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10GbE Interface - loopback line, no output rate

Hello all,

When doing some tests using the ‘loopback line’ on a 10GbE interface in an ASR9000, we noticed that we don't have output rate, although the test device receive all the generated traffic back. The interface configuration is rather simple:

RP/0/RSP0/CPU0:Pessoa#sh run int tenGigE 0/0/0/2

Thu Feb 16 11:59:14.431 WET

interface TenGigE0/0/0/2

description Testes 10 GbE RFS

mtu 9192

loopback line

carrier-delay up 5000 down 0

load-interval 30

dampening

When checking the input and output rate:

RP/0/RSP0/CPU0:Pessoa#

RP/0/RSP0/CPU0:Pessoa#sh int tenGigE 0/0/0/2 | i rate

Thu Feb 16 12:01:40.476 WET

  30 second input rate 7918041000 bits/sec, 1448815 packets/sec

  30 second output rate 0 bits/sec, 0 packets/sec

RP/0/RSP0/CPU0:Pessoa#

RP/0/RSP0/CPU0:Pessoa#sh int tenGigE 0/0/0/2 | i rate

Thu Feb 16 12:02:05.307 WET

  30 second input rate 9166768000 bits/sec, 1677058 packets/sec

  30 second output rate 0 bits/sec, 0 packets/sec

RP/0/RSP0/CPU0:Pessoa#

RP/0/RSP0/CPU0:Pessoa#

RP/0/RSP0/CPU0:Pessoa#sh int tenGigE 0/0/0/2 | i rate

Thu Feb 16 12:02:07.321 WET

  30 second input rate 9212136000 bits/sec, 1685490 packets/sec

  30 second output rate 0 bits/sec, 0 packets/sec

RP/0/RSP0/CPU0:Pessoa#

RP/0/RSP0/CPU0:Pessoa#

The same tests were done using a 1GbE interface and every think was OK, with output rate ~= input rate.

Any ideia? I've done some research in bug toolkit but didn't find any bug related to this...

By the way, IOS-XR version is 4.0.1.

Thanks & Regards,

Pedro

  • XR OS and Platforms
Everyone's tags (4)
1 REPLY
Cisco Employee

Re: 10GbE Interface - loopback line, no output rate

Hi Pedro,

Is that only rate affected or do you see 0 output packets too?

Do you see any output rate without the loopback line command?

Do you see any rates/output using

show controllers tenGigE 0/0/0/2 stats

show int tenGigE 0/0/0/2 acc

show int tenGigE 0/0/0/2 accounting rates

Regards,

/A

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