12-03-2021 03:42 AM
Hello
I'm facing to a very strange behavior in the small business switches.
For a reason that I ignore the small business learn mac address in a wrong way.
I have 2 Pc that are connected to 2 differents switches
1 PC is connected to a small business SG500
1 PC is connected to a catalyst C3850
the small business and the catalyst are connected to each other via 1 uplink (in trunk)
When I disconnect the PC from the Catalyst, for a reason that I ignore the mac address of this PC is learned by the small business in an interface that is UP.
In the SG500 when I'm typing "show mac address--table interface giX/X/X, it lists the 2 mac adresses.
here is the version of the small business
Unit SW version Boot version HW version
------------------- ------------------- ------------------- -------------------
1 1.4.11.4 1.4.0.02 V03
I don't know if it'a a known issue or not.
Can someone helps me to figure it out please?
thank you very much for your help
best regards
John
12-03-2021 04:06 AM
Can you provide show output, "show mac address--table interface giX/X/X, it lists the 2 mac adresses.
12-03-2021 05:12 AM
Thank you for your response Balaji,
yes of course, here is the output
LAFR1-RDC02-SG500...#sh mac address-table interface gi3/1/12
Flags: I - Internal usage VLAN
Aging time is 300 sec
Vlan Mac Address Port Type
------------ --------------------- ---------- ----------
3 00:0a:f7:bb:7b:4b gi3/1/12 dynamic
3 34:e6:d7:85:02:3b gi3/1/12 dynamic
LAFR1-RDC02-SG500...#sh run int gi3/1/12
interface gigabitethernet3/1/12
switchport mode access
switchport access vlan 3
and there is only one machine that is connected to the switch.
last our the mac address was seen in the port gi2/1/44, since this port is down the mac address moves to the port gi3/1/12
and the machine is connected to a catalyst.
I don't understand what's going on with the SG switches.
12-03-2021 05:24 AM
00:0a:f7:bb:7b:4b - this broadcom vendor lookup
34:e6:d7:85:02:3b - this dell PC (may be)
show ip arp - what you see association with IP address ?
12-03-2021 08:13 AM
here it is
the ip arp is in the Core network, the mac address is kept for 216 min
of course the PC doesn't respond to the ping (no firewall activated on the PC)
C9300-CR01#sh ip arp 34e6.d785.023b
Protocol Address Age (min) Hardware Addr Type Interface
Internet 172.16.3.88 216 34e6.d785.023b ARPA Vlan3
C9300-CR01#show mac address-table aging-time
Global Aging Time: 300
Vlan Aging Time
---- ----------
12-03-2021 05:15 PM
what is the output
show ip arp | in 00:0a:f7:bb:7b:4b
12-06-2021 06:44 AM
Hello Balaji;
There is no binding with this mac address.
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