Not able to do a show interface "port" for ports 49 and 50 (dont know why). Is it because these are SFP ports?

Anyway, I did a show interface and shown below is the output for 49 and 50. 49 is showing greed, while 50 is amber:

***************************************************************

GigabitEthernet1/0/49 is up, line protocol is up (connected)

Hardware is Gigabit Ethernet, address is 0016.c7f7.a831 (bia 0016.c7f7.a831)

MTU 1500 bytes, BW 1000000 Kbit, DLY 10 usec,

reliability 255/255, txload 1/255, rxload 1/255

Encapsulation ARPA, loopback not set

Keepalive not set

Full-duplex, 1000Mb/s, link type is auto, media type is 1000BaseSX SFP

input flow-control is off, output flow-control is unsupported

ARP type: ARPA, ARP Timeout 04:00:00

Last input 00:00:01, output 00:00:17, output hang never

Last clearing of "show interface" counters never

Input queue: 0/75/0/0 (size/max/drops/flushes); Total output drops: 0

Queueing strategy: fifo

Output queue: 0/40 (size/max)

5 minute input rate 1000 bits/sec, 1 packets/sec

5 minute output rate 1000 bits/sec, 1 packets/sec

83696 packets input, 15488039 bytes, 0 no buffer

Received 46220 broadcasts (0 multicast)

0 runts, 0 giants, 0 throttles

0 input errors, 0 CRC, 0 frame, 0 overrun, 0 ignored

0 watchdog, 30403 multicast, 0 pause input

0 input packets with dribble condition detected

162927 packets output, 71484021 bytes, 0 underruns

0 output errors, 0 collisions, 5 interface resets

0 babbles, 0 late collision, 0 deferred

0 lost carrier, 0 no carrier, 0 PAUSE output

0 output buffer failures, 0 output buffers swapped out

GigabitEthernet1/0/50 is up, line protocol is up (connected)

Hardware is Gigabit Ethernet, address is 0016.c7f7.a832 (bia 0016.c7f7.a832)

MTU 1500 bytes, BW 1000000 Kbit, DLY 10 usec,

reliability 255/255, txload 1/255, rxload 1/255

Encapsulation ARPA, loopback not set

Keepalive not set

Full-duplex, 1000Mb/s, link type is auto, media type is 1000BaseSX SFP

input flow-control is off, output flow-control is unsupported

ARP type: ARPA, ARP Timeout 04:00:00

Last input 00:00:00, output 00:00:23, output hang never

Last clearing of "show interface" counters never

Input queue: 0/75/0/0 (size/max/drops/flushes); Total output drops: 0

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

118803 packets input, 9003642 bytes, 0 no buffer

Received 118281 broadcasts (0 multicast)

0 runts, 0 giants, 0 throttles

0 input errors, 0 CRC, 0 frame, 0 overrun, 0 ignored

0 watchdog, 113959 multicast, 0 pause input

0 input packets with dribble condition detected

29254 packets output, 10447720 bytes, 0 underruns

0 output errors, 0 collisions, 1 interface resets

0 babbles, 0 late collision, 0 deferred

0 lost carrier, 0 no carrier, 0 PAUSE output

0 output buffer failures, 0 output buffers swapped out

***************************************************************

Any ideas?

There is no command such as "show interface port" which is why you can't do it, you can't do that command on any of the ports, it's "show interface gig x/y/z". Now, the "port" or interface is amber because it's most likely in blocking state - 49 and 50 are probably connected to the same switch. How can you check if it's in "blocking" mode?

sh spanning-tree blockedports

sh spanning-tree interface gig 1/0/50

http://www.cisco.com/univercd/cc/td/doc/product/wireless/c3750wlc/hig/higoverv.htm#wp1134782

Table 1-7 Meaning of LED Colors in Different Modes on the Switch

Amber

Port is blocked by Spanning Tree Protocol (STP) and is not forwarding data.

Note: After a port is reconfigured, the port LED can remain amber for up to 30 seconds as STP checks the switch for possible loops.

Please rate this post if it helped.

Thanks for the reply,

That helped. At least I now know that the port is blocking. Here is the ourput from those commands:

switch404#sh spanning-tree blockedports

Name Blocked Interfaces List

-------------------- ------------------------------------

VLAN0001 Gi1/0/50

Number of blocked ports (segments) in the system : 1

switch#sh spanning-tree interface gig 1/0/50

Vlan Role Sts Cost Prio.Nbr Type

---------------- ---- --- --------- -------- --------------------------------

VLAN0001 Altn BLK 4 128.50 P2p

switch#

Now, what do I need to do to unblock?

etherchannel

you need to understand STP, at current STP situation, I don't think you want to unblock it. It is not blcking because it's broken or anything, the STP is protecting you from a loop.

Please rate helpful posts.

OK (thanks),

I understand that you are saying that this blocking is by design. We have redundant fiber linking 5 switches, so it makes some sense to me that 2 of the switches have a blocking port as the nominal situation.

Would you be able to point me to a document for better understanding of STP.

Here you can read some details:

http://www.cisco.com/en/US/tech/tk389/tk621/technologies_white_paper09186a0080094cfa.shtml

bye

FCS

Please rate me if I helped.

here's a good link for all spanningTree flavors:

http://www.cisco.com/en/US/tech/tk389/tk621/tsd_technology_support_protocol_home.html

look in the 'configuration examples and techNotes' for 'understanding stp' guides.