[c-nsp] IOS SLB support

[Frank Bulk - iNAME]

It looks like IOS SLB support for the RSP720's made it into the SRC code
line:
http://www.cisco.com/en/US/docs/ios/ipapp/configuration/guide/ipapp_slb.html

We just upgraded to SRB4 a month ago on TAC's advice to see if it resolves
an intermittent (once every few months) critical bug.  If we can upgrade to
SRC and save ourselves $10K+ in redundant load balancers (traffic rates
would be 2-4 Mbps), I would like to do that, but if SRC is generally "too
new", then perhaps I need to reconsider.

My initial design calls for two servers, each with two virtual machines.
The first VM on the first server would be running the same services as the
first VM on the second server.  I would like each VM to communicate both
directly to the other 3 VMs and also to the SLB.  Based on my research, it
looks like I need to run dispatch mode, but not only that, put each the VM
on a server on different networks.  Do I need to set up a trunk to the
virtual server host, and break out there, or can I just assign a secondary
network to each VLAN?

               _____ A-1
              /      A-2
hosts---7609-S
              \_____ B-1
                     B-2
   
A-1 and B-1 mirror each other, and so do A-2 and B-2.  A-1 and B-1 need to
be able to talk to the virtual IP that balances between to A-2 and B-2, and
the hosts need to talk to the virtual IP that balances A-1 and B-1 and the
other virtual IP that balances A-2 and B-2.  

Frank     

-----Original Message-----
From: Arie Vayner (avayner) [mailto:avayner at cisco.com] 
Sent: Wednesday, October 17, 2007 2:46 AM
To: Asbjorn Hojmark - Lists; frnkblk at iname.com
Cc: cisco-nsp at puck.nether.net
Subject: RE: [c-nsp] IOS SLB support

Asbjorn,

>From what I know it is planned for the next SR release (SRC).

Arie

-----Original Message-----
From: cisco-nsp-bounces at puck.nether.net
[mailto:cisco-nsp-bounces at puck.nether.net] On Behalf Of Asbjorn Hojmark
- Lists
Sent: Monday, October 15, 2007 23:32 PM
To: frnkblk at iname.com
Cc: cisco-nsp at puck.nether.net
Subject: Re: [c-nsp] IOS SLB support

> I'm running c7600rsp72043-advipservicesk9-mz.122-33.SRB1 on a 7609-S
> with the RSP720 and PFC3C.  Any idea when I'll see SLB support?

It is my understanding that there will never be IOS SLB on the RSP720.
Have you been told otherwise? It sure isn't supported today, re.
http://tinyurl.com/2f4mqc.

> And is SLB without Cisco's Content Services module truly switch in
> software, or does the PFC3C now deal with that in hardware?

The CSM works it's magic using network processors on the module, but
it's still configured from IOS, close to the same config as with IOS
SLB. However, the CSMs are not supported in 12.2 SR.

A later release should add RSP720 support for the ACE, which also works
on network processors (though much faster than the CSM), but is
configured from a separate (IOS-like) command line.

-A

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