Ether channel interface suspended mode

[meiyappan]

Connection between our core switch to access switch is showing suspended for etherchannel interface  

interface GigabitEthernet1/0/2
  switchport mode trunk
 channel-group 2 mode on
end

interface GigabitEthernet1/0/1
 switchport mode trunk
 channel-group 2 mode on
end

interface Port-channel2
 switchport mode trunk

GigabitEthernet1/0/1 is up, line protocol is down (suspended)

GigabitEthernet1/0/1 is up, line protocol is down (suspended) 
    MTU 1500 bytes, BW 100000 Kbit, DLY 100 usec, 
     reliability 255/255, txload 1/255, rxload 1/255
  Encapsulation ARPA, loopback not set
  Keepalive set (10 sec)
  Full-duplex, 100Mb/s, media type is 10/100/1000BaseTX
  input flow-control is off, output flow-control is unsupported 
  ARP type: ARPA, ARP Timeout 04:00:00

GigabitEthernet1/0/2 is up, line protocol is up (connected) 
  MTU 1500 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, 1000Mb/s, media type is 10/100/1000Base

Logs:

TX%EC-5-CANNOT_BUNDLE2: Gi1/0/1 is not compatible with Gi1/0/2 and will be suspended (speed of Gi1/0/1 is 100M, Gi1/0/2 is 1000M)

why the speed is varying but i was configured as auto  , Kindly suggest 

Gi1/0/2    connected    trunk      a-full a-1000 10/100/1000BaseTX

Gi1/0/1    suspended    trunk      a-full  a-100 10/100/1000BaseTX

[Leo Laohoo]

TX%EC-5-CANNOT_BUNDLE2: Gi1/0/1 is not compatible with Gi1/0/2 and will be suspended (speed of Gi1/0/1 is 100M, Gi1/0/2 is 1000M)
Gi1/0/2    connected    trunk      a-full a-1000 10/100/1000BaseTX
Gi1/0/1    suspended    trunk      a-full  a-100 10/100/1000BaseTX

Make sense.  Look at the speed of both ports.  They are not the same.  And this is why Gi1/0/1 is suspended. 

Gi 1/0/1 could potentially have a faulty cable.  You could try running a TDR to determine.  

1.  Command:  test cable tdr interface Gi 1/0/1; 

2.  Wait for approximately 5 to 7 seconds; 

3.  Command:  sh cable tdr interface Gi 1/0/1; 

4.  Post the output to #3.

[meiyappan]

logs :

Interface Speed Local pair Pair length        Remote pair Pair status
--------- ----- ---------- ------------------ ----------- --------------------
Gi1/0/1   100M  Pair A     36   +/- 0  meters N/A         Normal              
                Pair B     37   +/- 1  meters N/A         Short/Crosstalk     
                Pair C     74   +/- 0  meters N/A         Normal              
                Pair D     37   +/- 1  meters N/A         Short/Crosstalk

[Leo Laohoo · Accepted solution]

Ok.  Thanks for the output. 

Output tells me you've got a cable problem at the remote end of Gi 1/0/1.  Maybe the patch cable or could be the punch block.  

If you want GigabitEthernet speed then Pairs A, B and D must be NORMAL.  

[meiyappan]

thank you leo  let me check 

[meiyappan]

there was issue in patch panel port is not supporting  the speed, after changing to other port  its fine.

thanks 

[muneebnadeem5]

Interface Speed Local pair Pair length Remote pair Pair status
--------- ----- ---------- ------------------ ----------- --------------------
Gi0/45 100M Pair A 25 +/- 4 meters Pair A Normal
Pair B 4 +/- 4 meters Pair B Open
Pair C 24 +/- 4 meters Pair C Normal
Pair D 25 +/- 4 meters Pair D Normal

2nd switch


Interface Speed Local pair Pair length Remote pair Pair status
--------- ----- ---------- ------------------ ----------- --------------------
Gi0/43 100M Pair A 25 +/- 4 meters Pair B Normal
Pair B 20 +/- 4 meters Pair A Open
Pair C 25 +/- 4 meters Pair C Normal
Pair D 25 +/- 4 meters Pair D Normal

[TYFANAN]

Hi all community fellows. Just to share my experience and how I solved the problem. My situation looks like that - a Cisco UCS C240 M4S2 server connected with four ports to two Cisco 3850 switches in a stack. There are two ports connected to each switch in a stack. All four ports on the 3850 are in a port channel. After some maintenance in the rack the issue - "%ETC-5-CANNOT_BUNDLE2: Gi1/1/1 is not compatible with Gi1/1/2 and will be suspended (speed of Gi1/1/1 is 100M, Gi1/1/2 is 1000M)" appears on 3850. Port channel went down and I lost connectivity between the server and the switch. Reading the posts above I try to check all the connections - cables, jacks and inserts connecting the devices. It appears to be one of the cables with interrupted wire 5, so making possible only 100 M of speed for this connection. Replacing the faulty wire fix the problem for me. So check all physical elements before experiment with any settings. This is it. I solved my problem. Hope to help someone this way.