On Mar 7, 2007, at 8:39 PM, Iwan Rahabok wrote:
hello world,
I'm designing an infrastructure that is be able to support very
high network traffic between 2 machines, which must be connected
via switches. 2 switches are required (likely Cicso 2960, but open
to others) for active-active.
The traffic is bi-directional. So X4600 will send & receive via
both switches to X4200, and vice versa. So it has to handle inbound
and outbound traffic.
The connectivity is shown below. Dual line means dual physical
ethernet cables.
|------- Switch A -------|
| |
| |
X4600 === ===
X4200 | |
| |
|------- Switch B -------|
Kindly advice:
1. Is it possible to combine/aggregate the 2 ports as active-
active? Specifically, if we send 1 MB file, will it go thru both?
2. When a link fails in the middle of sending, will the fail-over
be transparent?
Looking at Solaris 10 11/06 manuals, the command to use is dladm
(1M). Page 142 states the following:
You cannot use link aggregation in this case, since you are using two
separate switches. As per IEEE 802.3ad, an aggregation connects two
end-points. Some switch vendors implement their own extensions which
allows a single "logical" aggregation to span multiple switches, but
these solutions are not yet common and don't always explicitly
support 802.3ad.
Nicolas.
If you plan to use a link aggregation, consider defining a policy
for outgoing traffic. This policy
specifies how you want packets to be distributed across the
available links of an aggregation, thus
establishing load balancing. The following are the possible layer
specifiers and their significance for
the aggregation policy:
L2 - Determines the outgoing link by hashing theMAC(L2) header of
each packet
L3 - Determines the outgoing link by hashing the IP (L3) header
of each packet
L4 - Determines the outgoing link by hashing the TCP, UDP, or
other ULP (L4) header of each packet
Any combination of these policies is also valid.
Based on the above, will the hashing result in constant route
(always Switch A or Switch B, but never load balance)?
thank you from Singapore
e1
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Nicolas Droux - Solaris Networking - Sun Microsystems, Inc.
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