Showing results for 
Search instead for 
Did you mean: 

Switch ports does not show mac address

HI. Please help me. There was a problem with WS-C4510R-E. After updating to firmware cat4500e-entservicesk9-mz.152-2.E2.bin does not study the client MAC address (connected directly to the port), the port rises normally full in 1000, there are no errors, the MAC table is full. 

When you type the command:

sh mac address-table int gi
Multicast Entries
vlan mac address type ports

MAC does not see

When configuring port security MAC remembers

sh mac address-table int gi8/7
Unicast Entries
vlan mac address type protocols port
9 xxxxxxxxxxxx static ip,ipx,assigned,other GigabitEthernet

Why is this happening? Port access




Is this switch in production ?

Did you try clearing the mac add table ?




Yes this a switch in

Yes this a switch in production  and I cleared the table MAC

Hall of Fame Community Legend

Post the complete output to

Post the complete output to the command "sh interface Gi 8/7".


sh int gi8/7 GigabitEthernet8

sh int gi8/7
GigabitEthernet8/7 is down, line protocol is down (notconnect)
Hardware is Gigabit Ethernet Port, address is 0023.eb9e.3a76 (bia 0023.eb9e.3a76)
MTU 1500 bytes, BW 1000000 Kbit/sec, DLY 10 usec,
reliability 255/255, txload 1/255, rxload 1/255
Encapsulation ARPA, loopback not set
Keepalive set (10 sec)
Auto-duplex, Auto-speed, link type is auto, media type is 10/100/1000-TX
input flow-control is off, output flow-control is off
ARP type: ARPA, ARP Timeout 04:00:00
Last input 03:10:26, output never, output hang never
Last clearing of "show interface" counters 20:35:46
Input queue: 0/2000/0/0 (size/max/drops/flushes); Total output drops: 0
Queueing strategy: fifo
Output queue: 0/40 (size/max)
30 second input rate 0 bits/sec, 0 packets/sec
30 second output rate 0 bits/sec, 0 packets/sec
59211 packets input, 5828825 bytes, 0 no buffer
Received 59212 broadcasts (31982 multicasts)
0 runts, 0 giants, 0 throttles
0 input errors, 0 CRC, 0 frame, 0 overrun, 0 ignored
0 input packets with dribble condition detected
199195 packets output, 25531819 bytes, 0 underruns
0 output errors, 0 collisions, 3 interface resets
0 unknown protocol drops
0 babbles, 0 late collision, 0 deferred
0 lost carrier, 0 no carrier
0 output buffer failures, 0 output buffers swapped out

At the moment down

Hall of Fame Community Legend

GigabitEthernet8/7 is down,

GigabitEthernet8/7 is down, line protocol is down (notconnect)

Makes sense.  Layer 1 is down, so MAC address is not kept.


He excluded port-sec,

He excluded port-sec, dropping port settings to default and then setting it:

interface GigabitEthernet8/7
switchport access vlan *
switchport mode access
switchport voice vlan *
load-interval 30
spanning-tree portfast
spanning-tree bpduguard enable

it worked - the MAC address for the port being studied.

This IOS bug cat4500e-entservicesk9-mz.152-2.E2.bin

CreatePlease to create content
Content for Community-Ad
July's Community Spotlight Awards