SMLT link to server with Intel NIC's.

SMLT link to server with Intel NIC's.
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Subject Author Date
SMLT link to server with Intel NIC's. Jan Hugo Prins 05-31-2006
Posted by Jan Hugo Prins on May 31, 2006, 6:24 pm
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Hello,

I want to connect a server with an SMLT link to 2 8600 switches. If I do
this, is it correct that the server has 2 x 1Gb uplink and downlink
available? How should I configure the Network Team on the server? Is
Static Link Aggregation OK? The connection to any host is only 1Gb right?
Or is there a possibility to make the bandwidtch to any host on the
network that is also connected with SMLT to exceed the 1Gb limit, or
better, can I have 2 Gb of bandwidth between 2 servers both connected with
an SMLT link to the same pair of 8600 switches?

Thanks a lot.
Jan Hugo Prins


Posted by Dophi on June 1, 2006, 1:00 pm
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The server connected to Passport 8600 with SMLT will have 2Gb banwidth
in theory. I suggest you use Static LACP to link with SMLT of Passport
8600. After routing or swtiching, there is only 1Gb bandwith for client
if it is connected directly to Passport 8600 by using a giga port.

> Jan Hugo Prins wrote:
> Hello,
>
> I want to connect a server with an SMLT link to 2 8600 switches. If I do
> this, is it correct that the server has 2 x 1Gb uplink and downlink
> available? How should I configure the Network Team on the server? Is
> Static Link Aggregation OK? The connection to any host is only 1Gb right?
> Or is there a possibility to make the bandwidtch to any host on the
> network that is also connected with SMLT to exceed the 1Gb limit, or
> better, can I have 2 Gb of bandwidth between 2 servers both connected with
> an SMLT link to the same pair of 8600 switches?
>
> Thanks a lot.
> Jan Hugo Prins


Posted by Jan Hugo Prins on June 1, 2006, 4:29 pm
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On Thu, 01 Jun 2006 10:00:22 -0700, Dophi wrote:

> The server connected to Passport 8600 with SMLT will have 2Gb banwidth
> in theory. I suggest you use Static LACP to link with SMLT of Passport
> 8600. After routing or swtiching, there is only 1Gb bandwith for client if
> it is connected directly to Passport 8600 by using a giga port.

But if I have 2 servers, both connected with a SMLT to 2 8600 switches.
Will I then have 1 Gb between those 2 servers or 2 Gb?

Jan Hugo Prins

Posted by Dophi on June 1, 2006, 11:58 pm
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SMLT only provides a Layer 2 redundency. Two links connnected to
Passport 8600 can provide Layer 2 load sharing for inbound and outbound
traffic if you have a lot of traffic from different clients to
different servers. But, becasue the source and destination MAC
addresses of two servers are fixed in a Layer 2 switching network, the
traffic probably always only pass through one link; which means, there
is probably only 1Gb bandwidth.



Jan Hugo Prins wrote:
> On Thu, 01 Jun 2006 10:00:22 -0700, Dophi wrote:
>
> > The server connected to Passport 8600 with SMLT will have 2Gb banwidth
> > in theory. I suggest you use Static LACP to link with SMLT of Passport
> > 8600. After routing or swtiching, there is only 1Gb bandwith for client if
> > it is connected directly to Passport 8600 by using a giga port.
>
> But if I have 2 servers, both connected with a SMLT to 2 8600 switches.
> Will I then have 1 Gb between those 2 servers or 2 Gb?
>
> Jan Hugo Prins


Posted by lou on June 2, 2006, 4:31 am
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is this what you're trying to do?

svr ---------- [sw1]
\ ||
\ ||
-------- [sw2]

the 8600s will forward traffic to server based on the hashing
algorithm. to say that SMLT only provides a layer2 redundancy is not
quite correct. both links are active at all times.
so, theorytically, yes, 2Gbps is there when the two links are up.
just make sure you have VRRP enabled in both aggregation switches. this
virtual IP is going to be the default g/w for the servers for routed
traffic.

good luck.

Dophi wrote:
> SMLT only provides a Layer 2 redundency. Two links connnected to
> Passport 8600 can provide Layer 2 load sharing for inbound and outbound
> traffic if you have a lot of traffic from different clients to
> different servers. But, becasue the source and destination MAC
> addresses of two servers are fixed in a Layer 2 switching network, the
> traffic probably always only pass through one link; which means, there
> is probably only 1Gb bandwidth.
>
>
>
> Jan Hugo Prins wrote:
> > On Thu, 01 Jun 2006 10:00:22 -0700, Dophi wrote:
> >
> > > The server connected to Passport 8600 with SMLT will have 2Gb banwidth
> > > in theory. I suggest you use Static LACP to link with SMLT of Passport
> > > 8600. After routing or swtiching, there is only 1Gb bandwith for client if
> > > it is connected directly to Passport 8600 by using a giga port.
> >
> > But if I have 2 servers, both connected with a SMLT to 2 8600 switches.
> > Will I then have 1 Gb between those 2 servers or 2 Gb?
> >
> > Jan Hugo Prins


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