Mailing List Archive: Lots of "Rx Error" when running "show iparp"

Lots of "Rx Error" when running "show iparp"

Sep 23, 2010, 2:15 PM

Post #1 of 3 (4939 views)

Hi,

I have an X450 switch with lots of servers connected to it. Some servers have shown strange behaviour when it comes to the ethernet link towards the switch.

When I run the: "show iparp" I noticed there is a lot of "RX Error" and the counter just keeps getting higher and higher.

Can anyone explain what this counter means?

Is it possible to see which port is causing the counter to rise?

What is usually the cause for this kind of problem?

SW-1 # sh iparp
VR Destination Mac Age Static VLAN VID Port
VR-Default 192.168.0.1 00:16:3e:0b:00:01 2 NO opc-123 11 1
VR-Default 192.168.63.2 00:16:3e:0b:01:02 7 NO apc-3e 600 13

Dynamic Entries : 21 Static Entries : 0
Pending Entries : 0
In Request : 6866 In Response : 764
Out Request : 754 Out Response : 1
Failed Requests : 0
Proxy Answered : 0
Rx Error : 25576 Dup IP Addr : 0.0.0.0
Rejected Count : 44 Rejected IP : 100.123.77.32
Rejected Port : 1 Rejected I/F : bkp

Max ARP entries : 4096 Max ARP pending entries : 256
ARP address check: Enabled ARP refresh : Enabled
Timeout : 20 minutes
SW-1 #

Best Regards

//// Fredrik

Re: Lots of "Rx Error" when running "show iparp" [ In reply to ]

hj1980 at gmail

Sep 23, 2010, 2:44 PM

Post #2 of 3 (4863 views)

Permalink

> I have an X450 switch with lots of servers connected to it. Some servers
> have shown strange behaviour when it comes to the ethernet link towards the
> switch.

What kind of behaviour have you noticed?

> When I run the: "show iparp" I noticed there is a lot of "RX Error" and the
> counter just keeps getting higher and higher.
> Can anyone explain what this counter means?

From EXOS Command Reference:
"The number of incorrect ARP request and reply packets received. The
malformed packets include the following errors: incorrect ARP op code,
hardware address type is not Ethernet, the protocol address is not IP, and
similar errors."

> Is it possible to see which port is causing the counter to rise?
> What is usually the cause for this kind of problem?

I would have a look at ALL your interfaces and make sure you are not
seeing errors incrementing.
My guess is you will see bad CRC errors, in which case you should look
at cabling and connections.
Are you seeing flaps?
_______________________________________________
extreme-nsp mailing list
extreme-nsp@puck.nether.net
https://puck.nether.net/mailman/listinfo/extreme-nsp

Re: Lots of "Rx Error" when running "show iparp" [ In reply to ]

hj1980 at gmail

Sep 23, 2010, 3:04 PM

Post #3 of 3 (4855 views)

Permalink

> I have Linux servers with network interfaces that suddenly stops working.
> The port will still be active in the Extreme switch but not in the server.
> Looking at the interfaces in the server it reports NO-CARRIER... (?)

Have you got both ends set to autonegotiate speed & duplex?
The recommendation from a lot of 'enterprisey' engineers is to always
have auto on. (never force).

> When running commands like "show port rxerrors/txerrors/collisions" no
> errors are reported at all.

Its interesting that the extreme switch is not seeing L2 errors.
CRC errors might be included in rxerrors on that platform.

How many servers are having this issue?

_______________________________________________
extreme-nsp mailing list
extreme-nsp@puck.nether.net
https://puck.nether.net/mailman/listinfo/extreme-nsp