[c-nsp] ME3600 FCS packet generation issue

Fri Oct 24 06:39:01 EDT 2014

Hello Ramji,

Between June and now we observed the issue three times. The last Tuesday we observed the issue again. I think that the issue could happen. I attach the show running config. Yesterday we changed the connection between my two ME3600, now they are connected via Te0/1 interface (with a 1G SFP).

I don't understand exactly what you mean regarding the traffic profile. I monitor the bandwidth utilization with SNMP and make graphs. In the ports connected to my routers it seems more smooth than the ports with customer devices. The ports with low bandwidth seem more bursty and the ports with high bandwidth seem more smooth.

Best Regards,
Jordi

From: ramji at cisco.com
To: jordimagrane at hotmail.com; waris at cisco.com; cisco-nsp at puck.nether.net
Subject: RE: [c-nsp] ME3600 FCS packet generation issue
Date: Fri, 24 Oct 2014 10:08:13 +0000

Hi Jordi,

Would it be possible for you to share the running configuration and also the traffic profile through the box? Ideal would be to for us to look into the box
 when the input errors are happening. Do you think that’s possible should it happen next time?

Thanks,
Ramji

From: Jordi Magrané Roig [mailto:jordimagrane at hotmail.com]

Sent: Friday, October 24, 2014 3:34 PM

To: Ramji Vasudevan (ramji); Waris Sagheer (waris); cisco-nsp at puck.nether.net

Subject: RE: [c-nsp] ME3600 FCS packet generation issue

Hello,

Waris, in this moment I cannot capture packets because the device is running ok. So, now the packets are correctly forwarded. We changed the SFPs and checked the SDH network and all is ok. The ME3600 has customer devices connected that we also manage and in
 these customer devices we see the "input errors" in the "show interface" command.

Ramji, during the issue, I see the input error counter and CRC. This is the output of one of the customer devices connected to the ME3600. I see the same in my routers and the customer devices that I manage:

GEC#sh interfaces gigabitEthernet 0/24

GigabitEthernet0/24 is up, line protocol is up (connected)

  Hardware is Gigabit Ethernet, address is f029.299a.c018 (bia f029.299a.c018)

  MTU 1500 bytes, BW 1000000 Kbit/sec, DLY 10 usec, 

     reliability 255/255, txload 3/255, rxload 15/255

  Encapsulation ARPA, loopback not set

  Keepalive not set

  Full-duplex, 1000Mb/s, media type is LX

  input flow-control is off, 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 10w1d

  Input queue: 0/75/0/0 (size/max/drops/flushes); Total output drops: 0

  Queueing strategy: fifo

  Output queue: 0/40 (size/max)

  5 minute input rate 61712000 bits/sec, 12116 packets/sec

  5 minute output rate 14649000 bits/sec, 11323 packets/sec

     57831794972 packets input, 37874524124404 bytes, 0 no buffer

     Received 2014804 broadcasts (36949 multicasts)

     0 runts, 0 giants, 0 throttles 

     106923 input errors, 106923 CRC, 0 frame, 0 overrun, 0 ignored

     0 watchdog, 36949 multicast, 0 pause input

     0 input packets with dribble condition detected

     51903725030 packets output, 8974825457660 bytes, 0 underruns

     0 output errors, 0 collisions, 0 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

Best Regards,

Jordi.

From:
ramji at cisco.com

To: waris at cisco.com; 
jordimagrane at hotmail.com; cisco-nsp at puck.nether.net

Subject: RE: [c-nsp] ME3600 FCS packet generation issue

Date: Fri, 24 Oct 2014 09:42:06 +0000

Hi Jordi,

When you say that the packet is getting dropped by the peer router, are you seeing CRC errors on it?

Thanks,
Ramji

From: Waris Sagheer (waris)

Sent: Friday, October 24, 2014 3:11 PM

To: Jordi Magrané Roig; cisco-nsp at puck.nether.net

Cc: Ramji Vasudevan (ramji)

Subject: Re: [c-nsp] ME3600 FCS packet generation issue

Jordi,

Can you please capture the packet? Are there any layer 1 issue in the network? 

Ramji,

Have you come across any such issue on ME3600X?

Best Regards,

Waris Sagheer

Technical Marketing Manager

Service Provider Access Group (SPAG)

waris at cisco.com

Phone: +1 408 853 6682

Mobile: +1 408 835 1389

CCIE - 19901

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From:
Jordi Magrané Roig <jordimagrane at hotmail.com>

Date: Friday, October 24, 2014 at 1:12 AM

To: "cisco-nsp at puck.nether.net" <cisco-nsp at puck.nether.net>

Subject: [c-nsp] ME3600 FCS packet generation issue

Hello,

My name is Jordi. I have a strange issue with one of my

ME3600. I have a ME3600 connected to a C7609 via the G0/24 port and

connected to another ME3600 connected via G0/22 port. In the middle of

the connection between the two ME3600 there is a SDH network (Ethernet

over SDH). I have a recurring issue in the ME3600, for some reason when

the device receive a packet and forwards the packet, the device sends

the packet with FCS errors, so the other end detects the "input error"

and drops the packet. I don't know if the device sends the data

corrupted or makes wrong the calculation of the FCS. The device can work

correctly during two months and some day the device starts with this

problem. Reloading the device fixes the issue during a time. I saw the

issue for the first time at June. I changed the device, but the issue

appeared again and I upgraded the IOS from 15.3(3)S to 15.4(2)S1 but

still the same. I think that this issue could be a bug but I don't know

which event triggers the issue. Someone could help me?

Thank you very much and sorry for my English.

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