here is the interface:
r1#
r1#
r1#show inter ser1 full
r1#show inter ser1 full
serial1 is up (since 00:00:01, 2 changes)
 description:
 type is serial, hwaddr=none, mtu=1498, 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 20 packets (2080 bytes) dropped 0 packets (0 bytes)
 transmitted 22 packets (2244 bytes) promisc=false
 |~~~~~~~|~~~~~~|~~~~~~~~~|~~~~~~|~~~~~~|~~~~~~~~~|~~~~~~|
 | time  | send | receive | drop | send | receive | drop |
 |-------|------|---------|------|------|---------|------|
 | 1sec  | 1104 | 940     | 0    | 12   | 10      | 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 | 1140 | 0    |
 |________|_______|_________|______|______|______|
         16k|
         14k|#
         13k|#
         11k|#
        9811|#
        8176|#
        6540|#
        4905|#
        3270|#
        1635|#
           0|#
         bps|0---------10--------20--------30--------40--------50-------- seconds
          22|
          19|#
          17|#
          15|#
          13|#
          11|#
           8|#
           6|#
           4|#
           2|#
           0|#
         pps|0---------10--------20--------30--------40--------50-------- seconds
r1#
r1#