01-24-2024 08:50 AM
Hello,
I have switch c9200 with MAB and vlan assignment, on the user ports it has IP phones and the PCs are connected to these phone.
01-24-2024 09:06 AM
this feature is support in CDP enhancement
which make IP phone send CDP announce the SW about the down of port PC connect to
I think 9300 is new and support this feature but the ip phone if not support then you need
reauth which make SW ask reauth the PC and PC not reply and SW remove the MAC from table.
NOTE:- check why client OS not send logoff to SW, this also help in this case
01-24-2024 09:33 AM
Hello,
as far as I recall, MAB is often used in conjunction with port security and sticky MAC addresses. Is that an option for you ?
You can set the timeout value to a lower value:
interface GigabitEthernet1/0/1 # Replace with the actual interface of the switch
switchport port-security maximum 2 # Set the maximum number of secure MAC addresses
switchport port-security aging time 2 # Set the MAC address aging time in minutes
switchport port-security violation restrict # Set the violation action (restrict, protect, shutdown)
switchport port-security
switchport port-security mac-address sticky
switchport mode access
01-25-2024 06:59 AM
01-25-2024 07:12 AM
Can yoh check tlv lldp use in other vendor and one use by SW
There is tlv that do same as cdp enhancement.
MHM
01-26-2024 07:20 AM
Hello thank for reply ,
On my dell switch n2200 i have :
show lldp interface gigabitethernet 1/0/1
LLDP Interface Configuration
Interface Link Transmit Receive Notify TLVs
--------- ------ -------- -------- -------- -------------
Gi1/0/1 Up Enabled Enabled Disabled 0,1
TLV Codes: 0- Port Description, 1- System Name, 2- System Description
3- System Capabilities, 4- Port VLAN, 5- Management Address
On my C9200
show lldp interface gigabitEthernet 1/0/1
GigabitEthernet1/0/1:
Tx: enabled
Rx: enabled
Tx state: IDLE
Rx state: WAIT FOR FRAME
I'm not sure I have the right information on my Cisco switch. I don't see any active tlv
01-27-2024 03:47 AM
Can you add these below tlv under ONE port (not in global mode) and check
TLV Codes:
0- Port Description,
1- System Name,
2- System Description
3- System Capabilities,
4- Port VLAN,
5- Management Address
I check lldp but I couldn't find which tlv use to inform SW the PC port is disconnected
Thanks
MHM
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