we only changed the switches at access level, so the 2 cores (6509) remained the same as before.
In the 2 cores the arp for that mac address is there.
I also noticed that even some PCs had a similar problem.
That is, during common usage, the yellow triangle appeared on the network connection, preventing me from browsing, pinging the default gateway, etc., etc.
The only way to get it started was to unplug the network cable.
Cisco IOS Software [Everest], Catalyst L3 Switch Software (CAT3K_CAA-UNIVERSALK9-M), Version 16.6.5, RELEASE SOFTWARE (fc1).
@Daniele Galtelli wrote:
we only changed the switches at access level,
Do you have all your access ports have stp portfast enabled?
All access ports have stp porfast and bpduguard enable,
while for ports in trunk spanning tree link type point-to-point
My printer port configurations are as follows:
switchport access vlan 168
switchport mode access
switchport voice vlan 192
switchport port-security maximum 3
switchport port-security violation restrict
switchport port-security aging time 2
spanning-tree bpduguard enable
VLAN0168 is executing the ieee compatible Spanning Tree protocol
Number of topology changes 14 last change occurred 2w4d ago
It also happens on the other switches and in a completely random way.
I also tried to set the speed and mode of the duplex, but I didn't get any benefit.
I also attach the port's show interface
GigabitEthernet1/0/19 is up, line protocol is up (connected)
Hardware is Gigabit Ethernet, address is d4e8.8021.c813 (bia d4e8.8021.c813)
Description: "PC e SoftPhone"
MTU 1500 bytes, BW 100000 Kbit/sec, DLY 100 usec,
reliability 255/255, txload 1/255, rxload 1/255
Encapsulation ARPA, loopback not set
Keepalive set (10 sec)
Full-duplex, 100Mb/s, media type is 10/100/1000BaseTX
input flow-control is on, output flow-control is unsupported
ARP type: ARPA, ARP Timeout 04:00:00
Last input never, output 00:00:00, output hang never
Last clearing of "show interface" counters never
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 58000 bits/sec, 53 packets/sec
165505 packets input, 21076953 bytes, 0 no buffer
Received 20646 broadcasts (431 multicasts)
0 runts, 0 giants, 0 throttles
0 input errors, 0 CRC, 0 frame, 0 overrun, 0 ignored
0 watchdog, 431 multicast, 0 pause input
0 input packets with dribble condition detected
46236676 packets output, 6722600183 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 pause output
0 output buffer failures, 0 output buffers swapped out
I noticed you have port sec applied, Are you getting a port security violations?
Have you tried increasing the aging timeout value?
I'll make this attempt, but it's the exact same value in my old switches.
Should I still have logs if a violation happens? I don't have any logs of this kind
Giallo_5#show port-security interface gi1/0/19
Port Security : Enabled
Port Status : Secure-up
Violation Mode : Restrict
Aging Time : 2 mins
Aging Type : Absolute
SecureStatic Address Aging : Disabled
Maximum MAC Addresses : 3
Total MAC Addresses : 1
Configured MAC Addresses : 0
Sticky MAC Addresses : 0
Last Source Address:Vlan : 8425.1932.8c9f:168
Security Violation Count : 0