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Wednesday, March 30, 2011

How to read load distribution between GE links?

Qsolved Question: we are using a 6509 with L2 etherchannel configured. could someone enlighten us- how to read load distribution between GE links. is there a way to express this in percentage?

6500#show etherchannel port-channel
Channel-group listing:
-----------------------

Group: 2
----------
Port-channels in the group:
----------------------

Port-channel: Po2
------------

Age of the Port-channel = 1025d:04h:08m:47s
Logical slot/port = 14/1 Number of ports = 1
GC = 0x00000000 HotStandBy port = null
Port state = Port-channel Ag-Inuse
Protocol = -

Ports in the Port-channel:

Index Load Port EC state No of bits
------+------+------+------------------+-----------
0 FF Gi3/1 On 8

Time since last port bundled: 647d:21h:46m:49s Gi4/16
Time since last port Un-bundled: 641d:06h:08m:39s Gi4/16

Group: 3
----------
Port-channels in the group:
----------------------

Port-channel: Po3
------------

Age of the Port-channel = 1025d:04h:08m:47s
Logical slot/port = 14/2 Number of ports = 2
GC = 0x00000000 HotStandBy port = null
Port state = Port-channel Ag-Inuse
Protocol = -

Ports in the Port-channel:

Index Load Port EC state No of bits
------+------+------+------------------+-----------
0 55 Gi3/16 On 4
1 AA Gi4/1 On 4

Time since last port bundled: 208d:00h:01m:40s Gi4/1
Time since last port Un-bundled: 208d:00h:17m:15s Gi4/1

Group: 4
----------
Port-channels in the group:
----------------------

Port-channel: Po4
------------

Age of the Port-channel = 1025d:04h:08m:48s
Logical slot/port = 14/3 Number of ports = 2
GC = 0x00000000 HotStandBy port = null
Port state = Port-channel Ag-Inuse
Protocol = -

Ports in the Port-channel:

Index Load Port EC state No of bits
------+------+------+------------------+-----------
1 55 Gi3/4 On 4
0 AA Gi3/5 On 4

Time since last port bundled: 184d:12h:17m:09s Gi3/5
Time since last port Un-bundled: 184d:12h:23m:04s Gi3/5

Qsolved Answer:

As naive as it may seem, I would simply have a look at the input/output counters in the show interfaces command output (see the counters for the appropriate physical interfaces that are bundled in an EtherChannel). I am not sure if there is any command that would directly show you the percentage of traffic distribution over an EtherChannel bundle but I guess the counters in show interfaces will provide you with the basic data to compute the ratios yourself.

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