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New Member

Packet loss occurs only with over 200 rep only

Hi Community,

I have a question, I have been experienced packets lost in LAN, my question is when I ping the dest with 100 repetitions for example I dont get any packet lost but if I ping the destination with 500 repetitions always I get some packets lost (1 or 2).

Note: I can ping the host with 100 rep several times but I never got any packet lost.

Core# ping 10.32.103.194 count 100

........

--- 10.32.103.194 ping statistics ---

100 packets transmitted, 100 packets received, 0.00% packet loss

round-trip min/avg/max = 0.505/1.266/10.758 ms

Core# ping 10.32.103.194 count 500

..........

--- 10.32.103.194 ping statistics ---

500 packets transmitted, 499 packets received, 0.20% packet loss

round-trip min/avg/max = 0.551/1.283/14.304 ms

This make sense for you?

Have you ever had this kind of issue?

--- Sorry for my english.

Everyone's tags (4)
1 ACCEPTED SOLUTION

Accepted Solutions
Bronze

Packet loss occurs only with over 200 rep only

Hi Omar,

Because ping packets are of low priority and CPU can drop it for any reason that it can't serve a ping request.

Apart from ping packet loss what issue you have? If you have packet loss while your hosts are trying to talk to each other then it is a concern that needs to be looked at. Depending on the platform there are rate-limiters that can drop such packets. So I would see this as normal unless you have any other issues due to this.

Thanks,

Madhu

13 REPLIES
Bronze

Packet loss occurs only with over 200 rep only

Hi Omar,

Because ping packets are of low priority and CPU can drop it for any reason that it can't serve a ping request.

Apart from ping packet loss what issue you have? If you have packet loss while your hosts are trying to talk to each other then it is a concern that needs to be looked at. Depending on the platform there are rate-limiters that can drop such packets. So I would see this as normal unless you have any other issues due to this.

Thanks,

Madhu

New Member

Re: Packet loss occurs only with over 200 rep only

Hi Community,
I have this problem too, the only difference was, i do have a box w a virtual port configured inside facing to a cisco switch using one common port.
eg... Box IP PORT Assignment:
IP Port1: 172.29.250.230, IP Port2: 172.29.250.231
ping to IP 1 w 500 repetitions 0% packet loss
ping to IP 2 w 500 repetitions 20% packet loss

Appreciate your help and suggestions.

Thanks.
Gilbert
Super Bronze

Re: Packet loss occurs only with over 200 rep only

One or two loses out of 500 might be real drops - as a 500 ping runs longer, i.e. allows more time for something "bad" to happen.

Or, as Madhu noted, ping reply is often considered non-critical and receiving host just didn't reply to a couple of ping requests.
New Member

Re: Packet loss occurs only with over 200 rep only

Hi Joseph Doherty,

What is the difference of ping via PC and inside the cisco switch. Ping
inside cisco switch was not clean not like ping in a PC i have no timeout
monitored.

Thanks.
Super Bronze

Re: Packet loss occurs only with over 200 rep only

One difference, if I remember correctly, Cisco devices use ICMP pings while (Windows) PCs use UDP pings.

New Member

Re: Packet loss occurs only with over 200 rep only

Hi Joseph,

Can you please help me how to troubleshoot the attached image set up:

Appreciate very much your help.

Thanks.
Super Bronze

Re: Packet loss occurs only with over 200 rep only

Sorry, what "attached image set up"?
New Member

Re: Packet loss occurs only with over 200 rep only

Hi Joseph,

What i mean the attached file was the network diagram. Kindly help me
troubleshoot why the ping to both IPs are not getting the same response.

Thanks.
Super Bronze

Re: Packet loss occurs only with over 200 rep only

Sorry, I may be somewhat blind, but I don't see any attachments.
New Member

Re: Packet loss occurs only with over 200 rep only

Hi Joseph,

Here in attached the network diagram...

Thanks.

Gilbert
Super Bronze

Re: Packet loss occurs only with over 200 rep only

Sorry, still don't see an attachment.
New Member

Re: Packet loss occurs only with over 200 rep only

Hi Joseph,

Here's the network diagram;


Thanks and regards.

Gilbert Pascua​
Super Bronze

Re: Packet loss occurs only with over 200 rep only

Hmm, I don't know what's the problem, but I'm still not seeing any attachment.
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