here is the interface:
r1#
r1#
r1#show inter ser1 full
r1#show inter ser1 full
serial1 is up (since 00:00:02, 2 changes)
 description:
 type is serial, hwaddr=none, mtu=1500, bw=2000kbps, vrf=v1
 ip4 address=1.1.1.1/24, netmask=255.255.255.0, ifcid=10011
 ip6 address=1234::1/16, netmask=ffff::, ifcid=10011
 received 22 packets (2244 bytes) dropped 0 packets (0 bytes)
 transmitted 22 packets (2244 bytes) promisc=false
 |~~~~~~~|~~~~~~|~~~~~~~~~|~~~~~~|~~~~~~|~~~~~~~~~|~~~~~~|
 | time  | send | receive | drop | send | receive | drop |
 |-------|------|---------|------|------|---------|------|
 | 1sec  | 812  | 812     | 0    | 8    | 8       | 0    |
 | 1min  | 0    | 0       | 0    | 0    | 0       | 0    |
 | 1hour | 0    | 0       | 0    | 0    | 0       | 0    |
 |_______|______|_________|______|______|_________|______|
 |~~~~~~~~|~~~~~~~|~~~~~~~~~|~~~~~~|~~~~~~|~~~~~~|
 | type   | value | handler | tx   | rx   | drop |
 |--------|-------|---------|------|------|------|
 | ethtyp | 0800  | ip4     | 940  | 940  | 0    |
 | ethtyp | 86dd  | ip6     | 1304 | 1304 | 0    |
 |________|_______|_________|______|______|______|
         12k|
         11k|#
         10k|#
        9094|##
        7795|##
        6496|##
        5196|##
        3897|##
        2598|##
        1299|##
           0|##
         bps|0---------10--------20--------30--------40--------50-------- seconds
          16|
          14|#
          12|##
          11|##
           9|##
           8|##
           6|##
           4|##
           3|##
           1|##
           0|##
         pps|0---------10--------20--------30--------40--------50-------- seconds
r1#
r1#