ASR9000 Architecture

Question

Hi,
i have the following questions regarding ASR9000 family architecture:
1- as per Cisco documentation and presentations, ASR9922 has 1.2Tbps peer slot (bidirectional), meaning that the full chassis has 48Tbps. so how can this capacity acheived if each line card is connected to each fabric line with 110Gbps links, so each  line card has 770Gbps to the fabric, so the total device capacity should be 770Gbps * 20 = 15.4 Tbps (bidirectional)
2- As per Cisco presentations, ASR9000 and ASR9900 AC power supplies configuration is N+N and DC power supply is N+1, does that mean that the chassis can only tolerate one DC power supply failure and half of the AC power supplies??
3- how can the ASR9904 chassis achieve 770Gbps/per slot, where the RSP440 used and the 2n generation line cards used are the same used on ASR9010 and ASR9006 which can only provide 440Gbps/slot, does that mean that the limitation is on the chassis of ASR9010 and ASR9006, and the RSP440 and 2nd generation line cards can support 770Gbps/slot?
4- as per cisco presentation, it says that the multicast traffic is passing through a different plane other than the unicast traffic, does that mean that the multicast traffic is passing through other fabric chips (sacramento) which are on the RSP 440?
5- for multicast traffic on ASR9K series, what is the difference between MGID on line cards and FGID on the fabric?

Answer 1

Hello,
1.
I recommend taking a look at this document
http://www.cisco.com/c/en/us/support/docs/routers/asr-9000-series-aggregation-services-routers/117718-technote-asr9000-00.html
The 1.2Tbps is the chassis limit, as newer LCs and FCs come out we will be able to utilize more of the potential bandwidth.
2.
For power supplies you need N power modules to power all the HW in a particular router.
What if a single power supply fails? In order to prevent the system from shutting down a card due to lack of power its recommended to implement N+1 power supplies
What if your A or B feed fails?
For DC you have two power connectors to each power supply so you can connect both feeds, so if feed A goes out feed B can handle the load and therefore N+1 is okay for DC.
For AC you can only use a single feed, therefore is feed A goes all power supplies connected to feed A will no longer work. So for feed-level protection you need N+N protection.
3.
Correct, the 9904 has an enhanced backplane and a higher theoretical limit than the 9010 or 9006 which have been out for considerably longer.
4.
I am not sure where the term plane comes in effect here, can you share a link to the presentation that shows this? Unicast and multicast packets all go through the same ASICs but we have different queues for these traffic types.
5.
The MGID and FGID you should never need to worry about, these are calculated automatically.
HTH,
Sam