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Posted by News Reader on April 18, 2008, 9:52 am
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>> Trendkill wrote:
>>> On Apr 17, 6:55 pm, cconnel...@lycos.com wrote:
>>>> Hello
>>>> I configured lacp between a cisco switch and a nortel load balancer.
>>>> Could someone tell me what "default" port means in the cisco output
>>>> below, and what the effect of this is, i read somewhere its the port
>> "The default port is used to transmit traffic, such as Spanning Tree
>> Protocol (STP), multicasts, and unknown unicasts. The default port can
>> be identified from the output of the command show etherchannel summary
>> by a notation of d."
>>
>> more:http://www.cisco.com/application/pdf/paws/12023/4.pdf
>>
>>
>>
>>
>>
>>>> where multicast traffic is sent on, i cant find it in any books. I
>>>> noticed if i change "system priority higer on my switch than the
>>>> nortel the default port changes to 4, i cant work out why.
>>>> Thanks for any help
>>>> Switch#sh etherchannel summary
>>>> Flags: D - down P - in port-channel
>>>> I - stand-alone s - suspended
>>>> H - Hot-standby (LACP only)
>>>> R - Layer3 S - Layer2
>>>> u - unsuitable for bundling
>>>> U - in use f - failed to allocate aggregator
>>>> d - default port
>>>> Number of channel-groups in use: 1
>>>> Number of aggregators: 1
>>>> Group Port-channel Protocol Ports
>>>> ------+-------------+-----------
>>>> +-----------------------------------------------
>>>> 3 Po3(SU) LACP Fa0/3(Pd) Fa0/4(P)
>>> If I had to guess, the switch is not going to send the same frame to
>>> both ports, else there is no point of an etherchannel (it could then
>>> only go at the speed of a single port). Therefore, one port has to be
>>> the first port which traffic is sent, at which time its alternated or
>>> goes to the second port at a certain utilization. I would guess that
>>> has something to do with default port...but again...just guessing.
>>> Would need to read up on cisco.com.
>> Best Regards,
>> News Reader- Hide quoted text -
>>
>> - Show quoted text -
>
> Thats good to know. One thing I have noticed is that the default port
> can change sometimes from 3-4 (if i reset the switch or change the
> config) but mostly stays on 3, not sure if this matters. The nortel
> side refers to this default port on the cisco as "attached
> aggreagator" Im not sure what this means though - any ideas?
> thx
No, my contribution was limited to finding you some literature ;>) ,
since you stated "i cant find it in any books".
Other posters will have more familiarity with this subject than moi.
Best Regards,
News Reader
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