X460 and X450 Flapping Ports

[Martin_Harrow]

I have installed 15 new X460 switch stacks, and upgraded the Firmware on some old X450s.
I notice that many of the Ethernet Ports are "Flapping". There is no stable connection, and devices constantly disconnect/reconnect at 10M/100M/1000M. I note that the problem is worse with some Canon Printers, but other devices have problems. I can make the ports more stable by forcing the speed to 10M.

Here are some typical syslogs:

May 6 10:21:31 degp-s02 Port 5:2 link down
May 6 10:21:34 degp-s02 Port 5:2 link UP at speed 1 Gbps and full-duplex
May 6 10:22:25 degp-s02 Port 5:2 link down
May 6 10:22:27 degp-s02 Port 5:2 link UP at speed 10 Mbps and half-duplex
May 6 10:22:43 degp-s02 Port 4:24 link down
May 6 10:22:45 degp-s02 Port 4:24 link UP at speed 10 Mbps and half-duplex
May 6 10:22:47 degp-s02 Port 1:10 link down
May 6 10:22:50 degp-s02 Port 1:10 link UP at speed 1 Gbps and full-duplex
May 6 10:22:50 degp-s02 Port 5:2 link down
May 6 10:22:53 degp-s02 Port 5:2 link UP at speed 1 Gbps and full-duplex
May 6 10:23:14 degp-s02 Port 1:10 link down
May 6 10:23:16 degp-s02 Port 1:10 link UP at speed 1 Gbps and full-duplex
May 6 10:25:24 degp-s02 Port 5:2 link down
May 6 10:25:27 degp-s02 Port 5:2 link UP at speed 10 Mbps and half-duplex
May 6 10:25:39 degp-s02 Port 3:42 link down
May 6 10:25:41 degp-s02 Port 3:42 link UP at speed 10 Mbps and half-duplex
May 6 10:25:43 degp-s02 Port 3:42 link down
May 6 10:25:45 degp-s02 Port 3:42 link UP at speed 10 Mbps and half-duplex
May 6 10:26:29 degp-s02 Port 4:24 link down
May 6 10:26:32 degp-s02 Port 4:24 link UP at speed 10 Mbps and half-duplex
May 6 10:27:44 degp-s02 Port 3:38 link down
May 6 10:27:47 degp-s02 Port 3:38 link UP at speed 10 Mbps and half-duplex
May 6 10:27:51 degp-s02 Port 5:2 link down
May 6 10:27:53 degp-s02 Port 5:2 link UP at speed 1 Gbps and full-duplex
May 6 10:28:06 degp-s09 Port 1:16 link down
May 6 10:28:08 degp-s09 Port 1:16 link UP at speed 10 Mbps and half-duplex
May 6 10:30:05 degp-s03 Port 1:1 link down
May 6 10:30:06 degp-s09 Port 1:16 link down
May 6 10:30:08 degp-s03 Port 1:1 link UP at speed 10 Mbps and full-duplex
May 6 10:30:09 degp-s09 Port 1:16 link UP at speed 1 Gbps and full-duplex
May 6 10:30:20 degp-s03 Port 1:1 link down
May 6 10:30:23 degp-s03 Port 1:1 link UP at speed 10 Mbps and full-duplex
May 6 10:30:57 degp-s03 Port 1:19 link down
May 6 10:30:59 degp-s03 Port 1:19 link UP at speed 10 Mbps and full-duplex
May 6 10:31:12 degp-s03 Port 1:19 link down
May 6 10:31:14 degp-s03 Port 1:19 link UP at speed 10 Mbps and full-duplex

How can I fix this? I have new(ish) f/w (X460 = v1541b3-patch1-1 and X450 = v1265b2-patch1-3)

Most of the cabling is brand new, could this be a problem?

Thanks,
Martin

[Martin_Harrow]

Robert, thanks for the feedback. I have tried this, it helps a bit. 😉

[rbrt]

Hi Martin,

I suspect that your old switches were Fast Ethernet switches? In this case you should check your passive infrastructure. I've seen issues with Gigabit in one of our offices as well, turned out that the - very old - cabling wasn't able to handle Gigabit Ethernet. If cabling turns out to be the issue you've basically got two options:

* Replace the cabling.
* configure ports auto on speed 100 duplex full

The first option can be quite budget intense, but is the better solution.

-Robert

[Martin_Harrow]

Hi Edson, Thanks for the input. Most of my problems occur with Canon printers, so as a work around I have been setting the speed to 10M fixed. I'm just annoyed that we have "upgraded" from 10 year old Cisco switches (which had no problems) to brand new Extreme switches that have these problems.

[Edson_Yuji]

I had this same problem in Extreme switches. This happened when I fixed the port speed to 100Mbps Full duplex for example, workstation and IP station and printers were auto-negotiation happened flapping port.

[Sumit_Tokle]

Yes,

You can share the below information to TAC when you open case. It would help to get resolution as soon as possible.

Network topology diagram
show forwarding configuration
debug hal show forwarding distributions
debug hal show ipv4Mc
show iproute reserved-entries statistics
show tech
show port information detail
show port configuration
debug hal show optic-info
debug hal show cpu-queue

Thanks.