Una forma simple y sencilla de mostrar el ancho de banda de los interfaces configurados en un router podemos hacer lo siguiente:

show interface | include protocol|BW

y si lo usamos muy a menudo podemos crear un alias:

alias exec bw show interface | include protocol|BW

con lo que con bw tendremos el mismo resultado.

Un ejemplo del resultado:

router#show interface | include protocol|BW
FastEthernet0/0 is administratively down, line protocol is down
  MTU 1500 bytes, BW 100000 Kbit, DLY 100 usec,
Serial1/0 is up, line protocol is up
  MTU 1500 bytes, BW 2000 Kbit, DLY 20000 usec,
Serial1/1 is up, line protocol is up
  MTU 1500 bytes, BW 2000 Kbit, DLY 20000 usec,
Serial1/2 is up, line protocol is up
  MTU 1500 bytes, BW 2000 Kbit, DLY 20000 usec,
Serial1/3 is administratively down, line protocol is down
  MTU 1500 bytes, BW 1544 Kbit, DLY 20000 usec,
Loopback0 is up, line protocol is up
  MTU 1514 bytes, BW 8000000 Kbit, DLY 5000 usec,