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Ether channel not working

chakradhar bolla
Level 1
Level 1

‎09-24-2012 12:09 AM - edited ‎03-07-2019 09:03 AM

                   Hi,

I was configured ether channel between two cisco 2960s series switches.It is working properly.i was replaced two cables in etherchannel.Now one link working remining link is down(both cables are working cables only).please find below ether channel details

CORESWITCH#show etherchannel detail
                Channel-group listing:
                ----------------------

Group: 1
----------
Group state = L2
Ports: 3   Maxports = 8
Port-channels: 1 Max Port-channels = 1
Protocol:   PAgP
Minimum Links: 0
                Ports in the group:
                -------------------
Port: Gi0/42
------------

Port state    = Up Mstr In-Bndl
Channel group = 1           Mode = Desirable-Sl    Gcchange = 0
Port-channel  = Po1         GC   = 0x00010001      Pseudo port-channel = Po1
Port index    = 0           Load = 0x00            Protocol =   PAgP

Flags:  S - Device is sending Slow hello.  C - Device is in Consistent state.
        A - Device is in Auto mode.        P - Device learns on physical port.
        d - PAgP is down.
Timers: H - Hello timer is running.        Q - Quit timer is running.
        S - Switching timer is running.    I - Interface timer is running.

Local information:
                                Hello    Partner  PAgP     Learning  Group
Port      Flags State   Timers  Interval Count   Priority   Method  Ifindex
Gi0/42    SC    U6/S7   H       30s      1        128        Any      5001

Partner's information:

          Partner              Partner          Partner         Partner Group
Port      Name                 Device ID        Port       Age  Flags   Cap.
Gi0/42    NEWBUILDINGSWITCH    08d0.9fbb.8e80   Gi1/0/45    15s SAC     10001

Age of the port in the current state: 0d:00h:52m:18s

Port: Gi0/43
------------

Port state    = Down Not-in-Bndl
Channel group = 1           Mode = Desirable-Sl    Gcchange = 0
Port-channel  = null        GC   = 0x00000000      Pseudo port-channel = Po1
Port index    = 0           Load = 0x00            Protocol =   PAgP

Flags:  S - Device is sending Slow hello.  C - Device is in Consistent state.
        A - Device is in Auto mode.        P - Device learns on physical port.
        d - PAgP is down.
Timers: H - Hello timer is running.        Q - Quit timer is running.
        S - Switching timer is running.    I - Interface timer is running.

Local information:
                                Hello    Partner  PAgP     Learning  Group
Port      Flags State   Timers  Interval Count   Priority   Method  Ifindex
Gi0/43    d     U1/S1           1s       0        128        Any      0

Age of the port in the current state: 0d:00h:42m:52s

Port: Gi0/44
------------

Port state    = Up Mstr In-Bndl
Channel group = 1           Mode = Desirable-Sl    Gcchange = 0
Port-channel  = Po1         GC   = 0x00010001      Pseudo port-channel = Po1
Port index    = 0           Load = 0x00            Protocol =   PAgP

Flags:  S - Device is sending Slow hello.  C - Device is in Consistent state.
        A - Device is in Auto mode.        P - Device learns on physical port.
        d - PAgP is down.
Timers: H - Hello timer is running.        Q - Quit timer is running.
        S - Switching timer is running.    I - Interface timer is running.

Local information:
                                Hello    Partner  PAgP     Learning  Group
Port      Flags State   Timers  Interval Count   Priority   Method  Ifindex
Gi0/44    SC    U6/S7   H       30s      1        128        Any      5001

Partner's information:

          Partner              Partner          Partner         Partner Group
Port      Name                 Device ID        Port       Age  Flags   Cap.
Gi0/44    NEWBUILDINGSWITCH    08d0.9fbb.8e80   Gi1/0/43     2s SAC     10001

Age of the port in the current state: 0d:00h:26m:33s

                Port-channels in the group:
                ---------------------------

Port-channel: Po1
------------

Age of the Port-channel   = 6d:04h:01m:18s
Logical slot/port   = 2/1          Number of ports = 2
GC                  = 0x00010001      HotStandBy port = null
Port state          = Port-channel Ag-Inuse
Protocol            =   PAgP
Port security       = Disabled

Ports in the Port-channel:

Index   Load   Port     EC state        No of bits
------+------+------+------------------+-----------
  0     00     Gi0/42   Desirable-Sl       0
  0     00     Gi0/44   Desirable-Sl       0

Time since last port bundled:    0d:00h:26m:40s    Gi0/44
Time since last port Un-bundled: 0d:00h:42m:37s    Gi0/44

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

NEWBUILDINGSWITCH#show etherchannel detail
                Channel-group listing:
                ----------------------

Group: 1
----------
Group state = L2
Ports: 3   Maxports = 8
Port-channels: 1 Max Port-channels = 1
Protocol:   PAgP
Minimum Links: 0
                Ports in the group:
                -------------------
Port: Gi1/0/43
------------

Port state    = Up Mstr In-Bndl
Channel group = 1           Mode = Automatic-Sl    Gcchange = 0
Port-channel  = Po1         GC   = 0x00010001      Pseudo port-channel = Po1
Port index    = 0           Load = 0x00            Protocol =   PAgP

Flags:  S - Device is sending Slow hello.  C - Device is in Consistent state.
        A - Device is in Auto mode.        P - Device learns on physical port.
        d - PAgP is down.
Timers: H - Hello timer is running.        Q - Quit timer is running.
        S - Switching timer is running.    I - Interface timer is running.

Local information:
                                Hello    Partner  PAgP     Learning  Group
Port      Flags State   Timers  Interval Count   Priority   Method  Ifindex
Gi1/0/43  SAC   U6/S7   HQ      30s      1        128        Any      5001

Partner's information:

          Partner              Partner          Partner         Partner Group
Port      Name                 Device ID        Port       Age  Flags   Cap.
Gi1/0/43  CORESWITCH           d057.4c03.3700   Gi0/44      16s SC      10001

Age of the port in the current state: 0d:00h:28m:24s

Port: Gi1/0/44
------------

Port state    = Down Not-in-Bndl
Channel group = 1           Mode = Automatic-Sl    Gcchange = 0
Port-channel  = null        GC   = 0x00000000      Pseudo port-channel = Po1
Port index    = 0           Load = 0x00            Protocol =   PAgP

Flags:  S - Device is sending Slow hello.  C - Device is in Consistent state.
        A - Device is in Auto mode.        P - Device learns on physical port.
        d - PAgP is down.
Timers: H - Hello timer is running.        Q - Quit timer is running.
        S - Switching timer is running.    I - Interface timer is running.

Local information:
                                Hello    Partner  PAgP     Learning  Group
Port      Flags State   Timers  Interval Count   Priority   Method  Ifindex
Gi1/0/44  dA    U1/S1           1s       0        128        Any      0

Age of the port in the current state: 0d:00h:31m:58s

Port: Gi1/0/45
------------

Port state    = Up Mstr In-Bndl
Channel group = 1           Mode = Automatic-Sl    Gcchange = 0
Port-channel  = Po1         GC   = 0x00010001      Pseudo port-channel = Po1
Port index    = 0           Load = 0x00            Protocol =   PAgP

Flags:  S - Device is sending Slow hello.  C - Device is in Consistent state.
        A - Device is in Auto mode.        P - Device learns on physical port.
        d - PAgP is down.
Timers: H - Hello timer is running.        Q - Quit timer is running.
        S - Switching timer is running.    I - Interface timer is running.

Local information:
                                Hello    Partner  PAgP     Learning  Group
Port      Flags State   Timers  Interval Count   Priority   Method  Ifindex
Gi1/0/45  SAC   U6/S7   HQ      30s      1        128        Any      5001

Partner's information:

          Partner              Partner          Partner         Partner Group
Port      Name                 Device ID        Port       Age  Flags   Cap.
Gi1/0/45  CORESWITCH           d057.4c03.3700   Gi0/42      12s SC      10001

Age of the port in the current state: 0d:00h:54m:13s

                Port-channels in the group:
                ---------------------------

Port-channel: Po1
------------

Age of the Port-channel   = 6d:03h:51m:55s
Logical slot/port   = 5/1          Number of ports = 2
GC                  = 0x00010001      HotStandBy port = null
Port state          = Port-channel Ag-Inuse
Protocol            =   PAgP
Port security       = Disabled

Ports in the Port-channel:

Index   Load   Port     EC state        No of bits
------+------+------+------------------+-----------
  0     00     Gi1/0/43 Automatic-Sl       0
  0     00     Gi1/0/45 Automatic-Sl       0

Time since last port bundled:    0d:00h:28m:27s    Gi1/0/43
Time since last port Un-bundled: 0d:00h:44m:24s    Gi1/0/44

Labels:
0 Helpful
9 Replies 9

cadet alain
VIP Alumni
VIP Alumni

‎09-24-2012 12:19 AM

Hi,

Can you post sh run interface x/x on both switches where x/x is the id of the interface which is down in the port-channel.

Regards.

Alain

Don't forget to rate helpful posts.

Don't forget to rate helpful posts.
0 Helpful

chakradhar bolla
Level 1
Level 1
In response to cadet alain

‎09-24-2012 12:25 AM

on core switch

interface GigabitEthernet0/42

description ***NEW BUILDING ETHERCHANNEL***

channel-protocol pagp

channel-group 1 mode desirable

!

interface GigabitEthernet0/43

description ***NEW BUILDING ETHERCHANNEL***

channel-protocol pagp

channel-group 1 mode desirable

!

interface GigabitEthernet0/44

description ***NEW BUILDING ETHERCHANNEL***

channel-protocol pagp

channel-group 1 mode desirable

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

Another switch

interface GigabitEthernet1/0/43

channel-protocol pagp

channel-group 1 mode auto

!

interface GigabitEthernet1/0/44

channel-protocol pagp

channel-group 1 mode auto

!

interface GigabitEthernet1/0/45

channel-protocol pagp

channel-group 1 mode auto

0 Helpful

cadet alain
VIP Alumni
VIP Alumni
In response to chakradhar bolla

‎09-24-2012 12:32 AM

Hi,

post sh interface outputs on both switches.

Regards.

Alain

Don't forget to rate helpful posts.

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0 Helpful

chakradhar bolla
Level 1
Level 1
In response to cadet alain

‎09-24-2012 12:42 AM

CORESWITCH#show int Gi0/42

GigabitEthernet0/42 is up, line protocol is up (connected)

  Hardware is Gigabit Ethernet, address is d057.4c03.372a (bia d057.4c03.372a)

  Description: ***NEW BUILDING ETHERCHANNEL***

  MTU 1500 bytes, BW 100000 Kbit, DLY 100 usec,

     reliability 255/255, txload 213/255, rxload 2/255

  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

  Last input 00:00:12, output 00:00:06, output hang never

  Last clearing of "show interface" counters never

  Input queue: 0/75/0/0 (size/max/drops/flushes); Total output drops: 30751

  Queueing strategy: fifo

  Output queue: 0/40 (size/max)

  5 minute input rate 792000 bits/sec, 377 packets/sec

  5 minute output rate 83532000 bits/sec, 7156 packets/sec

     231271889 packets input, 109221409016 bytes, 0 no buffer

     Received 1089145 broadcasts (487310 multicasts)

     0 runts, 0 giants, 0 throttles

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

     0 watchdog, 487310 multicast, 0 pause input

     0 input packets with dribble condition detected

     115954441 packets output, 120219113665 bytes, 0 underruns

     0 output errors, 0 collisions, 3 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

CORESWITCH#show int Gi0/43

GigabitEthernet0/43 is down, line protocol is down (notconnect)

  Hardware is Gigabit Ethernet, address is d057.4c03.372b (bia d057.4c03.372b)

  Description: ***NEW BUILDING ETHERCHANNEL***

  MTU 1500 bytes, BW 100000 Kbit, DLY 100 usec,

     reliability 251/255, txload 1/255, rxload 1/255

  Encapsulation ARPA, loopback not set

  Keepalive set (10 sec)

  Auto-duplex, Auto-speed, media type is 10/100/1000BaseTX

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

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

  Last input 01:15:10, output 01:15:07, output hang never

  Last clearing of "show interface" counters never

  Input queue: 0/75/0/0 (size/max/drops/flushes); Total output drops: 52242

  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

     82876817 packets input, 22469717382 bytes, 0 no buffer

     Received 548527 broadcasts (341582 multicasts)

     0 runts, 1 giants, 0 throttles

     11948 input errors, 1460 CRC, 0 frame, 0 overrun, 0 ignored

     0 watchdog, 341582 multicast, 0 pause input

     0 input packets with dribble condition detected

     288162823 packets output, 281889715047 bytes, 0 underruns

     0 output errors, 0 collisions, 11 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

CORESWITCH#show int Gi0/44

GigabitEthernet0/44 is up, line protocol is up (connected)

  Hardware is Gigabit Ethernet, address is d057.4c03.372c (bia d057.4c03.372c)

  Description: ***NEW BUILDING ETHERCHANNEL***

  MTU 1500 bytes, BW 100000 Kbit, DLY 100 usec,

     reliability 255/255, txload 13/255, rxload 22/255

  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

  Last input 00:00:04, output 00:00:04, output hang never

  Last clearing of "show interface" counters never

  Input queue: 0/75/0/0 (size/max/drops/flushes); Total output drops: 54904

  Queueing strategy: fifo

  Output queue: 0/40 (size/max)

  5 minute input rate 8637000 bits/sec, 4671 packets/sec

  5 minute output rate 5335000 bits/sec, 1126 packets/sec

     124351618 packets input, 65103069792 bytes, 0 no buffer

     Received 1187100 broadcasts (684254 multicasts)

     0 runts, 0 giants, 0 throttles

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

     0 watchdog, 684254 multicast, 0 pause input

     0 input packets with dribble condition detected

     168776519 packets output, 70512945800 bytes, 0 underruns

     0 output errors, 0 collisions, 11 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

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

NEWBUILDINGSWITCH#show int Gi1/0/43

GigabitEthernet1/0/43 is up, line protocol is up (connected)

  Hardware is Gigabit Ethernet, address is 08d0.9fbb.8eab (bia 08d0.9fbb.8eab)

  MTU 1500 bytes, BW 100000 Kbit, DLY 100 usec,

     reliability 255/255, txload 17/255, rxload 11/255

  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

  Last input 00:00:06, output 00:00:01, output hang never

  Last clearing of "show interface" counters never

  Input queue: 0/75/0/0 (size/max/drops/flushes); Total output drops: 12406

  Queueing strategy: fifo

  Output queue: 0/40 (size/max)

  5 minute input rate 4546000 bits/sec, 976 packets/sec

  5 minute output rate 7049000 bits/sec, 4412 packets/sec

     169723008 packets input, 71567664383 bytes, 0 no buffer

     Received 7883327 broadcasts (3342459 multicasts)

     0 runts, 0 giants, 0 throttles

     2360 input errors, 703 CRC, 0 frame, 0 overrun, 0 ignored

     0 watchdog, 3342459 multicast, 0 pause input

     0 input packets with dribble condition detected

     122746576 packets output, 64942164220 bytes, 0 underruns

     0 output errors, 0 collisions, 3 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

NEWBUILDINGSWITCH#show int Gi1/0/44

GigabitEthernet1/0/44 is down, line protocol is down (notconnect)

  Hardware is Gigabit Ethernet, address is 08d0.9fbb.8eac (bia 08d0.9fbb.8eac)

  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)

  Auto-duplex, Auto-speed, media type is 10/100/1000BaseTX

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

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

  Last input 01:16:38, output 01:16:37, output hang never

  Last clearing of "show interface" counters never

  Input queue: 0/75/0/0 (size/max/drops/flushes); Total output drops: 5638

  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

     287251008 packets input, 280850396126 bytes, 0 no buffer

     Received 6799136 broadcasts (3125060 multicasts)

     0 runts, 0 giants, 0 throttles

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

     0 watchdog, 3125060 multicast, 0 pause input

     0 input packets with dribble condition detected

     84844118 packets output, 22662324029 bytes, 0 underruns

     0 output errors, 0 collisions, 3 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

NEWBUILDINGSWITCH#show int Gi1/0/45

GigabitEthernet1/0/45 is up, line protocol is up (connected)

  Hardware is Gigabit Ethernet, address is 08d0.9fbb.8ead (bia 08d0.9fbb.8ead)

  MTU 1500 bytes, BW 100000 Kbit, DLY 100 usec,

     reliability 255/255, txload 1/255, rxload 205/255

  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

  Last input 00:00:03, output 00:00:07, output hang never

  Last clearing of "show interface" counters never

  Input queue: 0/75/0/0 (size/max/drops/flushes); Total output drops: 21608

  Queueing strategy: fifo

  Output queue: 0/40 (size/max)

  5 minute input rate 80714000 bits/sec, 6888 packets/sec

  5 minute output rate 630000 bits/sec, 322 packets/sec

     116930544 packets input, 121534852805 bytes, 0 no buffer

     Received 5823000 broadcasts (1767161 multicasts)

     0 runts, 0 giants, 0 throttles

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

     0 watchdog, 1767161 multicast, 0 pause input

     0 input packets with dribble condition detected

     231520917 packets output, 109271535472 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

but cable is connected on interface (Cable is working )

0 Helpful

cadet alain
VIP Alumni
VIP Alumni
In response to chakradhar bolla

‎09-24-2012 12:46 AM

Hi,

but cable is connected on interface (Cable is working )

What do you mean by that ?

Regards.

Alain

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0 Helpful

chakradhar bolla
Level 1
Level 1
In response to cadet alain

‎09-24-2012 12:51 AM

GigabitEthernet1/0/44 is down, line protocol is down (notconnect),,network cable is connected on interface,but it showing down.

0 Helpful

cadet alain
VIP Alumni
VIP Alumni
In response to chakradhar bolla

‎09-24-2012 01:08 AM

Have you verified your cable? What if you take this cable and link different interfaces, is it still down/down ?

I suppose it was working before with same cable and same interfaces ?

Regards.

Alain

Don't forget to rate helpful posts.

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0 Helpful

chakradhar bolla
Level 1
Level 1
In response to cadet alain

‎09-24-2012 02:18 AM

Hi,

i was reverted the cables .still that port is down

0 Helpful

chakradhar bolla
Level 1
Level 1
In response to chakradhar bolla

‎10-04-2012 11:14 PM

No issues resolved .Issue with physical cable length.

0 Helpful
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