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Port-channel down but duplicate interface created with "B" up

Marco Aresu
Level 1
Level 1

Hi all

I have created 1 new port channels on a 6509 connected to ASR1002

Below the show about the Port-Channel

Port-channel9             unassigned      YES unset  down                  down     

Port-channel9B            unassigned      YES unset  up                    up

Can someone explain what this is any why it is occurring?

Thanks

Marco

4 Replies 4

Lei Tian
Cisco Employee
Cisco Employee

Hi Marco,

Is that on the 6500 side or ASR side? Do a show interface po3B, and show run int po3B.

HTH
Lei Tian

Sent from Cisco Technical Support iPhone App

Hi Lei

is on 6500 side.

c6509e-00#sh int po9B

Port-channel9B is up, line protocol is up (connected)

  Hardware is EtherChannel, address is 001d.456d.ca59 (bia 001d.456d.ca59)

  MTU 1500 bytes, BW 2000000 Kbit, 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, media type is unknown

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

  Members in this channel: Gi8/10 Gi8/36

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

  Last input never, 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: 0

  Queueing strategy: fifo

  Output queue: 0/40 (size/max)

  5 minute input rate 1076000 bits/sec, 882 packets/sec

  5 minute output rate 8490000 bits/sec, 1399 packets/sec

     11961422 packets input, 3534458687 bytes, 0 no buffer

     Received 6087 broadcasts (6077 multicasts)

     0 runts, 0 giants, 0 throttles

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

     0 watchdog, 0 multicast, 0 pause input

     0 input packets with dribble condition detected

     18223769 packets output, 13177086156 bytes, 0 underruns

     0 output errors, 0 collisions, 2 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

c6509e-00#sh run int po9

Building configuration...

Current configuration : 135 bytes

!

interface Port-channel9

switchport

switchport access vlan 181

switchport mode access

end

thanks

Marco

Lei Tian
Cisco Employee
Cisco Employee

Hi Marco,

Do search 'spawn port channel' on google, and you should find similar cases. Basically, it was caused by mis-configuration on port channel.

HTH,
Lei Tian

Sent from Cisco Technical Support iPhone App

Hi Marco,

this is called a "secondary aggregator port".

Like Lei has already stated, it's typically caused by misconfiguration between the member-ports.

Here you can find a similar discussion, I think it will provide you with all the information:

https://supportforums.cisco.com/message/3352041

Best regards

Rolf

Review Cisco Networking products for a $25 gift card