Refer to the exhibit. While troubleshooting the network, a network operator with an employee id: 1234:55:678 is trying to ping XR1. Which result should the operator expect when trying to ping to an XR1 local address?
A.
AII ICMP traffic is dropped
B.
AII ICMP traffic responds successfully
C.
ICMP traffic works at a policed rate of 19 bytes per second every 100 ms
D.
ICMP traffic works at a policed rate of 19 packets every 100 ms
Answer should be A, "Ar" is Average rate limit and it's being set 0pps, so all icmp packet destined to the router will be dropped. I verified with my lab XRv9000 with setting.
RP/0/RP0/CPU0:PE1#sh running-config lpts
Fri Jun 11 23:53:01.911 UTC
lpts pifib hardware police
flow icmp local rate 0
!
RP/0/RP0/CPU0:PE1#
RP/0/RP0/CPU0:PE1#show lpts pifib hardware entry location 0/0/Cpu0 | begin ICMP
Fri Jun 11 23:53:41.135 UTC
L4 Protocol : ICMP
VRF ID : any
Destination IP : any
Source IP/BFD Disc: any
Port/Type : Port:8
Source Port : any
Is Fragment : 0
Is SYN : any
Is Bundle : na
Is Virtual : na
Interface : any
Slice : 0
V/L/T/F : 0/IPv4_STACK/0/ICMP-local
DestNode : Local
DestAddr : Punt
Accepted/Dropped : 5/10
Po/Ar/Bu : 12/0pps/750ms
State : pl_pifib_state_complete
I think A is correct!
I also verified and confirmed it with VIRL2 (CML-P).
https://www.cisco.com/c/en/us/td/docs/routers/asr9000/software/asr9k-r6-5/ip-addresses/configuration/guide/b-ip-addresses-cg-asr9000-65x/m-implementing-lpts-asr9000-crs.html
I also believe A is correct. In the full command output the legend says that Ar means Average Rate 'LIMIT', so it is a limit that has been configured.
https://www.cisco.com/c/en/us/td/docs/routers/asr9000/software/asr9k_r4-0/addr_serv/command/reference/ir40asrbook_chapter7.html
I don’t think you can control the average rate though ? I.e you can’t set it to 0, it populate automatically based on the flow that’s coming in over a certain period of time.
As far as I know, this just means it’s been idle for a bit but it’s not configured to 0.
It also has a high number of accepted and a low number of dropped, suggesting it’s working for ICMP most of the time.
C and D aren’t right because the The police rate is in PPS (the Bu is for burst traffic so that 100 isn’t relevant things in the answers).
So I think ICMP traffic responds successfully since there is no average traffic at present, therefor no reason for the police to kick in when an ICMP comes in.
Answer for me I is B
The correct answer is A
tested on ASR9001, set "AR" rate to 0 with this command:
lpts pifib hardware police flow icmp local rate 0
and there were no ICMP replies at all
upvoted 3 times
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