The way you take a WAAS device out of service depends on the interception method you are using. For inline interception, you can shutdown the InlineGroup to put the interface in bypass operating mode. For WCCP interception, you can disable WCCP on the WAAS device with the config mode command no wccp version 2. Once you have completed the upgrade, you simply do the opposite (no shut the InlineGroup or re-enable WCCP) to bring the device back in service.
Remember to upgrade the Central Manager first, prior to upgrading any of the devices running as accelerators.
-> Is there any way that I can check as to which service is in use " inline interception or WCCP "
Under the Device Info in the Central Manager the Interception Method is listed.
-> While going down will be there any service disruption ?
For optimized connections, yes. When you put an InlineGroup into bypass operating mode, it stops intercepting traffic for optimization. Existing optimized connections will be reset.. WCCP does a better job of graceful shutdown. If there are optimized connections established, WCCP will start a timer and check at the expiration of that timer to see if the number of connections has decreased. If it has, the timer is reset, and the check is performed again when the timer expires. This continues until the number of connections is no longer decreasing, at which points the WCCP services are terminated and the remaining connections are reset.
-> Finally , Is there any changes that has to be made on " core switch " to which the WAAS is connected ?
WCCP should be disabled on the devices running as "accelerators", not the Central Manager. Once WCCP has unregistered on the device, the router/switch that the WAAS device was running WCCP with wil forward traffic normally (as if WCCP was not enabled).
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