×

Warning message

  • Cisco Support Forums is in Read Only mode while the site is being migrated.
  • Cisco Support Forums is in Read Only mode while the site is being migrated.

Packet drop in E1 Link

Unanswered Question
May 22nd, 2012
User Badges:

I having a basic query in troubleshooting E1 link , here im facing packet drop in the link and we are testing by providing local loop and remote loop from the CSU/DSU at local point and at  remote point . I have tried  ping test while the loop is given at local point and remote point ie i have pinged my local serial interface IP address (eg 10.0.0.1 -local  & 10.0.0.2 -remote ) in Remote Loop  i could see no errors and drops and also the traffic on the interface output and input is the same(eg input rate 1000bps and output rate  1000bps) .My query is that when i am pinging the local interface IP does the icmp packet  travels till the loop point  and comes to the same interface(like a boomerang) .Also is this a proper way of testing the link .Kindly provide best practices in checking the issue .



ICMP packet

    ->->->->->->->->->->->->->->->               

R1         Local CSU/DSU             |  Remote CSU/DSU (remote loop given )


O-----------O------------------------------O |--------------------------------------O R2

    <-<-<-<-<-<-<-<-<-<-<-<-<-<-<-|

  • 1
  • 2
  • 3
  • 4
  • 5
Overall Rating: 0 (0 ratings)
Loading.
raja d Wed, 05/23/2012 - 03:52
User Badges:

Hi Friends expecting your advise on this issue

raja d Wed, 05/23/2012 - 12:53
User Badges:

Hi People Please give your feedback

vmiller Wed, 05/23/2012 - 13:14
User Badges:
  • Gold, 750 points or more

1. Walk your loop tests one at a time. for example moving from right to left in the diagram.

loop up the local  csu/dsu. run a test. drop the loop.

loop up the remote end. and repeat.


Is your telco involved in this testing ?



When you say you are dropping packets, what is the evidence ?


Has this link had problems in the past ?

raja d Wed, 05/23/2012 - 23:32
User Badges:

Hi


The link is having packet drop when i ping router A to Router B  and it also had in past which was due to Telco end issue  , my telco is involved and he did a bert test from router A to  till the remote end  (Router B )Mux and there was no error in his test so further we are checking the remote end MUx to router part  . Also my question here is, when im pinging the self ip address of the router A which is recieving a loop from Remote end CSU /DSU does my packets are going like a boomerang and coming to me because im finding input rate and outrate as the same (also explained above in the diagram ) .

paolo bevilacqua Thu, 05/24/2012 - 10:19
User Badges:
  • Super Gold, 25000 points or more
  • Hall of Fame,

    Founding Member

Post

show controllers E1

show itnerface


for both routers.

Actions

This Discussion

Related Content