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meiyappan
Beginner

Ether channel interface suspended mode

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

 

1 ACCEPTED SOLUTION

Accepted Solutions
Leo Laohoo
VIP Community Legend

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.  

View solution in original post

6 REPLIES 6
Leo Laohoo
VIP Community Legend

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.

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
VIP Community Legend

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.  

View solution in original post

thank you leo  let me check 

 

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

 

thanks 

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