr 70:3A:0E:CE:19:F0  
    ---------------------------------------------------------
              UP BROADCAST RUNNING SLAVE MULTICAST  MTU:1500  Metric:1
              RX packets:13875847 errors:0 dropped:222 overruns:0 frame:0
              TX packets:13178990 errors:0 dropped:0 overruns:0 carrier:0
              collisions:0 txqueuelen:1000 
              RX bytes:1229014318 (1.1 GiB)  TX bytes:3698440538 (3.4 GiB)
              Memory:fe4e0000-fe4e0fff 
    
              Rx broadcast packet:0         Rx broadcast packet per second:0
              Rx multicast packet:0         Rx multicast packet per second:0
              Tx broadcast packet:0         Tx broadcast packet per second:0
              Tx multicast packet:0         Tx multicast packet per second:0
    
    ifconfig output for eth1
    ------------------------
    eth1      Link encap:Ethernet  HWaddr 70:3A:0E:CE:19:F0  
    ---------------------------------------------------------
              UP BROADCAST RUNNING SLAVE MULTICAST  MTU:1500  Metric:1
              RX packets:2771156 errors:0 dropped:1272178 overruns:0 frame:0
              TX packets:163057 errors:0 dropped:0 overruns:0 carrier:0
              collisions:0 txqueuelen:1000 
              RX bytes:230115692 (219.4 MiB)  TX bytes:32610008 (31.0 MiB)
    Both ethernet ports appears to be in a bond0 interface.  My concern is that this AP may be dropping packets and causing a bad experience for the clients connected to it.  The counters are incrementing on the eth1 port so this is not static.

    Has anyone else seen this happen before?

    I can't find the eth1 MAC in my switched network so I'm having remote hands remove the cable as a test.

    ------------------------------
    patrick walton
    ------------------------------


  • 2.  RE: Two ethernet cables to one AP and dropped packets on eth1

    EMPLOYEE
    Posted May 20, 2022 03:05 PM
    Why do you have the second port connected?

    ------------------------------
    Any opinions expressed here are solely my own and not necessarily that of Hewlett Packard Enterprise or Aruba Networks.

    HPE Design and Deploy Guides: https://community.arubanetworks.com/support/migrated-knowledge-base?attachments=&communitykey=dcc83c62-1a3a-4dd8-94dc-92968ea6fff1&pageindex=0&pagesize=12&search=&sort=most_recent&viewtype=card
    ------------------------------



  • 3.  RE: Two ethernet cables to one AP and dropped packets on eth1

    Posted May 20, 2022 04:10 PM
    I inherited this site so I'm not entirely sure why.  Some other areas of the site only have one cable connected to eth0.  Maybe redundancy was the reason?


  • 4.  RE: Two ethernet cables to one AP and dropped packets on eth1

    EMPLOYEE
    Posted May 20, 2022 07:36 PM
    It could be, but you would have to enable lacp on your switch and the AP would negotiate and bond both interfaces together.  You would need to supply high powered POE to ensure that the second ethernet port would even be up.
    If lacp is not configured, the second enet would act as a standby interface, which would make the "drops" irrelevant, really.

    ------------------------------
    Any opinions expressed here are solely my own and not necessarily that of Hewlett Packard Enterprise or Aruba Networks.

    HPE Design and Deploy Guides: https://community.arubanetworks.com/support/migrated-knowledge-base?attachments=&communitykey=dcc83c62-1a3a-4dd8-94dc-92968ea6fff1&pageindex=0&pagesize=12&search=&sort=most_recent&viewtype=card
    ------------------------------