This is not about Cisco or Juniper
This is IBM's response to a trend of the server access network edge becoming integrated with the compute platform. This trend is best demonstrated by HP with Virtual Connect. HP has taken much IBM blade server share by integrating networking into the chassis in a way which adds unique, differentiated value compared to third-party switches.
This has become a bigger issue with Cisco releasing UCS, which also provides a compute platform with integrated server access networking and unique differentiation.
BNT makes sense, because BNT already provides products for BladeCenter and iDataPlex and BNT is acquirable.
This will allow IBM to build an integrated blade solution which is more competitive with HP C-Class and Cisco UCS.