Router Interface Statistics Help (Physical & Sub-Interfaces)

Hamidsattarrana · ‎10-29-2021

Hello

Hope you guys are well!

I need some help regarding interface statistics. Below are the interface statistics.

Core-Router#show interfaces gigabitEthernet 0/0
GigabitEthernet0/0 is up, line protocol is up
Hardware is BCM1125 Internal MAC, address is 68bd.abbd.d720 (bia 68bd.abbd.d720)
Description: WAN
MTU 1500 bytes, BW 1000000 Kbit/sec, DLY 10 usec,
reliability 255/255, txload 2/255, rxload 3/255
Encapsulation 802.1Q Virtual LAN, Vlan ID 1., loopback not set
Keepalive not set
Full-duplex, 1000Mb/s, media type is RJ45
output flow-control is XON, input flow-control is XON
ARP type: ARPA, ARP Timeout 04:00:00
Last input 00:00:00, output 00:00:00, output hang never
Last clearing of "show interface" counters 1d19h
Input queue: 0/75/0/350 (size/max/drops/flushes); Total output drops: 0
Queueing strategy: fifo
Output queue: 0/40 (size/max)
30 second input rate 15593000 bits/sec, 2757 packets/sec
30 second output rate 8791000 bits/sec, 2352 packets/sec
210324652 packets input, 2803268500 bytes, 88 no buffer
Received 378640 broadcasts, 0 runts, 0 giants, 5 throttles
6 input errors, 0 CRC, 0 frame, 6 overrun, 0 ignored
0 watchdog, 595202 multicast, 0 pause input
0 input packets with dribble condition detected
123517844 packets output, 1758071145 bytes, 0 underruns
0 output errors, 0 collisions, 0 interface resets
5185 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

It says 6 input errors and 6 Overrun.

88 no buffer

And 1 more thing there are 4 ISPs configured on the same interface gig 0/0. How can I check the errors on specific Sub-Interface?

Router is 3845

The output of show interface gig 0/0.200 is below but it does not show any errors:

Core-Router#show int gig 0/0.200
GigabitEthernet0/0.200 is up, line protocol is up
Hardware is BCM1125 Internal MAC, address is 68bd.abbd.d720 (bia 68bd.abbd.d720)
Description: WAN-NEXLINK
Internet address is 102.59.56.85/29
MTU 1500 bytes, BW 1000000 Kbit/sec, DLY 10 usec,
reliability 255/255, txload 1/255, rxload 4/255
Encapsulation 802.1Q Virtual LAN, Vlan ID 200.
ARP type: ARPA, ARP Timeout 04:00:00
Last clearing of "show interface" counters never

Georg Pauwen · ‎10-29-2021

Hello,

unfortunately, you cannot get the same statistics for logical/sub interfaces. I think XR show some more stats, but not in (XE) IOS.

Joseph W. Doherty · ‎10-29-2021

One would expect (or hope) physical interface errors only reported on the physical interface. Plus, logically, a bit pointless to note such errors on ever subinterface (which might lead you to believe you actual errors time the number of subinterfaces errors - BTW, I recall seeing on some Cisco switch some physical errors "replicated" on every port being controlled by the same ASIC - clue this was the case, each port had exactly the same count for those errors).