Cisco Catalyst SD-WAN Interfaces Configuration Guide, Releases 26.x and Later

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Verify configurations on subinterfaces

Updated: April 24, 2026

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Provides verification procedures for subinterface configurations, outlining methods to confirm connectivity, validate settings, and troubleshoot network issues associated with subinterfaces.

This section provides details on how to verify configurations on subinterfaces.

Configuration example to display information about interface speed and MTU

To display the actual speed of each interface, use the show interfaces command. The following example displays interface information on all interfaces. 

Device# show interfaces
GigabitEthernet0/0/0 is up, line protocol is up
  Hardware is ISR4331-3x1GE, address is 084f.f99b.267c (bia 084f.f99b.267c)
  Description: INET
  Internet address is 10.3.6.2/24
  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 RJ45
  output flow-control is off, input flow-control is off
  ARP type: ARPA, ARP Timeout 00:20:00
  Last input 00:00:00, output 00:00:00, output hang never
  Last clearing of "show interface" counters never
  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 2000 bits/sec, 2 packets/sec
  5 minute output rate 1000 bits/sec, 1 packets/sec
     235182 packets input, 23708237 bytes, 0 no buffer
     Received 1 broadcasts (0 IP multicasts)
     0 runts, 0 giants, 0 throttles
     0 input errors, 0 CRC, 0 frame, 0 overrun, 0 ignored
     0 watchdog, 170048 multicast, 0 pause input
     71585 packets output, 12131971 bytes, 0 underruns
     Output 6 broadcasts (0 IP multicasts)
     0 output errors, 0 collisions, 1 interface resets
     1 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 ISR4331-3x1GE, address is 084f.f99b.267d (bia 084f.f99b.267d)
  Description: Service
  Internet address is 10.3.13.2/24
  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 RJ45
  output flow-control is off, input flow-control is off
  ARP type: ARPA, ARP Timeout 00:20:00
  Last input 00:00:00, output 00:00:14, output hang never
  Last clearing of "show interface" counters never
  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 0 bits/sec, 0 packets/sec
  5 minute output rate 0 bits/sec, 0 packets/sec
     144332 packets input, 13390830 bytes, 0 no buffer
     Received 0 broadcasts (0 IP multicasts)
     0 runts, 0 giants, 0 throttles
     0 input errors, 0 CRC, 0 frame, 0 overrun, 0 ignored
     0 watchdog, 144332 multicast, 0 pause input
     13613 packets output, 5135370 bytes, 0 underruns
     Output 1 broadcasts (0 IP multicasts)
     0 output errors, 0 collisions, 1 interface resets
     1 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
<output truncated>