[j-nsp] Rate selectability on MPC7E-MRATE

[Brian Johnson]

Several points.

1. Configuration examples explaining how something is configured are not supposed to imply that this is how you should configure it or even that the exact configuration is valid. The example configuration could allow for over-subscription if port 5 were added at 100G.

2. The MPC7 card can be RTU licensed to 50% and 75% of the ports. Not following licensing restrictions on port usage will void support.

3. Junos will let you configure all kinds of things that will either not work or break later. It’s a feature. ;)

4. Be sure you fully understand what you are doing before implementing it and checking with Juniper to be sure it is a supported configuration is not a bad idea when there is a cloudy understanding of the features. I work with customers all of the time on the Juniper MX product line and this card is still very misunderstood (even by me occasionally).

My advice would be to validate what you are doing with JTAC before implementing In production.

- Brian

> On May 6, 2020, at 12:47 PM, Tobias Heister <lists at tobias-heister.de> wrote:
> 
> On 06.05.2020 18:24, Brian Johnson wrote:
>> A wise man once told me… “Just because you can do something, doesn’t mean you should”. More specific, “Just because you can do it in the Junos config, doesn’t mean it’s supported.” Junipers licensing “honor system” required honorable intentions. ;)
> 
> I would say it is supported. Even the documentation has an example where one port of the group is 100GE and two others are 10GE:
> https://www.juniper.net/documentation/en_US/junos/topics/topic-map/rate-selectability-configuring.html#id-configuring-rate-selectability-at-port-level
> 
> Also with MPC7 its not like its honor based to only use 240G per PFE ... its a hard limit ;)
> 
> If you run in PIC Mode with 100GE set, than in deed the other ports are disabled:
> "For example, if you choose to configure PIC 0 at 100-Gbps speed, only ports 2 and 5 of PIC 0 operate at 100-Gbps speed, while the other ports of the PIC are disabled."
> https://www.juniper.net/documentation/en_US/junos/topics/topic-map/rate-selectability-configuring.html#id-configuring-rate-selectability-on-mpc7e-multi-rate-to-enable-different-port-speeds
> 
> I mean what else should it do, there are only two 100GE Ports per PFE anyway ;)
> 
> -- 
> Kind Regards
> Tobias Heister
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