[nsp] 802.3x flow control in Catalyst 3550

[Jonas Stenling]

I'm wondering how one should decipher the following command output:

GigabitEthernet0/4 is up, line protocol is up
  Hardware is Gigabit Ethernet, address is 000b.5f7a.0b84 (bia
000b.5f7a.0b84)
  Description: RTR1
  MTU 1530 bytes, BW 1000000 Kbit, DLY 10 usec,
     reliability 255/255, txload 1/255, rxload 1/255
  Encapsulation ARPA, loopback not set
  Keepalive set (10 sec)
  Full-duplex mode, link type is force-up, media type is SX
  output flow-control is unsupported, input flow-control is unsupported,
1000Mb/s
  input flow-control is on, output flow-control is on

send/receive flow control is enabled on this port. What is the
"flow-control is unsupported" stuff about? Is the second line the
negotiated parameters?

Thanks!

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