pattern packet loss

[vijay.diwan]

When i ping to its on LAN interface ip address i am getting this pattern packet loss.

Need to know what could be the reasons and where can i get the documents for further information

There is not any policy applied on the interface.

r-08-in#ping 10.204.211.77 re 100 si 1000

Type escape sequence to abort.

Sending 100, 1000-byte ICMP Echos to 10.204.211.77, timeout is 2 seconds:

!!!!!.!!!!!.!!!!!.!!!!!.!!!!!.!!!!!.!!!!!.!!!!!.!!!!!.!!!!!.!!!!!.!!!!

!.!!!!!.!!!!!.!!!!!.!!!!!.!!!!

Success rate is 84 percent (84/100), round-trip min/avg/max = 1/1/4 ms

[Parvesh Paliwal]

Vijay !!

Can you please paste the interface stats, logs and let us know if this is the only interface that is facing the problem ?

Does it drop packets with size 1000 or it does not matter ?

-

Parvesh

[vijay.diwan]

Hi Parvesh,

It drops to all interfaces.

If we increse the packet size then it drops more frequently with the same pattern i.e when packets reaches near to 6000 bytes it is getting dropped.

There is not any policy or rate limiters configured.

I am not understanding what else I should look apart from policy/shaping as no policer applied.

r-08-in#ping 10.204.211.77 re 100 si 1500

Type escape sequence to abort.

Sending 100, 1500-byte ICMP Echos to 10.204.211.77, timeout is 2 seconds:

!!!.!!!.!!!.!!!!.!!!.!!!.!!!.!!!.!!!.!!!.!!!.!!!.!!!.!!!.!!!.!!!.!!!.!

!!.!!!!!.!!!!!.!!!!!.!!!!!.!!!

Success rate is 78 percent (78/100), round-trip min/avg/max = 1/42/204 ms

r-08-in#ping 10.204.211.74 re 100 si 1000

Type escape sequence to abort.

Sending 100, 1000-byte ICMP Echos to 10.204.211.74, timeout is 2 seconds:

!!!!!.!!!!!.!!!!!.!!!!!.!!!!!.!!!!!.!!!!!.!!!!!.!!!!!.!!!!!.!!!!!.!!!!

!.!!!!!.!!!!!.!!!!!.!!!!!.!!!!

Success rate is 84 percent (84/100), round-trip min/avg/max = 1/1/1 ms

Thanks

[Parvesh Paliwal]

OK ...

What is the CPU and Memory usage ???

Can we try to unload some of cables to check if it decreases some traffic ?

Is there any traffic storm on the interface side ? ... may or may not be the cause .. but just a suspect...!!

regards,    

[John Blakley]

Vijay,

Are these phones that you're pinging? They drop packets in order to protect themselves from DoS attacks if that's the case and it's a normal response. I know Avaya phones do this.

John

[Parvesh Paliwal]

Hello Blakley,

Can you please post some link favouring the feature ??

Have a nice time !!

Regards,

Parvesh

[Parvesh Paliwal]

@

j.blakley

Any one have such documentation please.

@Vijay Diwan

Issue resolved  ?

[smehrnia]

Hi Parvesh,

this is a Doc about avaya phone features, which states that feature:

http://www.avaya.com/usa/resource/assets/factsheet/1608%20-%20LB3383.pdf

i guess this DoS protection is embedded in the device.

HTH,

Soroush.