02-20-2008 10:46 PM
He Experts,
I got two entrys for my LMS 2.6 server in UT on difference switches. Fact is the server is connected to Switch vre-6-neuulm-RZ11-deu Port Fa0/2 and never before on Switch dit-6-neuulm-01-ras-deu.
Is that a arp problem of this switch based on bug of IOS, we have problems with this switch arp entry, or with LMS ?
Danke Gruss Steffen
User Name
Host Name ditdenusrvipm01.eu.net.dana.com
MAC Address 00-13-21-b1-9a-f8
IP Address 10.224.44.12
Subnet 10.224.44.0
Switch dit-6-neuulm-01-ras-deu
Port Fa0/12
Port State static
VLAN inactive91
Port Speed 100M
Port Duplex full-duplex
Last Seen 2008/02/18 20:46:05
-----------------
User Name
Host Name ditdenusrvipm01.eu.net.dana.com
MAC Address 00-13-21-b1-9a-f8
IP Address 10.224.44.12
Subnet 10.224.44.0
Switch vre-6-neuulm-RZ11-deu
Port Fa0/2
Port State static
VLAN DIT1_VLAN
Port Speed 100M
Port Duplex full-duplex
Last Seen 2008/02/20 10:34:10
-----------------
dit-6-neuulm-01-ras-deu#sh mac-address-table
Dynamic Address Count: 12
Secure Address Count: 0
Static Address (User-defined) Count: 0
System Self Address Count: 50
Total MAC addresses: 62
Maximum MAC addresses: 8192
Non-static Address Table:
Destination Address Address Type VLAN Destination Port
------------------- ------------ ---- --------------------
0007.b35c.1430 Dynamic 91 FastEthernet0/4
0016.c8e5.de50 Dynamic 92 FastEthernet0/16
0030.482c.4a34 Dynamic 92 FastEthernet0/15
0030.482c.4a35 Dynamic 93 FastEthernet0/20
0050.5aeb.32fc Dynamic 92 FastEthernet0/14
0050.5aeb.34dc Dynamic 93 FastEthernet0/14
0050.5aeb.34fc Dynamic 91 FastEthernet0/5
00a0.8e35.c141 Dynamic 91 FastEthernet0/1
00a0.8e35.c14d Dynamic 92 FastEthernet0/13
00a0.8e35.c5a1 Dynamic 91 FastEthernet0/5
00a0.8e35.c5ad Dynamic 92 FastEthernet0/14
00a0.8e9e.5491 Dynamic 91 FastEthernet0/7
flash:c3500XL-c3h2s-mz-120.5.2-XU.bin
Solved! Go to Solution.
02-20-2008 11:18 PM
Not sure if those devices learn MAC addresses, but you certainly shouldn't see another duplicate appear on that port with nothing connected to it. Go ahead and delete the dup entry from UT, and it should not come back.
02-20-2008 10:54 PM
Well, the code on this switch is very old, and known to be problematic. However, UT isn't typically going to make stuff up. If it said the MAC appeared on Fa0/12 on 2/18/2008, then it probably did. Something we do see from time to time is with certain network topologies, UT will report end hosts connected to uplink ports on switches. So, if this dit-6-neuulm-01-ras-deu switch's port Fa0/12 is an uplink port which is not trunking, and does not have a CDP neighbor that appears on the Campus Topology Map, then UT will not be able to tell that a MAC address which is learned on this port is not actually connected to this port.
Without seeing the full config on this switch, the show cdp neighbor output, or a debug log from when UT last found this MAC, I cannot be certain this is what you're seeing, but the symptoms fit.
02-20-2008 11:06 PM
02-20-2008 11:08 PM
But what does connect to that port? Any other switch or bridge that may have learned that MAC could cause an entry to be learned in this 3500XL. The fact that this port isn't trunking and doesn't have CDP enabled makes it a prime candidate for what you are seeing.
02-20-2008 11:15 PM
right now nothing is connected, int and protocol are down
couple days ago 3 days it was a bluecoat proxy connected but we have trouble with this box also and connected it now inside of our DMZ
Gruss Steffen
02-20-2008 11:18 PM
Not sure if those devices learn MAC addresses, but you certainly shouldn't see another duplicate appear on that port with nothing connected to it. Go ahead and delete the dup entry from UT, and it should not come back.
02-20-2008 11:32 PM
He Clarke,
I learn that the bluecoat proxys working as a bridge. Yes I will delete the wrong entry in UT and I go forward to upgrade the IOS on that switch.
Cool Danke Gruss Steffen
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