Re: Running Alteon back into another switch

Thanks for letting me know my options.  I was under the impression that 
by having the load balanced servers on a separate vlan on the 6506, I 
was effectively making the traffic have to go back through the Alteon. 
Is this not the case?

On 3/27/2009 6:43 PM, Tony Bourke wrote:
> Hi Alex,
>
> I think the missing piece is one of the fundamentals of load
> balancing: You need to make sure traffic goes through the Alteon on
> the way out.
>
> Traffic for load balanced servers needs to hit the load balancer on
> the way, and on the way out.  Getting traffic to hit the LB on the way
> in is easy; the VIP address.  Getting traffic through the LB on the
> way out, that's a bit trickier, and you have several options.
>
> By plugging servers directly into the Alteon, you were forcing traffic
> through the Alteon on the way out by it being the server's only
> network connection.  Now that you're plugging the servers into the
> 6500, you'll need another method.
>
> If you want to be able to hit the Virtual Service on the Alteon while
> on the same subnet as the servers, you'll have to use proxy IPs
> (warning, this will make it appear to the web servers that all inbound
> web requests come from the Alteon, instead of the true source IP
> address).  By making all requests come from the Proxy IP (PIP) of the
> Alteon, you force traffic through the Alteon on the out.
>
> If you don't have that limitation, i.e. your clients will be on a
> different netblock than the servers, you can use route-path mode by
> setting the default gateway of the servers to the Alteon's floating
> administration IP.  This makes the Alteon the path of traffic on the
> way out, and set the Alteon's default gateway to whatever the server's
> default gateway used to be, so traffic still makes it out to the
> Internet.
>
> So in short, you're options are:  Proxy IP, or route-path (default
> gateway is the Alteon).
>
> Hope that helps, and let me know if you have any questions.
>
> Tony
>
>
>
>
> When you were plugging the servers directly into the Alteon.
>
>
> On Mar 27, 2009, at 3:23 PM, Alex Thurlow wrote:
>
>
>> I have an issue which is somewhat of a general networking question,
>> but
>> there's a load balancer in the middle of it, so I'm asking here.
>>
>> Here's my current setup:
>>
>> A Cisco 6506 has all of my non-load balanced hardware and my uplinks
>> plugged into it.  All general ports  are on VLAN 10
>>
>> 2 bonded Fiber links from the 6506 to an Alteon 184.
>>
>> 3 load balanced machines plugged directly into the Alteon.  All Alteon
>> ports are also VLAN 10
>>
>> All this works.
>>
>> What I want to do is, instead of plugging the load balanced machines
>> directly into the Alteon, I want to run a link from the Alteon back to
>> ports on the 6506 on different VLANs.  Then I can plug as many things
>> behind the load balancer as I want as long as I don't go over the
>> bandwidth supplied by the links to the alteon and back.
>>
>> I've been testing this however, and it's not as easy as it seems
>> like it
>> should be.
>>
>> I set 2 ports on the 6506 to:
>> switchport
>> switchport access vlan 60
>> switchport mode access
>> no cdp enable
>>
>> I plugged port 6 (not doing vlan tagging) on the Alteon into one of
>> the
>> vlan 60 ports on the 6506 and I plugged a test machine into the other
>> vlan 60 port.
>>
>> I set up a real server on in the Alteon with the IP address of the
>> test
>> machine.
>>
>> After all this, the test machine can access the Alteon and any
>> machines
>> connected directly to it, but it can't contact the 6506 or any
>> machines
>> hooked to it.
>>
>> Another note, all machines here are using IP addresses in the same C
>> block, if this matters.  Direct Access Mode on the Alteon is on as
>> well,
>> so things should be able to access its IP directly.
>>
>> Anyone know what I'm missing here?
>>
>> --
>> Alex Thurlow
>> Blastro Networks
>>
>> http://www.blastro.com
>> http://www.roxwel.com
>> http://www.yallwire.com
>>
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>


-- 
Alex Thurlow
Blastro Networks

http://www.blastro.com
http://www.roxwel.com
http://www.yallwire.com

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