12-27-2011 12:03 AM - edited 03-07-2019 04:03 AM
Hi,
I plugged an IP device into a 2960 Catalyst switch. The port is up, but there is no MAC address learned on it:
TNSWAGCS01002(config-if)#do sh mac add int fa0/16
Mac Address Table
-------------------------------------------
Vlan Mac Address Type Ports
---- ----------- -------- -----
TNSWAGCS01002(config-if)#
TNSWAGCS01002(config-if)#do sh int fa0/16
FastEthernet0/16 is up, line protocol is up (connected)
Hardware is Fast Ethernet, address is 0064.40ee.f510 (bia 0064.40ee.f510)
Description: --- STC ---
MTU 1500 bytes, BW 10000 Kbit, DLY 1000 usec,
reliability 255/255, txload 1/255, rxload 1/255
Encapsulation ARPA, loopback not set
Keepalive set (10 sec)
Half-duplex, 10Mb/s, media type is 10/100BaseTX
input flow-control is off, output flow-control is unsupported
ARP type: ARPA, ARP Timeout 04:00:00
Last input never, output 00:00:01, output hang never
Last clearing of "show interface" counters never
Input queue: 0/75/0/0 (size/max/drops/flushes); Total output drops: 0
Queueing strategy: fifo
Output queue: 0/0 (size/max)
5 minute input rate 0 bits/sec, 0 packets/sec
5 minute output rate 0 bits/sec, 0 packets/sec
14432 packets input, 923648 bytes, 0 no buffer
Received 1392 broadcasts (0 multicasts)
0 runts, 0 giants, 0 throttles
0 input errors, 0 CRC, 0 frame, 0 overrun, 0 ignored
0 watchdog, 0 multicast, 0 pause input
0 input packets with dribble condition detected
48956 packets output, 3586289 bytes, 0 underruns
0 output errors, 0 collisions, 18 interface resets
0 babbles, 0 late collision, 0 deferred
0 lost carrier, 0 no carrier, 0 PAUSE output
0 output buffer failures, 0 output buffers swapped out
TNSWAGCS01002(config-if)#
TNSWAGCS01002(config-if)#
interface FastEthernet0/16
description --- STC ---
switchport access vlan 1400
switchport mode access
switchport port-security
switchport port-security violation restrict
switchport port-security mac-address sticky
priority-queue out
mls qos trust cos
spanning-tree portfast
spanning-tree bpduguard enable
end
I read that it may be a L1/L2 issue. We tried with another ethernet cable. We also tried with another IP device of the same model. That did not solve the issue.
Any idea would be appreciated.
Wass
12-27-2011 01:53 AM
Hi,
what is happening if you ping any IP from this device ?
Regards.
Alain
12-27-2011 05:43 AM
Hi Alain,
There are no issues with this switch. One of the symptoms of the issue is that a ping from the gateway to the host fails. The ARP "incomplete" entry appears on the connected router:
Internet 10.101.13.62 - 1cdf.0f1a.4258 ARPA GigabitEthernet0/0.1300
Internet 10.101.13.65 0 Incomplete ARPA
Internet 10.101.13.70 - 1cdf.0f1a.4258 ARPA GigabitEthernet0/0.1400
I did ARP debugs:
- debug arp
- debug arp table
- debug arp interface
- debug arp database
The debug output is in the file attached. Please note that:
- the IP address of the device generating the "incomplete ARP" is 10.101.13.65
- the IP address of the gateway is 10.101.13.70 (subinterface on the branch router)
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