CSS state sync questions

[david.lung]

I learned from cisco doc that the CSS stat are exchanged in real time.

" For new flows, CSSs exchange flow states in real time over the ISC links. For existing flows, CSSs exchange flow states at boot-up time and at VIP redundancy failover.

I"

http://www.cisco.com/en/US/partner/products/hw/contnetw/ps792/products_configuration_guide_chapter09186a00801ef2a1.html

Does this mean that once a "flow" is created in a primary box, the state information will be replicated to the backup one? Are there any delay in the state replication? Is there any routine state database sync in addition to the real time replication?

[Gilles Dufour]

as mentioned in the doc, when the flow is created on the active box, the flow info is immediately forwarded to the standby device.

Full database synchronisation will only occurs after failover of one of the two devices.

Regards,

Gilles.

[david.lung]

Hi Gilles,

Would you please explain the meaning of "Full database synchronisation will only occurs after failover of one of the two devices" , if one device is fail , how to replicate.

Regards,

David Lung

[Gilles Dufour]

obviously when one device is down, you can't replicate anything with it.

However, once it comes back up, it has no information

about the currently active flows.

So a full synch will occur.

Gilles.