ASR 9000 - Monitor NP Interface command

[JohnTylerPearce]

If I have IOS XR Code 6.1.4, can I run the 'monitor np interface' command and not cause any NP blips? For example, if I want to run it on a sub-interface going towards a customer? I know if you do 'monitor np capture' that will cause a 50ms blip, but I didn't know if that would happen as well with the 'monitor np interface' command or not.

I know you can do a show command to look at either 128 or 32 hits in the Linecard Buffer depending on the Linecard, but wanted to actively look at drops off a sub-interface without causing a blip to the NP.

[smilstea · Accepted solution]

5.3.3 got rid of the 50ms hit with monitor np counter, we also introduce monitor np interface so that you monitor just for a particular interface not the whole np, and show controller np capture is a rotating log of drops on the NP.

The easiest way is to have TAC do this as we have a tool that can read the hex and output it as a pcap in seconds.

Sam

[JohnTylerPearce]

Thank you for the information, I really appreciate it. So if I were to do a 'monitor np interface x/x/x/x etc' it would not cause any hits to the NP, and or wouldn't cause any traffic drops for the customer? Granted I want to do this on a sub-interface mainly.

[smilstea]

Just did this yesterday on a bundle sub-int and it worked perfectly. No reset between captures.

[chatsai]

Sam,

I have some questions:

#1) Can you confirm that the 50 ms hit to traffic problem has been fixed in 6.1.4 and 6.4.2?

#2) Can we do a capture on an interface and sub-interface?

#3) How can I access to the TAC tool that converts hex output to PCAP? Can customer access to this tool?

Thanks,

Charlie

[smilstea]

Hi Charlie,

I have already addressed all of this.

1. Yes.
2. Yes
3. Customers cannot, it is internal, but most of the drops will decode straight into wireshark, it is only with a few that like an l2 header is missing etc. The tool just reads each line and strips out unnecessary hex and other characters to build 1 packet at a time.

Sam

[chatsai]

Sam,

Thanks for the answers.

Can I access to the tool? 

Thanks,

Charlie