Bonding and pocket loss

[Tétényi István]

Robin Mordasiewicz wrote:
Dear Robin,

Thank you for your advice! The difference is that in our case switch1 
and switch2 are the internal Dell PowerConnect 5316M ethernet
switches of the PowerEdge 1850.

I have checked  the PowerConnect is having the latest firmware 
code(1.0.0.33), as well as the the Blade (A04).

Kind regards,
  Istvan

> On Tue, 23 May 2006, linux-poweredge at lists.us.dell.com wrote:
>
>> Thomas_Chenault at dell.com wrote:
>> Dear Thomas,
>>
>>> Bonding mode 0 (balance-rr) generally requires that all member 
>>> interfaces are connected to the same Ethernet switch and that the 
>>> connected switch ports are configured for link aggregation 
>>> (etherchannel or similar). Has the switch been configured to match 
>>> the bond?
>>>
>> Thanks for your answer. The brief answer is: no.
>>
>> Each of the ethernet interfaces connected to one of the switches.
>>    blade 1  ethernet 0  is connected to  switch1  /  ethernet 1  is
>> connected to  switch2
>>    blade 2  ethernet 0  is connected to  switch1  /  ethernet 1  is
>> connected to  switch2
>>     ......
>>
>> Switch1 and switch 2 are interconnected with 3*1GE.  I know I have to
>> check the spanning tree settings on the switches.
>> Let us assume it is enabled for each of the ethernet interfaces towards
>> the blades.
>>
>> Is there any bonding mode that can cope with our arrangement?
>>
>> The original idea is/was that if any of the internal blade switch fails
>> the services  still can provided.
>>
>
> we have bonding working like this across switches. The keyt is that 
> your switches must be in a "forced", not negotiated aggregation mode.
> The key is "channel-group 13 mode on"
>
> an example on a cisco 3750 as follows.
>
> ie.
> interface Port-channel13
>  switchport trunk encapsulation dot1q
>  switchport trunk allowed vlan 802
>  switchport mode trunk
> !
> interface GigabitEthernet2/0/7
>  switchport trunk encapsulation dot1q
>  switchport trunk allowed vlan 802
>  switchport mode trunk
>  channel-group 13 mode on
> !
> interface GigabitEthernet4/0/7
>  switchport trunk encapsulation dot1q
>  switchport trunk allowed vlan 802
>  switchport mode trunk
>  channel-group 13 mode on
> !
>
>
>