Solved

Deferred Tx and Port Drops

Posted on 2011-09-29
10
3,107 Views
Last Modified: 2012-08-13
Hello i have two procurve switches connected with two Trunks (port channel) TRK1 is port 1 and 2 and TRK2 is port 23 and 24.

On port 1 and 2 i am noticing Deferred Tx: i checked the auto negotiation for all ports and these are all correct.

Port 22 of both Sw1 and Sw2 goes to another L3 switch which is Cisco, port 22 of Sw2 is down because of spanning tree.

Any ideas?  Show commands attached.


Show.txt
0
Comment
Question by:Jack-Black
  • 5
  • 5
10 Comments
 
LVL 3

Expert Comment

by:pistanu
Comment Utility
on cisco ports:

spanning-tree bpdufilter enable

for errors check the flow control, it needs to be on both interfaceson/off not combination with one end on and the other off.

Deferred errors:

The deferred counter counts the number of times the interface has tried to send a frame, but found the carrier busy at the first attempt (Carrier Sense). This does not constitute a problem, and is part of normal Ethernet operation.
0
 

Author Comment

by:Jack-Black
Comment Utility
I am adding the show interface of the CISCO port connecting to SW1, please note the pause input counters.


GigabitEthernet2/0/2 is up, line protocol is up (connected)

  Hardware is Gigabit Ethernet, address is 5835.d9a9.0c02 (bia 5835.d9a9.0c02)

  Description: SW1-Port22

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

     reliability 255/255, txload 76/255, rxload 19/255

  Encapsulation ARPA, loopback not set

  Keepalive set (10 sec)

  Full-duplex, 1000Mb/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 00:00:48, output hang never

  Last clearing of "show interface" counters 1d01h

  Input queue: 0/75/0/0 (size/max/drops/flushes); Total output drops: 44884

  Queueing strategy: fifo

  Output queue: 0/40 (size/max)

  5 minute input rate 74646000 bits/sec, 7536 packets/sec

  5 minute output rate 298541000 bits/sec, 28300 packets/sec

     1863976424 packets input, 2593355954882 bytes, 0 no buffer

     Received 189043 broadcasts (189038 multicasts)

     0 runts, 0 giants, 0 throttles

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

     0 watchdog, 189038 multicast, 33326 pause input

     0 input packets with dribble condition detected

     2083631112 packets output, 1973233746208 bytes, 0 underruns

 

0
 
LVL 3

Expert Comment

by:pistanu
Comment Utility
pause input:

      Description: Cisco IOS show interfaces counter. An increment in pause input counter means that the connected device requests for a traffic pause when its receive buffer is almost full. Common Causes: This counter is incremented for informational purposes, since the switch accepts the frame. The pause packets stop when the connected device is able to receive the traffic.

did you try with flow control off? it's not a problem if you have this errors.so do you have problems with this links?

0
 

Author Comment

by:Jack-Black
Comment Utility
Flowcontrol is on.
0
 
LVL 3

Expert Comment

by:pistanu
Comment Utility
from your post:

input flow-control is on, output flow-control is unsupported
0
What Security Threats Are You Missing?

Enhance your security with threat intelligence from the web. Get trending threat insights on hackers, exploits, and suspicious IP addresses delivered to your inbox with our free Cyber Daily.

 

Author Comment

by:Jack-Black
Comment Utility
Do you think the drops "Total output drops: 44884" and the "output flow-control is unsupported" are related.

The HP switches have flowcontrol enabled on the ports as far as i know it is enabled in and out by default.

What about the 33326 pause input?
0
 
LVL 3

Expert Comment

by:pistanu
Comment Utility
i think so, try to enable on cisco output flow control ON, or put it off for every link cisco-hp
0
 

Author Comment

by:Jack-Black
Comment Utility
can you give me the command to enable flowcontrol on the cisco out please
0
 
LVL 3

Accepted Solution

by:
pistanu earned 500 total points
Comment Utility
on 3560 only receive flowcontrol  can be put on or off.
on 7600 you can put both(receive/send) to on or off.

in you case try to put off on cisco and on HP too.do you have graphs ont that ports?maybe in some peak time you're in congestion.
0
 

Author Comment

by:Jack-Black
Comment Utility
Will try to get some graphs.
0

Featured Post

IT, Stop Being Called Into Every Meeting

Highfive is so simple that setting up every meeting room takes just minutes and every employee will be able to start or join a call from any room with ease. Never be called into a meeting just to get it started again. This is how video conferencing should work!

Join & Write a Comment

Managing 24/7 IT Operations is a hands-on job and indeed a difficult one. Over the years I have found some simple tips and techniques to increase the efficiency of the overall operations. The core concept has always been on continuous improvement; a…
In the world of WAN, QoS is a pretty important topic for most, if not all, networks. Some WAN technologies have QoS mechanisms built in, but others, such as some L2 WAN's, don't have QoS control in the provider cloud.
After creating this article (http://www.experts-exchange.com/articles/23699/Setup-Mikrotik-routers-with-OSPF.html), I decided to make a video (no audio) to show you how to configure the routers and run some trace routes and pings between the 7 sites…
Here's a very brief overview of the methods PRTG Network Monitor (https://www.paessler.com/prtg) offers for monitoring bandwidth, to help you decide which methods you´d like to investigate in more detail.  The methods are covered in more detail in o…

762 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question

Need Help in Real-Time?

Connect with top rated Experts

9 Experts available now in Live!

Get 1:1 Help Now