Link agg of 3 Gig Interfaces (Cables)

[dathan]

Hi All,

I would like to know whether is it possible to link aggregate 3 Gig Interfaces. I know it might be possible but then how the traffic wil be shared with the 3 cables. I know that in Cisco, if we use 3 cables to aggregate, only 2cables will be used and one will be unusable. Is it the same for Alcatel?

Also if i am using 6850 stack of 4 switches, what could be the best approch for link aggregation? one cable to each switch of the stack or every cable to the primary switch of the stack.

Please advice.

Thanks and Regard
Dathan

[one6f]

Hi Dathan,

number of links per group supported 2, 4 or 8 (per switch or a stack of switches):
lacp linkagg <LAG> size <SIZE>
where <LAG> for stack: 0-31; <SIZE>:2, 4, 8.

The traffic through an aggregated link would be shared across the available physical links (for load balancing purposes).
One flow (i.e. one pair of Source IP Address ; Destination IP Address) will always use the same port in the group.
It is recommended (not needed) to use a group of ports running at the same operational speed.
Ports belonging to one LAG can be located on any device or module (i.e. aggregation is supported across devices and across stack configurations with multiple 6850 modules).
For redundancy, if one module go down, you need to use LAG through the stack modules (one cable to each switch of the stack).

[dathan]

Hi one6f,

Thanks a lot for your advice. Appreciate it.

Thanks & Regards
Dathan

[superkikim]

Hi,

This is sort of helpful. But a part is missing. You just tell how to create LACP agg, but not how to add ports in it... And that's the hard part. I can't find how it works. Can you please help ?

I have so far created two LACPs:

lacp linkagg 1 size 1 name vnxespb admin state enable
lacp linkagg 1 size 2 name vnxespb admin state enable

Then I want to agg ports 1/7 and 1/8 together in linkagg 1, and 1/17 1/18 to linkagg 2. How the hell do I do that ?

Note that this is my first experience with alcatel switchs. And please don't tell me to look at the CLI ref guide. I already have it and I couldn't find the way.

[superkikim]

For instance, I finally found the way, but not tested yet:

Code: Select all

lacp linkagg 1 size 2 name “xyz” admin state enable
lacp linkagg 2 size 2 name “abc” admin state enable

lacp linkagg 1 actor admin key 1
lacp linkagg 2 actor admin key 2

lacp agg 1/7 actor admin key 1
lacp agg 1/8 actor admin key 1
lacp agg 1/17 actor admin key 2
lacp agg 1/18 actor admin key 2

[silvio]

yes, this does work.
The agg (=port) will allocated to the linkagg with same admin key.
regards Silvio