Cisco ASR 902

Pi20 · ‎03-03-2022

hello guys,

please need some help with cisco ASR-902 (RSP2) 64

i have 3 routers connected to each other by wireless links PTP

the cisco ASR in in between the 2

ping from each router to the ASR gives high max delay

Success rate is 99 percent (11173/11175), round-trip min/avg/max = 1/5/600 ms

if we change the ASR to another one there is no problem

asr900rsp2-universalk9_npe.03.16.01a.S.155-3.S1a-ext

Georg Pauwen · ‎03-03-2022

Hello,

could be related to control plane policing. The access list that polices ICMP traffic is 'copp-system-acl-icmp'. Check what the value is, and, if you really need ICMP to respond faster, increase the policed rate. If you are just looking for an explanantion of why you see these values, it is because the control plane limits the amount of ICMP traffic.

Check the link below on instructions how to change the control plane policy (if needed):

https://www.cisco.com/c/en/us/td/docs/routers/asr903/software/guide/chassis/xe-3s/b_Config_Guide_fullbook/b-cfg-sdm.html#GUID-6AAE560D-664A-436C-B1FD-26F1C1D02563

Pi20 · ‎03-04-2022

Hello Georg

the problem is also that the traffic dropped so i dont think it is with the control plane icmp

Georg Pauwen · ‎03-05-2022

Hello,

if traffic is being dropped as well, that is obviously another issue. Can you post the output of:

sh interfaces x

where 'x' is the interface that connects to the other router ?

Pi20 · ‎03-07-2022

GigabitEthernet0/0/0 is up, line protocol is up 
  Hardware is A900-IMA8T, address is 9c57.adfe.6880 (bia 9c57.adfe.6880)
  Description: DT-Q-SS056
  MTU 9216 bytes, BW 1000000 Kbit/sec, DLY 10 usec, 
     reliability 255/255, txload 2/255, rxload 1/255
  Encapsulation ARPA, loopback not set
  Keepalive set (10 sec)
  Full Duplex, 1000Mbps, link type is auto, media type is RJ45
  output flow-control is unsupported, input flow-control is on
  ARP type: ARPA, ARP Timeout 04:00:00
  Last input never, output never, output hang never
  Last clearing of "show interface" counters 3d20h
  Input queue: 0/375/0/0 (size/max/drops/flushes); Total output drops: 0
  Queueing strategy: fifo
  Output queue: 0/40 (size/max)
  30 second input rate 1000 bits/sec, 2 packets/sec
  30 second output rate 9582000 bits/sec, 1162 packets/sec
     1012271 packets input, 91073279 bytes, 0 no buffer
     Received 11695 broadcasts (0 IP multicasts)
     0 runts, 0 giants, 0 throttles 
     0 input errors, 0 CRC, 0 frame, 0 overrun, 0 ignored
     0 watchdog, 853533 multicast, 0 pause input
     854323058 packets output, 947816951731 bytes, 0 underruns
     0 output errors, 0 collisions, 0 interface resets
     0 unknown protocol drops
     0 babbles, 0 late collision, 0 deferred
     0 lost carrier, 0 no carrier, 0 pause output
     0 output buffer failures, 0 output buffers swapped out

GigabitEthernet0/0/1 is up, line protocol is up 
  Hardware is A900-IMA8T, address is 9c57.adfe.6881 (bia 9c57.adfe.6881)
  Description: DT-Q-220-700M
  MTU 9216 bytes, BW 1000000 Kbit/sec, DLY 10 usec, 
     reliability 255/255, txload 5/255, rxload 64/255
  Encapsulation ARPA, loopback not set
  Keepalive set (10 sec)
  Full Duplex, 1000Mbps, link type is auto, media type is RJ45
  output flow-control is unsupported, input flow-control is on
  ARP type: ARPA, ARP Timeout 04:00:00
  Last input never, output never, output hang never
  Last clearing of "show interface" counters 3d20h
  Input queue: 0/375/0/0 (size/max/drops/flushes); Total output drops: 0
  Queueing strategy: fifo
  Output queue: 0/40 (size/max)
  5 minute input rate 253506000 bits/sec, 25892 packets/sec
  5 minute output rate 21440000 bits/sec, 11886 packets/sec
     11620639759 packets input, 14688313760621 bytes, 0 no buffer
     Received 11700 broadcasts (0 IP multicasts)
     0 runts, 0 giants, 0 throttles 
     0 input errors, 0 CRC, 0 frame, 0 overrun, 0 ignored
     0 watchdog, 688780 multicast, 0 pause input
     4227830931 packets output, 758934123357 bytes, 0 underruns
     0 output errors, 0 collisions, 0 interface resets
     0 unknown protocol drops
     0 babbles, 0 late collision, 0 deferred
     0 lost carrier, 0 no carrier, 0 pause output
     0 output buffer failures, 0 output buffers swapped out

Please find the the sh interface of the two interfaces connected from each side