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ISR G2/UCSE waas appliance replacement

My customer has existing Waas appliances inline in regional/branch location to a pair of WAN routers.  They are looking at a refresh, and want to know if an ISR with a UCSE blade and vWaas might be a more cost effective approach.  They have a single appliance configured for fail-open, so my question is, can an ISR/UCSE provide the equivalent capability,using a double-wide blade with 2 ethernet ports, or would we either have to go to a one-armed approach, or else use a pair of ISRs in front of the WAN routers?  (Insertion of UCSEbaldes into the WAN routers, or upgrading the WAN routers is not an option at present).

My assumption is that fail-open requires special relay hardware in the NIC, but I wondered if anyone else has faced a similar situation, and what their soluution was.

Thanks

Regards,

Mike Flanigan

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