07-21-2008 11:47 PM
We are running GSLB between two sites.Configured CSS11503 as dns-server zone 1 and dns-server zone 2.The application require site stickiness to the same site until it completes the transaction.
We decided to use DNS stickiness without GSDB
Can some confirm how the CSS responds to client queries and which DNS-A record it will respond with
dns-server
dns-server Zone1
test.zone1.xyz.com 1.1.1.1 10 single kal-icmp 1.1.1.1 100 sticky-enabled
dns-server Zone2
dns-server
test.zone1.xyz.com 2.1.1.1 10 single kal-icmp 2.1.1.1 100 sticky-enabled
Can we confiure the CSS such that it always give the DNS A-record confiured at Zone1 for all the clients
and incase of failure the CSS handsover the DNS A-recored at Zone2.
Thanks in Advance
07-25-2008 01:51 PM
Hi,
The config below should get you going:
dns-server
dns-server Zone1 tier1 "site1" weightedrr
test.zone1.xyz.com 1.1.1.1 10 single kal-icmp 1.1.1.1 100 sticky-enabled
dns-server Zone2 tier1 "site2" weightedrr
dns-server
test.zone1.xyz.com 2.1.1.1 10 single kal-icmp 2.1.1.1 100 sticky-enabled 0
notice that the zone was modified to use the weighted round robin algorithm. also, the site 2 record has a weight of "0" so it only will get requests when site 1 is down.
note: I am presuming you already have the app session configured. the GSLB configuration guide covers the app session as well as other GSLB configuraiton aspects. It is located at: http://www.cisco.com/en/US/docs/app_ntwk_services/data_center_app_services/css11500series/v8.20_v8.10/configuration/gslb/guide/gslbgd.html
hope that helps
-Steve
07-25-2008 08:37 PM
Hi Steve,
Thanks for the reply.
Is there way to confiure the DNS-Balaning method as weightdrr on the specific dns-record instead of the the dns-server zone ?
I guess this will effect the existing dns-records configured as round-robin which is default.
please advice me on this
07-28-2008 08:48 AM
Yes, you can have leave the zone as the default method (round robin) and configure the balance method of weighted round robin in the record. Any balance configured in the record will supercede the zone balance method. The record configuration would then look like:
dns-server
dns-server Zone1 tier1 "site1"
dns-record a test.zone1.xyz.com 1.1.1.1 10 single kal-icmp 1.1.1.1 100 sticky-enabled weightedrr
dns-server Zone2 tier1 "site2"
dns-server
dns-record a weightedrrtest.zone1.xyz.com 2.1.1.1 10 single kal-icmp 2.1.1.1 100 sticky-enabled weightedrr 0
hope that helps
-Steve
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