Catalyst 9500-16X-E intermittent connection VLAN interface of its own

[crister]

Hi Community,

I came across this weird issue where my Catalyst 9500-16X is having intermittent connection to an interface VLAN of its own. The setup is VRRP with a Catalyst 4500-16X switch. The switch was working normal before and I am not sure when this issue started. The issue is same for all of the interface VLANs.

Vlan15 192.168.15.21 YES manual up up

CORE_SW1#ping 192.168.15.21
Type escape sequence to abort.
Sending 5, 100-byte ICMP Echos to 192.168.15.21, timeout is 2 seconds:
!!.!.
Success rate is 60 percent (3/5), round-trip min/avg/max = 1/1/1 ms
CORE_SW1#ping 192.168.15.22
Type escape sequence to abort.
Sending 5, 100-byte ICMP Echos to 192.168.15.22, timeout is 2 seconds:
...
Success rate is 0 percent (0/3)
CORE_SW1#ping 192.168.16.21
Type escape sequence to abort.
Sending 5, 100-byte ICMP Echos to 192.168.16.21, timeout is 2 seconds:
!..!.
Success rate is 40 percent (2/5), round-trip min/avg/max = 1/1/1 ms
CORE_SW1#

[marce1000]

                 - Look at the (error) counters of the involved physical interfaces.

 M.

[paul driver]

Hello
do you get the same results sourcng from a different vlan?
ping 192.168.15.22 source vlan 15

sh vrrp brief
sh vrrp interface vlan 16

[crister]

For some reason, the issue disappeared without any changes. This looks really weird. Anyways, thank you for all of your efforts.

[MHM Cisco World]

first ping with at least repeat  100, 
check the pattern, if the drop is fix pattern then this is CoPP that protect your SW from DDoS, 
it normal. 

[crister]

Hi @MHM Cisco World,

Thank you for your inputs. Is CoPP enabled by default with policies?

[crister]

The issue is here again, and this is what the 100 ping looks like.

CORE_SW1#ping 192.168.50.21 re 100
Type escape sequence to abort.
Sending 100, 100-byte ICMP Echos to 192.168.50.21, timeout is 2 seconds:
.......!!.............!.!.!........!............!.!.!.!...!.!.!.......
.....!.!.!...!.!............!!
Success rate is 20 percent (20/100), round-trip min/avg/max = 1/1/1 ms

[MHM Cisco World]

show processes cpu sort | ex 0.00

can check the CPU ? 

[balaji.bandi]

is this Cat 9500  part of SVL ? what IOS XE code running ?  how is your connection setup with old Cat 4500 switch ?

Looks like you intermittent issue, what is show logging show on both the switches ?

how is your STP running ?