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New Member

Multiple entries for same MAC

LMS 2.6 with patches:

In UT Report I have 19 entries for one MAC address, each discovered at the same time. Each entry is connected to different Devices. After checking to see what this device is, it appears to be VLAN interfaces on a 6509 Router connected to different switches. How can this be? These are not end hosts, should they be displaying in the UT report?

5 REPLIES
Cisco Employee

Re: Multiple entries for same MAC

Pick one entry. What switch and port is it connected to? What does the show mac-address-table look like on that switch?

Typically, we see duplicates similar to this when non-Cisco gear or non-CDP gear is involved, and trunking is not being used. However, VLAN MACs are odd. Are you certain this is truly a virtual MAC? What is the MAC address?

New Member

Re: Multiple entries for same MAC

The MAC is 00:06:52:05:f0:00, which is a Cisco device (on 6509), here is some info from the Detailed device report for the 6509, below:

There are several entries with the same MAC, different index numbers starting at 70, thru 101. These are the guys showing up as end hosts on downstream switches. Downstream switches are CISCO, and this MAC shows up on the one of switches connected to VLAN109:

sh mac-address-table entry

109 0006.5205.f000 DYNAMIC Gi0/1

70 00:06:52:05:f0:00 Vl2 Vlan2 propVirtual 95.35011 EnabledOrCommissioned OK 0:2:58 EXCHANGE Mby 1 authentication tothemoo 1500

71 00:06:52:05:f0:00 Vl37 Vlan37 propVirtual 953.5106 EnabledOrCommissioned OK 0:2:58 for A/LM/PMP/CPM(B+P) HSRP STANDBY 1500

72 00:06:52:05:f0:00 Vl38 Vlan38 propVirtual 953.5106 EnabledOrCommissioned OK 0:2:58 CA Vlan# 38 HSRP STANDBY 1500

73 00:06:52:05:f0:00 Vl39 Vlan39 propVirtual 953.5106 EnabledOrCommissioned OK 0:2:58 for DS Vlan#39 HSRP STANDBY 1500

74 00:06:52:05:f0:00 Vl41 Vlan41 propVirtual 953.5106 EnabledOrCommissioned OK 0:2:58 ACC HSRP STANDBY 1500

75 00:06:52:05:f0:00 Vl73 Vlan73 propVirtual 953.5106 EnabledOrCommissioned OK 0:2:59 ESOC_CA_Connection HSRP STANDBY 1500

76 00:06:52:05:f0:00 Vl102 Vlan102 propVirtual 953.5106 DisabledOrDecommissioned StoppedOrSuspended 0:1:41 NEW MGMT Vlan SEGMENT 1500

77 00:06:52:05:f0:00 Vl105 Vlan105 propVirtual 953.5106 EnabledOrCommissioned OK 0:2:59 TWD Operators HSRP STANDBY 1500

78 00:06:52:05:f0:00 Vl106 Vlan106 propVirtual 953.5106 EnabledOrCommissioned OK 0:2:59 Video Conf Segment HSRP STANDBY 1500

79 00:06:52:05:f0:00 Vl109 Vlan109 propVirtual 953.5106 EnabledOrCommissioned OK 0:2:59 for HR HSRP STANDBY 1500

80 00:06:52:05:f0:00 Vl110 Vlan110 propVirtual 953.5106 EnabledOrCommissioned OK 0:2:59 for PRM HSRP STANDBY 1500

81 00:06:52:05:f0:00 Vl111 Vlan111 propVirtual 953.5106 EnabledOrCommissioned OK 0:2:59 MS MED HSRP STANDBY 1500

82 00:06:52:05:f0:00 Vl116 Vlan116 propVirtual 953.5106 EnabledOrCommissioned OK 0:2:59 for IPS HSRP STANDBY 1500

83 00:06:52:05:f0:00 Vl117 Vlan117 propVirtual 953.5106 EnabledOrCommissioned OK 0:2:59 CYLINK MGNT STANDBY 1500

84 00:06:52:05:f0:00 Vl118 Vlan118 propVirtual 953.5106 EnabledOrCommissioned OK 0:2:59 Glue to MS-LAN-R3 G7/2 1500

85 00:06:52:05:f0:00 Vl119 Vlan119 propVirtual 953.5106 DisabledOrDecommissioned StoppedOrSuspended 154 days 5:57:1 for AFSA HSRP STANDBY 1500

86 00:06:52:05:f0:00 Vl122 Vlan122 propVirtual 953.5106 EnabledOrCommissioned OK 0:2:59 LEGAL HSRP STANDBY 1500

87 00:06:52:05:f0:00 Vl123 Vlan123 propVirtual 953.5106 EnabledOrCommissioned OK 0:2:59 EUR HSRP STANDBY 1500

88 00:06:52:05:f0:00 Vl124 Vlan124 propVirtual 953.5106 EnabledOrCommissioned OK 0:2:59 DFA HSRP ACTIVE 1500

89 00:06:52:05:f0:00 Vl125 Vlan125 propVirtual 953.5106 EnabledOrCommissioned OK 0:2:59 EAP HSRP ACTIVE 1500

90 00:06:52:05:f0:00 Vl126 Vlan126 propVirtual 953.5106 EnabledOrCommissioned OK 0:2:59 EB HSRP ACTIVE 1500

91 00:06:52:05:f0:00 Vl128 Vlan128 propVirtual 953.5106 EnabledOrCommissioned OK 0:2:59 AF,VC/VO HSRP ACTIVE 1500

92 00:06:52:05:f0:00 Vl130 Vlan130 propVirtual 953.5106 EnabledOrCommissioned OK 0:2:59 EXHIBIT HALL HSRP ACTIVE 1500

93 00:06:52:05:f0:00 Vl131 Vlan131 propVirtual 953.5106 EnabledOrCommissioned OK 0:2:59 S/CPR (Office of Protocol) HSRP ACTIVE 1500

94 00:06:52:05:f0:00 Vl132 Vlan132 propVirtual 953.5106 EnabledOrCommissioned OK 0:2:59 OIG HSRP ACTIVE 1500

95 00:06:52:05:f0:00 Vl133 Vlan133 propVirtual 953.5106 EnabledOrCommissioned OK 0:2:59 FMP ACTIVE 1500

96 00:06:52:05:f0:00 Vl136 Vlan136 propVirtual 953.5106 EnabledOrCommissioned OK 0:2:59 CA ACTIVE 1500

97 00:06:52:05:f0:00 Vl141 Vlan141 propVirtual 953.5106 EnabledOrCommissioned OK 0:2:59 DS (TELEWALL) HSRP ACTIVE 1500

98 00:06:52:05:f0:00 Vl142 Vlan142 propVirtual 953.5106 EnabledOrCommissioned OK 0:2:59 GPSP HSRP ACTIVE 1500

Cisco Employee

Re: Multiple entries for same MAC

The fact that the MAC is showing up on port Gi0/1. Is this port trunking? Does this port show up as a link endpoint on the topology map?

New Member

Re: Multiple entries for same MAC

Yes these ports show trunking and yes as a link endpoint in topology map. Is this correct?

Cisco Employee

Re: Multiple entries for same MAC

I suggest you open a TAC service request, then, as debugging will need to be done to figure out why this port is showing in UT.

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