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From: cconnell_1 on 17 Apr 2008 18:55
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
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)
From: Trendkill on 17 Apr 2008 19:30
On Apr 17, 6:55 pm, cconnel...(a)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
> 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.
From: News Reader on 17 Apr 2008 19:48
Trendkill wrote:
> On Apr 17, 6:55 pm, cconnel...(a)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
From: cconnell_1 on 17 Apr 2008 21:13
On 18 Apr, 00:48, News Reader <u...(a)domain.null> wrote:
> Trendkill wrote:
> > On Apr 17, 6:55 pm, cconnel...(a)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
From: News Reader on 18 Apr 2008 09:52
cconnell_1(a)lycos.com wrote:
> On 18 Apr, 00:48, News Reader <u...(a)domain.null> wrote:
>> Trendkill wrote:
>>> On Apr 17, 6:55 pm, cconnel...(a)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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