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safe harbor for IOS XR? recommended version for ASR9000?

Hi,

Now working in a new deployment of some ASR9010 at the edge (PE) of an SP network. Questions arise trying to choose the XR software version, Appreciate if anyone can help sharing experiences, and answering few questions.

Is there a safe harbor program for IOS XR software versions?

4.2.0 is the newest available version since 21-dec-2011, but does not have smus yet.

In the other side:

4.1.2 with release date 28-nov-2011 also has not SMUS available to download

4.1.1 with release date 29-jul-2011 has many SMUS available to download.

According to what is available today, what experts recommend? to choose the experienced one = 4.1.1? as seems it is proved one and stable with discovered and available patchs?

Any good or bad experience with this version in the asr9k placed at the edge (PE) of an SP with tipical features and protocols (ospf, mpbgp, ldp, multicast pim ssm, atom)?

Thanks,

Carlos Trujillo.

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