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MA5600T mac-address number differ in different views for same boad and vlan caused by network loop

Publication Date:  2012-07-25 Views:  58 Downloads:  0
Issue Description
MA5600T version: MA5600V800R005C32B150.
On customer MSAN MA5600T board mac address view has less mac addresses that is displayed on mac-address vlan view:
Lc-743-56T-HW(config)#display mac-address board 0/4
  --------------------------------------------------------
  TYPE      MAC                 MAC TYPE   F/S     VLAN ID
  --------------------------------------------------------
  adl       0017-318d-8455      dynamic    0/4         624
  adl       0018-0202-29d4      dynamic    0/4         624
  --------------------------------------------------------
Lc-743-56T-HW(config)#display mac-address vlan 624
  113 adl   0002-cfae-7fc5 dynamic  0 /4 /17 1    32   -     -            624
    111 adl   0017-318d-8455 dynamic  0 /4 /15 1    32   -     -            624
    107 adl   0011-95d6-df5d dynamic  0 /4 /11 1    32   -     -            624
    107 adl   0090-1a42-4021 dynamic  0 /4 /11 1    32   -     -            624
    107 adl   0022-b0bf-4861 dynamic  0 /4 /11 1    32   -     -            624
    127 adl   0019-c6cc-f9b5 dynamic  0 /4 /31 1    32   -     -            624
    109 adl   0018-0202-29d4 dynamic  0 /4 /13 1    32   -     -            624
    107 adl   0090-1a42-b1c3 dynamic  0 /4 /11 1    32   -     -            624
    107 adl   0090-1a42-4140 dynamic  0 /4 /11 1    32   -     -            624
    100 adl   0013-774b-c3e4 dynamic  0 /4 /4  1    32   -     -            624
Alarm Information
Null
Handling Process
After checking mac addresses have found that some of them (0090-1a42-4021, 0090-1a42-b1c3, 0090-1a42-4140) belongs to BRAS mac addresses range and should be learned only on uplink port. Hence, on some board's ports network loop exist, has asked customer to remove network loop and the problem disappeared.
Root Cause
1. Check mac addresses that are not consistant.
2. ask customer about those addresses.
Suggestions
Ask customer to configure ACLs that protect from network loop even if such exists.

END