Global Loadbalancing with DNS

Hi
In the CSS Global load balancing I was going through the description of using the setup desribed, but I am confused about the following statements
"An application session is configured between two CSS switches in two different geographic locations. There is no requirement for a point-to-point link joining the sites; the only requirement is that the two sites can route to each other.
Using the CSS switches DNS capability, a higher level DNS server (in this example, the one authoritative for yourdomain.com) will be configured to use both CSS' circuit VLAN address as NS records for a sub-domain called www.yourdomain.com. Whichever CSS is referred to by the higher level DNS server will then resolve that a record request with the IP address of the DNS content rule on the CSS.
The primary site will be preferred through a combination of using an ACL on the secondary CSS, an application session between the two CSS switches, and configuring the above mentioned NS records on the higher-level DNS server"
Here are we only using the DNS feature of the CSS or another external DNS as well.
The information was obtained from the URL
http://www.cisco.com/en/US/products/hw/contnetw/ps789/products_configuration_example09186a00801dcd75.shtml
Any assistance would be extremely helpfull
Thank you
Regards
Aiyappa

there is always an external DNS due to the protocol nature.
If you have a DNS server for your domain, say cisco.com, you will create an entry on this dns server to point www.cisco.com to the 2 CSS.
When a client does a domain name resolution for www.cisco.com they will first query the .com server, that will redirect the dns request to your server .cisco.com that will redirect the request to www.cisco.com which will be a CSS that can answer the DNS request with the VIP address.
If you don't have a dns server, for your .cisco.com network yet, you can contact the .com authorities and ask them to register one or to register the CSS directly [really not recommended as the CSS is very limited it what it can do with DNS].
So, to answer your question, no an external dns server is not required [you can test this function in a lab without dns server] but in a production environment you will need one.
Regards,
Gilles.

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Message Edited by Tushar Jambhekar on 10-06-2005 07:33 PM
Message Edited by Tushar Jambhekar on 10-06-2005 07:36 PM
Tushar Jambhekar
[email protected]
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Puppa wrote:
I hooked up my E4200v2 with the intention of replacing another router, with DNS off. While everything else was disconnected, I used a wired interface to change its address to 192.168.0.1 on the first setup page. As soon as I pressed "Save Settings", the darned thing turned off all of its ethernet ports and lay dead. I performed a 30on-30off-30on reset, but the darned thing wouldn't wake up. I let it sit for a half hour and tried again, with no luck. I tried again an hour later, and suddenly the Cisco light began to blink. I quickly hooked up my PC to the wired local port, and set my PC's wired interface statically to the new subnet. No luck. Then I tried the original subnet. No luck. Then suddenly the ports went dead again, never to return to life, despite patient waiting followed by another attempt to 30on-30off-30on reset. What gives? Is there some fatal firmware flaw? Has no one out there done this before? This router is only about 4 months old. Is there another reset mode? It's like the settings poisoned it. The Cisco light is on solid, but no recovery.
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