Hello All,
I have a 4948E-10G that doesn't have any devices attached, but it does have a one port loopback and its generating traffic. Is that normal?
Specifically, I have a SFP installed in Te1/49. That SFP is attached to a fiber that goes out 13 miles and is looped back with a physical jumper at the far end. We did this just to verify the fiber was good. I'm seeing packets on the output and input, and they're all Multicast. Is that normal? See below. Thanks Kevin.
Cisco IOS Software, Catalyst 4500 L3 Switch Software (cat4500e-IPBASEK9-M), Version 15.2(2)E6, RELEASE SOFTWARE (fc1)
TenGigabitEthernet1/49 is up, line protocol is up (connected)
Hardware is Ten Gigabit Ethernet Port, address is 442b.0362.8130 (bia 442b.0362.8130)
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 set (10 sec)
Full-duplex, 1000Mb/s, link type is auto, media type is 1000BaseLH
input flow-control is on, output flow-control is off
ARP type: ARPA, ARP Timeout 04:00:00
Last input 00:00:17, output never, output hang never
Last clearing of "show interface" counters never
Input queue: 0/2000/0/0 (size/max/drops/flushes); Total output drops: 35
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
1180 packets input, 171253 bytes, 0 no buffer
Received 1180 broadcasts (1180 multicasts)
0 runts, 0 giants, 0 throttles
0 input errors, 0 CRC, 0 frame, 0 overrun, 0 ignored
0 input packets with dribble condition detected
1181 packets output, 171765 bytes, 0 underruns
0 output errors, 0 collisions, 6 interface resets
0 unknown protocol drops
0 babbles, 0 late collision, 0 deferred
0 lost carrier, 0 no carrier
0 output buffer failures, 0 output buffers swapped out
