etherchannels, cisco to forigate 4x1gb portchannels, only two joining in.

Answered Question
Mar 27th, 2010
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Hello,


Has anyone experience this.. I have a Cisco 6513 with 4x1gb interfaces going to a Fortigate firewall.  We have added all interfaces to channel-group 256.


However a "show etherchannel 256 detail" shows a etherchannel 256 and 256A?????




If I look at the interfaces in 256A, they show packets output, but not input.   The interfaces in channel-group 256 show both input and output.  Clearly something is amiss here.  Why would it create a channel-group 256A?? and why would there be packets input and not output on this channel-group.. See the output of a "show etherchannel 256 detail" below:





BDR41#sho etherchannel 256 detail   
Group state = L2
Ports: 4   Maxports = 16
Port-channels: 2 Max Port-channels = 16
Protocol:   LACP
Minimum Links: 0
                Ports in the group:
                -------------------
Port: Gi1/9/48
------------


Port state    = Up Mstr In-Bndl
Channel group = 256         Mode = Active      Gcchange = -
Port-channel  = Po256A      GC   =   -         Pseudo port-channel = Po256
Port index    = 0           Load = 0xFF        Protocol =   LACP


Flags:  S - Device is sending Slow LACPDUs   F - Device is sending fast LACPDUs.
        A - Device is in active mode.        P - Device is in passive mode.


Local information:
                            LACP port     Admin     Oper    Port        Port
Port      Flags   State     Priority      Key       Key     Number      State
Gi1/9/48  SA      bndl      32768         0x100     0x100   0x1931      0x3D


Partner's information:


          Partner Partner   LACP Partner  Partner   Partner  Partner     Partner
Port      Flags   State     Port Priority Admin Key Oper Key Port Number Port State
Gi1/9/48  SA      bndl      255           0x0       0x11     0x1         0x3D


Age of the port in the current state: 0d:00h:32m:00s


Port: Gi1/10/48
------------


Port state    = Up Mstr In-Bndl
Channel group = 256         Mode = Active      Gcchange = -
Port-channel  = Po256       GC   =   -         Pseudo port-channel = Po256
Port index    = 1           Load = 0xFF        Protocol =   LACP


Flags:  S - Device is sending Slow LACPDUs   F - Device is sending fast LACPDUs.
        A - Device is in active mode.        P - Device is in passive mode.


Local information:
                            LACP port     Admin     Oper    Port        Port
Port      Flags   State     Priority      Key       Key     Number      State
Gi1/10/48 SA      bndl      32768         0x100     0x100   0x1A31      0x3D


Partner's information:


          Partner Partner   LACP Partner  Partner   Partner  Partner     Partner
Port      Flags   State     Port Priority Admin Key Oper Key Port Number Port State
Gi1/10/48 SA      bndl      255           0x0       0x11     0x1         0x3D


Age of the port in the current state: 6d:20h:31m:24s


Port: Gi2/9/48
------------


Port state    = Up Mstr In-Bndl
Channel group = 256         Mode = Active      Gcchange = -
Port-channel  = Po256A      GC   =   -         Pseudo port-channel = Po256
Port index    = 1           Load = 0xFF        Protocol =   LACP


Flags:  S - Device is sending Slow LACPDUs   F - Device is sending fast LACPDUs.
        A - Device is in active mode.        P - Device is in passive mode.


Local information:
                            LACP port     Admin     Oper    Port        Port
Port      Flags   State     Priority      Key       Key     Number      State
Gi2/9/48  SA      bndl      32768         0x100     0x100   0x2931      0x3D


Partner's information:


          Partner Partner   LACP Partner  Partner   Partner  Partner     Partner
Port      Flags   State     Port Priority Admin Key Oper Key Port Number Port State
Gi2/9/48  SA      bndl      255           0x0       0x11     0x2         0x3D 
         
Age of the port in the current state: 0d:00h:25m:54s


Port: Gi2/10/48
------------


Port state    = Up Mstr In-Bndl
Channel group = 256         Mode = Active      Gcchange = -
Port-channel  = Po256       GC   =   -         Pseudo port-channel = Po256
Port index    = 0           Load = 0xFF        Protocol =   LACP


Flags:  S - Device is sending Slow LACPDUs   F - Device is sending fast LACPDUs.
        A - Device is in active mode.        P - Device is in passive mode.


Local information:
                            LACP port     Admin     Oper    Port        Port
Port      Flags   State     Priority      Key       Key     Number      State
Gi2/10/48 SA      bndl      32768         0x100     0x100   0x2A31      0x3D


Partner's information:


          Partner Partner   LACP Partner  Partner   Partner  Partner     Partner
Port      Flags   State     Port Priority Admin Key Oper Key Port Number Port State
Gi2/10/48 SA      bndl      255           0x0       0x11     0x2         0x3D


Age of the port in the current state: 6d:21h:11m:23s


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


Port-channel: Po256    (Primary Aggregator)


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


Age of the Port-channel   = 6d:21h:16m:11s
Logical slot/port   = 46/43          Number of ports = 2
HotStandBy port = null
Port state          = Port-channel Ag-Inuse
Protocol            =   LACP
Fast-switchover     = disabled
Load share deferral = disabled 


Ports in the Port-channel:


Index   Load      Port          EC state       No of bits
------+------+------------+------------------+-----------
1      FF      Gi1/10/48             Active   8
0      FF      Gi2/10/48             Active   8


Time since last port bundled:    6d:20h:31m:25s    Gi1/10/48
Time since last port Un-bundled: 6d:20h:41m:26s    Gi1/10/48


Port-channel: Po256A
------------


Age of the Port-channel   = 0d:00h:32m:03s
Logical slot/port   = 46/46          Number of ports = 2
HotStandBy port = null
Port state          = Port-channel Ag-Inuse
Protocol            =   LACP
Fast-switchover     = disabled
Load share deferral = disabled 


Ports in the Port-channel:


Index   Load      Port          EC state       No of bits
------+------+------------+------------------+-----------
0      FF       Gi1/9/48             Active   8
1      FF       Gi2/9/48             Active   8


Time since last port bundled:    0d:00h:25m:56s    Gi2/9/48


Last applied Hash Distribution Algorithm: Fixed


BDR41#

Correct Answer by glen.grant about 7 years 1 month ago

  Try  shutting down the port channel SVI , this will shutdown all ports in the channel group Then do a no shut which will bring all back up at the same time. If you tried adding them 1 at a time a lot of times it won't come up correctly .

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Correct Answer
glen.grant Sun, 03/28/2010 - 08:26
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  Try  shutting down the port channel SVI , this will shutdown all ports in the channel group Then do a no shut which will bring all back up at the same time. If you tried adding them 1 at a time a lot of times it won't come up correctly .

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