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Participant

Ping Packet Drop from Core-Switch to Directly Connected Server

Hi All,

I have an Cisco 6500 CS and there is a Cisco Unified Communication Manger Server connected directly to the Core Switch.

when we are trting to ping the server the result will be like below:

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

After 4 ! there is one dot .

I tried to change duplex and speed ( fix and auto ) for both sides, but the same problem.

I just need to know if somebody face this before?

Regards,

9 REPLIES 9

Ping Packet Drop from Core-Switch to Directly Connected Server

Hi,

Try to hard code the interface settings to duplex full and speed 100 and check.
Also try to replace the LAN cable in off peak hours.


Please rate the helpfull posts.
Regards,
Naidu.

Participant

Ping Packet Drop from Core-Switch to Directly Connected Server

Hi Latchum,

Thank you for your reply, I already tried to hard code the interface settings for both side and it is mentioned in my fist post.

I do not think it is cable issue because I checked show interface and I did not find errors.

one more thing if it is cable issue then packet drop will not be in regular fashion

Cisco Employee

Re: Ping Packet Drop from Core-Switch to Directly Connected Serv

It’s working as designed. CUCM will drop one in 4-5 packets to prevent DOS ping floods.

Participant

Ping Packet Drop from Core-Switch to Directly Connected Server

Hi Dijohn,

+5 for your good news

and I will give you another + 5 with correct answer if you can send me something from Cisco to send it to my customer

Regards,

Contributor

Ping Packet Drop from Core-Switch to Directly Connected Server

How about you give him part of the cut and he gives you +5 on here

Glad you got it resolved. 

Participant

Ping Packet Drop from Core-Switch to Directly Connected Server

Simply I gave + 5 because it is really helpful for me and it answers my question because I saw this in many locations.

but I did not mark it as resolved because I really still need dijohn help to send something to prove this to my customer

So please dijohn  I am still waiting your help

Highlighted
Cisco Employee

Re: Ping Packet Drop from Core-Switch to Directly Connected Serv

http://www.cisco.com/en/US/tech/tk1077/technologies_tech_note09186a008010edb8.shtml

“Note: Cisco IP Phones 7902/05/12 have a different code base from the Cisco 7940/60. Consequently, there is a delayed reply to the network ping with the 7902/05/12, but not the 7940/60.

Note: Also, for Cisco Unified CM, this behavior exists and the ICMP will be throttled in order to prevent DoS attacks.

Participant

Ping Packet Drop from Core-Switch to Directly Connected Server

Thank you man

as I promised

Contributor

Ping Packet Drop from Core-Switch to Directly Connected Server

Glad you got it fully resolved

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