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Link aggregate on 3750X

Good morning,

I have a 3750X switch, and I have two computers connected to it.  I just setup link aggregation for the two PCs.  They both show 2.0 Gbps for their link status, but when I copy a file from one PC to the other the speed is only 100MBps.  Isn't it supposed to be 200MBps.

Here is some info that might help.

SWITCH(config)#interface range gi1/0/28-33

SWITCH(config-if-range)#channel-group 1 mode on

 

SWITCH(config)#interface range gi1/0/31-32

SWITCH(config-if-range)#chann

SWITCH(config-if-range)#channel-g

SWITCH(config-if-range)#channel-group ?

  <1-48>  Channel group number

  auto    Enable LACP auto on this interface

 

SWITCH(config-if-range)#channel-group 2 ?

  mode  Etherchannel Mode of the interface

 

SWITCH(config-if-range)#channel-group 2 mode ?

  active     Enable LACP unconditionally

  auto       Enable PAgP only if a PAgP device is detected

  desirable  Enable PAgP unconditionally

  on         Enable Etherchannel only

  passive    Enable LACP only if a LACP device is detected

 

SWITCH(config-if-range)#channel-group 2 mode on ?

  <cr>

 

SWITCH(config-if-range)#channel-group 2 mode on

Creating a port-channel interface Port-channel 2

 

SWITCH(config-if-range)#

*Jan 11 05:08:51.070: %LINK-3-UPDOWN: Interface Port-channel2, changed state to up

*Jan 11 05:08:52.077: %LINEPROTO-5-UPDOWN: Line protocol on Interface Port-channel2, changed state to up

 

 

 

SWITCH#show etherchannel summ

Flags:  D - down        P - bundled in port-channel

        I - stand-alone s - suspended

        H - Hot-standby (LACP only)

        R - Layer3      S - Layer2

        U - in use      N - not in use, no aggregation

        f - failed to allocate aggregator

 

        M - not in use, minimum links not met

        m - not in use, port not aggregated due to minimum links not met

        u - unsuitable for bundling

        w - waiting to be aggregated

        d - default port

 

        A - formed by Auto LAG

 

 

Number of channel-groups in use: 2

Number of aggregators:           2

 

Group  Port-channel  Protocol    Ports

------+-------------+-----------+-----------------------------------------------

1      Po1(SU)          -        Gi1/0/28(P) Gi1/0/33(P)

2      Po2(SU)          -        Gi1/0/31(P) Gi1/0/32(P)

 

SWITCH#show etherchannel port-channel

                Channel-group listing:

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

 

Group: 1

----------

                Port-channels in the group:

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

 

Port-channel: Po1

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

 

Age of the Port-channel   = 2d:06h:07m:08s

Logical slot/port   = 10/1          Number of ports = 2

GC                  = 0x00000000      HotStandBy port = null

Port state          = Port-channel Ag-Inuse

Protocol            =    -

Port security       = Disabled

Load share deferral = Disabled

 

Ports in the Port-channel:

 

Index   Load   Port     EC state        No of bits

------+------+------+------------------+-----------

  0     00     Gi1/0/28 On                 0

  0     00     Gi1/0/33 On                 0

 

Time since last port bundled:    0d:08h:18m:37s    Gi1/0/28

Time since last port Un-bundled: 0d:08h:18m:40s    Gi1/0/28

 

Group: 2

----------

                Port-channels in the group:

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

 

Port-channel: Po2

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

 

Age of the Port-channel   = 0d:00h:41m:50s

Logical slot/port   = 10/2          Number of ports = 2

GC                  = 0x00000000      HotStandBy port = null

Port state          = Port-channel Ag-Inuse

Protocol            =    -

Port security       = Disabled

Load share deferral = Disabled

 

Ports in the Port-channel:

 

Index   Load   Port     EC state        No of bits

------+------+------+------------------+-----------

  0     00     Gi1/0/31 On                 0

  0     00     Gi1/0/32 On                 0

 

Time since last port bundled:    0d:00h:25m:06s    Gi1/0/32

Time since last port Un-bundled: 0d:00h:25m:08s    Gi1/0/32

1 Reply 1

Kasun Bandara
VIP Advocate VIP Advocate
VIP Advocate

its depends on load balancing method. check below 

https://www.cisco.com/c/en/us/support/docs/lan-switching/etherchannel/12023-4.html#catalyst

Please rate this and mark as solution/answer, if this resolved your issue
Good luck
KB
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