RSP880 vs RSP880-LT

[Dmitry Kiselev]

Hi!

Could you please point me to document which describes differences between 880 RSPs? TR vs SE are pretty clear, but I confused a bit with LT version. Seems it is newer than TR/SE, but seems it lacks some features/options. Usually BRKARC-2003 answers all such questions, but few last sessions have no any info on that.

Thanks in advance

[nkarpysh]

Hello,

You can find details here:

https://www.cisco.com/c/en/us/products/collateral/routers/asr-9000-series-aggregation-services-routers/datasheet-c78-733763.html

https://www.cisco.com/c/dam/en/us/products/se/2017/8/Collateral/asr-9K-rsp880-it.pptx

HTH

Niko

[Dmitry Kiselev]

Thanks for prompt answer!

I read datasheet already. Anything else except CPU (# of cores and freq) and SSD size?
LT is $10K GPL cheaper for TR and around $20K for SE version. I feel that something else may hiding beyond such price difference. Am I wrong?

[nkarpysh]

Have you checked the ppt as well?

Niko

[Dmitry Kiselev]

Sorry, I forgot to add: my CCO account have insufficient permissions to access that file.

[nkarpysh]

RSP880LT is supported on 9910 and 9906 chassis in comparison to RSP880, has slightly faster RIB learning rate.

Though it is not supporting nV-Cluster and 3rd party applications.

That is the primary difference (not mentioning core/SSD again).

Niko

[hhofst]

Do you know if a RSP880-SE would be able to run in a ASR9906 chassis?

[Aleksandar Vidakovic]

RSP880-LT-TR and RSP880-LT-SE can be used in ASR9906 and ASR9910, but the regular RSP880-TR and/or RSP880-SE cannot. ASR9906 and ASR9910 have a mid-plane that connects the 2x RSP and 5x SFCs. The regular RSP880 doesn't have the required backplane connectors because it was designed at the time when asr9906 and asr9910 concept wasn't available yet. RSP880-LT was designed later, that's why it's compatible with ASR9906, ASR9910.

[hhofst]

Thx a lot for your answer!!!

[edsge teenstra]

I have a hard time finding the minimum amount of required A99-SFC-T modules inside a ASR-9906 chassis in combination with two A99-RSP880-LT route processors. 

Can the chassis run with only two RSP880-LT's (that have a switch fabric also) but not a single SFC module in the 5 SFC slot? 

[Aleksandar Vidakovic]

It depends on the line cards that you want to use. In an ASR9906 or ASR9910 chassis an RSP880-LT provides around 230Gbps of fabric throughput. If you use for example only MOD200 line cards in the chassis, two RSP880-LT cards will already provide for sufficient fabric throughput and fabric redundancy. If you use MOD400 or similar, you can run with two RSP880-LT, but you'll have no fabric redundancy. If you want to use 8x100G cards, you need at least two SFCs, three if you want fabric N+1 redundancy.

hope this helps...

/Aleksandar

[edsge teenstra]

Great thanks, that is what I expected but could not confirm. Have a great day! 

[James Jun]

From my understanding, RSP880-LT seems more like reboot of the RSP440 line.  Differences are as follows:

- 880-LT has only 230G per slot fabric, so you won't get 450G/slot like on 880-TR/SE if you are running this on classic ASR9006/9010.  This is not a problem for ASR9910 and ASR9906, as RSPs on these devices are 230G/slot regardless (you use SFC-S/SFC-T cards to reach 1T+/slot capacity throughout the chassis on 9906/9910; built-in fabric for RSP is only 230G).

- 880-LT lacks the nv-edge sfp+ sync ports (removed because whole nV feature-set got recently EOL'd).

- 880-LT goes back to quad-core Intel CPU with higher per-core clock speed like on RSP440, as opposed to octo-core 1.8Ghz on 880-TR/SE. 

For 9906/9910 chassis, I'm not sure what rationale difference there is between RSP-T/S and RSP880-LT.  Built-in fabric is same regardless of RSP type, so the only difference is CPU... and... the lack of fancy red lights on where nvEdge ports used to be -- may be for that reason alone, I'll stick to RSP-S/T and not use the LT.  ;-D gotta have the red lights, hah.

[nkarpysh]

Thanks JAmes,

One correction: RSP880-LT provides 230G bandwidth only for 9906 and 9910 chassis which is as per LC BW.

9904, 9010, 9006 are getting 440 per RSP with TSP880-LT, so  there are no restriction here in comparison to RSP880.

Niko

[Dmitry Kiselev]

Thanks to all for help!