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Beginner

Huge broadcast counters and input/output errors without drops

Hi. Trying to make an aggregated port (two 1Gb links)

asr1001x <-----> juniper ex4200

Juniper side reports that there are no issues (no drops or errors). But cisco port-channel shows some crazy output.

 

asr1.core#sh int port-channel 1
Port-channel1 is up, line protocol is up 
  Hardware is GEChannel, address is 4001.7aa9.bfc0 (bia 4001.7aa9.bfc0)
  MTU 1500 bytes, BW 2000000 Kbit/sec, DLY 10 usec, 
     reliability 255/255, txload 1/255, rxload 1/255
  Encapsulation 802.1Q Virtual LAN, Vlan ID  1., loopback not set
  Keepalive set (10 sec)
  ARP type: ARPA, ARP Timeout 04:00:00
    No. of active members in this channel: 2 
        Member 0 : GigabitEthernet0/0/4 , Full-duplex, 1000Mb/s
        Member 1 : GigabitEthernet0/0/5 , Full-duplex, 1000Mb/s
    No. of PF_JUMBO supported members in this channel : 2
  Last input 00:00:00, output never, output hang never
  Last clearing of "show interface" counters 00:12:39
  Input queue: 0/750/0/0 (size/max/drops/flushes); Total output drops: 0
  Queueing strategy: fifo
  Output queue: 0/80 (size/max)
  5 minute input rate 22000 bits/sec, 25 packets/sec
  5 minute output rate 167000 bits/sec, 25 packets/sec
     6835 packets input, 787595 bytes, 0 no buffer
     Received 18446744073709478303 broadcasts (0 IP multicasts)
     0 runts, 0 giants, 0 throttles 
     4294967264 input errors, 0 CRC, 0 frame, 0 overrun, 0 ignored
     0 watchdog, 3627 multicast, 0 pause input
     9522 packets output, 8805514 bytes, 0 underruns
     4294271840 output errors, 0 collisions, 0 interface resets
     5 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

Such value shows as soon as I reset counters. The only similar issue I found on the internet was about cisco 3750 old IOS version.

asr1.core#sh etherchannel summary 
Flags:  D - down        P/bndl - bundled in port-channel
        I - stand-alone s/susp - suspended
        H - Hot-standby (LACP only)
        R - Layer3      S - Layer2
        U - in use      f - failed to allocate aggregator

        M - not in use, minimum links not met
        u - unsuitable for bundling
        w - waiting to be aggregated
        d - default port


Number of channel-groups in use: 1
Number of aggregators:           1

Group  Port-channel  Protocol    Ports
------+-------------+-----------+-----------------------------------------------
1       Po1(RU)         LACP     Gi0/0/4(bndl) Gi0/0/5(bndl)

RU - L3 port-channel UP State
SU - L2 port-channel UP state
P/bndl -  Bundled
S/susp  - Suspended

 

Both interfaces on port-channel 1 are showing some unknow protocol drops:

 

asr1.core#sh int gigabitEthernet 0/0/4   
GigabitEthernet0/0/4 is up, line protocol is up 
  Hardware is BUILT-IN-2T+6X1GE, address is 4001.7aa9.bfc0 (bia 4001.7aa9.bf86)
  MTU 1500 bytes, BW 1000000 Kbit/sec, DLY 10 usec, 
     reliability 255/255, txload 1/255, rxload 1/255
  Encapsulation ARPA, loopback not set
  Keepalive not supported 
  Full Duplex, 1000Mbps, link type is auto, media type is T
  output flow-control is on, input flow-control is on
  ARP type: ARPA, ARP Timeout 04:00:00
  Last input 00:00:06, output 00:00:05, output hang never
  Last clearing of "show interface" counters 01:27:21
  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 6000 bits/sec, 8 packets/sec
  5 minute output rate 121000 bits/sec, 6 packets/sec
     38717 packets input, 7039353 bytes, 0 no buffer
     Received 934 broadcasts (0 IP multicasts)
     0 runts, 0 giants, 0 throttles 
     2 input errors, 0 CRC, 0 frame, 0 overrun, 0 ignored
     0 watchdog, 3824 multicast, 0 pause input
     210655 packets output, 243981246 bytes, 0 underruns
     0 output errors, 0 collisions, 6 interface resets
     194 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

asr1.core#sh int gi0/0/5
GigabitEthernet0/0/5 is up, line protocol is up 
Hardware is BUILT-IN-2T+6X1GE, address is 4001.7aa9.bfc0 (bia 4001.7aa9.bf87)
MTU 1500 bytes, BW 1000000 Kbit/sec, DLY 10 usec, 
reliability 255/255, txload 1/255, rxload 1/255
Encapsulation ARPA, loopback not set
Keepalive not supported 
Full Duplex, 1000Mbps, link type is auto, media type is T
output flow-control is on, input flow-control is on
ARP type: ARPA, ARP Timeout 04:00:00
Last input 00:00:09, output 00:00:01, output hang never
Last clearing of "show interface" counters 01:33:54
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 7000 bits/sec, 9 packets/sec
5 minute output rate 46000 bits/sec, 5 packets/sec
48428 packets input, 16134020 bytes, 0 no buffer
Received 131 broadcasts (0 IP multicasts)
0 runts, 0 giants, 0 throttles 
2 input errors, 0 CRC, 0 frame, 0 overrun, 0 ignored
0 watchdog, 5084 multicast, 0 pause input
44119 packets output, 32494841 bytes, 0 underruns
0 output errors, 0 collisions, 7 interface resets
208 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

For now traffic is passing through the aggregated link without problems though I need to test how load balancing is working, but I think it's not important/related right now. Just wanted to clear things out on those errors.

3 REPLIES 3
Highlighted
Hall of Fame Community Legend

Raise a TAC Case.
I remembered reading a Bug ID (can't find it in my email) about a ridiculous amount of line errors affecting IOS-XE.
Highlighted
VIP Expert

Hello,

 

I think I remember the bug Leo is referring to:

 

Show interface counters on IOS-XE platforms do not report correct values. Counters too high.
CSCvg41224
Description
Symptom:
An IOS-XE based router or switch may show an extremely high number for different values in the "show interface" output. Some of the more common symptoms include:
20 digit counter for packets input, packets output, or broadcasts input
20 digit counter for bytes input or output
10 digit counter for input errors, CRCs, or frame errors

Conditions:
First seen on ASRs running 16.3.3 and 15.6(2)SP2
First seen on 3850/3650 running 16.3.1 and 16.6.1
First seen on Cat9400 running 16.6.1

It is likely other platforms that run these IOS-XE releases may also be impacted.

Workaround:
Clearing counters may clear the condition.

Further Problem Description:
The exact trigger for this issue is not currently known, and no service impact is associated with these counters being

Highlighted
Hall of Fame Community Legend

Good find, Georg.