ASR 9001 does not support STM-16 interfaces. It is purely 1 GE/10 GE platform.
If you are looking for an XR platform that supports STM-16 interfaces, you need to go with the 9006 (or 9904) , RSP-440, SIP-700 and POS SPA (for STM) and Typhoon 10GE linecard. (with Trident you might face an issue for the number of learned prefixes depending on the scale profile you choose: http://www.cisco.com/c/en/us/support/docs/routers/asr-9000-series-aggregation-services-routers/116999-problem-line-card-00.html)
If you decide to go with the ASR 1006, make sure you choose dual RP2 ( with 16GB mem), ESP-100 (or ESP-200) and SIP40. This should eliminate the TCAM exhaustion issue, if you decide to do NAT and ACL.; and guarantee and route-scale that might occur. (for the ASR 1000, I would recommend upgrading all of the memories)
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loadbalancing is one of the more complex items in hardware forwarding. of course we have talked about it many years on cisco live (id 2904) with ever incrementing more detail. and there is the support forum article on loadbalancing.
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