Mailing List Archive: Juniper MX204 allow oversubscription?

Juniper MX204 allow oversubscription?

athompson at merlin

May 16, 2022, 10:02 AM

Post #1 of 7 (356 views)

Hi all,
Hoping some Juniper-using folks know:
On the MX204, which comes with 4x100G + 8x10G ports, you can only use 3 of the 4 100G ports if you want to use any of the 10G ports at all.
Supposedly this is to prevent oversubscription on what is a 400G-rated router. However, I’m perfectly fine with oversubscription with a 400G aggregate throughput cap.
Is there a way to stop the automatic “oh, I’ll disable these other ports for you so you don’t oversubscribe the box” behaviour and let all the front-panel ports be used at once?
-Adam

Adam Thompson
Consultant, Infrastructure Services
[MERLIN]
100 - 135 Innovation Drive
Winnipeg, MB R3T 6A8
(204) 977-6824 or 1-800-430-6404 (MB only)
https://www.merlin.mb.ca<https://www.merlin.mb.ca/>
[cid:image002.png@01D8691C.50B29030]Chat with me on Teams<https://teams.microsoft.com/l/chat/0/0?users=athompson@merlin.mb.ca>

Re: Juniper MX204 allow oversubscription? [ In reply to ]

kshymkiw at gmail

May 16, 2022, 10:10 AM

Post #2 of 7 (356 views)

Adam,

Simply put - No there isn't a way to oversubscribe the front panel.

Juniper has a handy tool to check your port combinations though -
https://apps.juniper.net/home/port-checker/index.html

The lack of being able to oversubscribe has to do with # of lanes to the EA
ASIC, and how those can be broken down.

Kevin

On Mon, May 16, 2022 at 11:04 AM Adam Thompson <athompson@merlin.mb.ca>
wrote:

> Hi all,
>
> Hoping some Juniper-using folks know:
>
> On the MX204, which comes with 4x100G + 8x10G ports, you can only use 3 of
> the 4 100G ports if you want to use any of the 10G ports at all.
>
> Supposedly this is to prevent oversubscription on what is a 400G-rated
> router. However, I’m perfectly fine with oversubscription with a 400G
> aggregate throughput cap.
>
> Is there a way to stop the automatic “oh, I’ll disable these other ports
> for you so you don’t oversubscribe the box” behaviour and let all the
> front-panel ports be used at once?
>
> -Adam
>
>
>
> *Adam Thompson*
>
> Consultant, Infrastructure Services
>
> [image: MERLIN]
>
> 100 - 135 Innovation Drive
>
> Winnipeg, MB R3T 6A8
>
> (204) 977-6824 or 1-800-430-6404 (MB only)
>
> https://www.merlin.mb.ca
>
> Chat with me on Teams
> <https://teams.microsoft.com/l/chat/0/0?users=athompson@merlin.mb.ca>
>
>
>

Re: Juniper MX204 allow oversubscription? [ In reply to ]

rcarpen at network1

May 16, 2022, 10:50 AM

Post #3 of 7 (356 views)

If additional ports are more important than the full 100G throughput, you can configure it as 2x100+2x40+8x10.

We tend to break out 10G ports on switches, so we can more fully utilize the 100G ports.

My hope for a successor (MX205 ?) would be more flexibility and 25G ports. 4x100G+8x25G would be awesome.

thanks,
-Randy

--
Randy Carpenter
Vice President - IT Services
First Network Group, Inc.
(800)578-6381, Opt. 1
http://www.network1.net

----- On May 16, 2022, at 1:10 PM, Kevin Shymkiw kshymkiw@gmail.com wrote:

> Adam,

> Simply put - No there isn't a way to oversubscribe the front panel.

> Juniper has a handy tool to check your port combinations though - [
> https://apps.juniper.net/home/port-checker/index.html |
> https://apps.juniper.net/home/port-checker/index.html ]

> The lack of being able to oversubscribe has to do with # of lanes to the EA
> ASIC, and how those can be broken down.

> Kevin

> On Mon, May 16, 2022 at 11:04 AM Adam Thompson < [ mailto:athompson@merlin.mb.ca
> | athompson@merlin.mb.ca ] > wrote:

>> Hi all,

>> Hoping some Juniper-using folks know:

>> On the MX204, which comes with 4x100G + 8x10G ports, you can only use 3 of the 4
>> 100G ports if you want to use any of the 10G ports at all.

>> Supposedly this is to prevent oversubscription on what is a 400G-rated router.
>> However, I’m perfectly fine with oversubscription with a 400G aggregate
>> throughput cap.

>> Is there a way to stop the automatic “oh, I’ll disable these other ports for you
>> so you don’t oversubscribe the box” behaviour and let all the front-panel ports
>> be used at once?

>> -Adam

>> Adam Thompson

>> Consultant, Infrastructure Services

>> 100 - 135 Innovation Drive

>> Winnipeg, MB R3T 6A8

>> (204) 977-6824 or 1-800-430-6404 (MB only)

>> [ https://www.merlin.mb.ca/ | https://www.merlin.mb.ca ]

>> [ https://teams.microsoft.com/l/chat/0/0?users=athompson@merlin.mb.ca | Chat
>> with me on Teams ]

Re: Juniper MX204 allow oversubscription? [ In reply to ]

May 16, 2022, 11:06 AM

Post #4 of 7 (356 views)

On Mon, 16 May 2022 at 18:52, Randy Carpenter <rcarpen@network1.net> wrote:

> My hope for a successor (MX205 ?) would be more flexibility and 25G ports.
> 4x100G+8x25G would be awesome.
>
>
I was hoping the MX304 would be the upgrade, but it seems like overkill -
2U, modular with dual processors, up to 96 x 10/25 GbE, 48 x 40/50/100, 12
x 400 GbE

Probably a bit more expensive than MX204 too.

There's also ACX7100-48L: 48x 10GE/25GE/50GE (SFP56), 6x 400GE (QSFP56-DD)

Aled

Re: Juniper MX204 allow oversubscription? [ In reply to ]

May 16, 2022, 11:12 AM

Post #5 of 7 (356 views)

On 5/16/22 20:06, Aled Morris via NANOG wrote:

>
>
> I was hoping the MX304 would be the upgrade, but it seems like
> overkill - 2U, modular with dual processors, up to 96 x 10/25 GbE, 48
> x 40/50/100, 12 x 400 GbE
>
> Probably a bit more expensive than MX204 too.
>
> There's also ACX7100-48L: 48x 10GE/25GE/50GE (SFP56), 6x 400GE (QSFP56-DD)

The ACX71000 is Broadcom.

Mark.

Re: Juniper MX204 allow oversubscription? [ In reply to ]

rcarpen at network1

May 16, 2022, 11:27 AM

Post #6 of 7 (356 views)

----- On May 16, 2022, at 2:06 PM, Aled Morris aled.w.morris@googlemail.com wrote:

> On Mon, 16 May 2022 at 18:52, Randy Carpenter < [ mailto:rcarpen@network1.net |
> rcarpen@network1.net ] > wrote:

>> My hope for a successor (MX205 ?) would be more flexibility and 25G ports.
>> 4x100G+8x25G would be awesome.

> I was hoping the MX304 would be the upgrade, but it seems like overkill - 2U,
> modular with dual processors, up to 96 x 10/25 GbE, 48 x 40/50/100, 12 x 400
> GbE
> Probably a bit more expensive than MX204 too.

Yes... the MX304 is awesome, but the price is going to be crazy. Possibly ~10x MX204 if fully loaded.

> There's also ACX7100-48L: 48x 10GE/25GE/50GE (SFP56), 6x 400GE (QSFP56-DD)

What does the ACX7100 have in terms of FIB/RIB ? Juniper is making it very hard as of late to find that information. I'd be curious if the ACX could do brder router duties with multiple full BGP feeds (which the MX204 has no problem with at all)

-Randy

Re: Juniper MX204 allow oversubscription? [ In reply to ]

May 16, 2022, 10:18 PM

Post #7 of 7 (355 views)

On 5/16/22 20:27, Randy Carpenter wrote:

> Yes... the MX304 is awesome, but the price is going to be crazy. Possibly ~10x MX204 if fully loaded.

For me, the MX304 should, really, be an alternative to the MX10003, and
not an upgrade of the MX204.

Far easier to get more MX204's than even one MX304 :-).

> What does the ACX7100 have in terms of FIB/RIB ? Juniper is making it very hard as of late to find that information. I'd be curious if the ACX could do brder router duties with multiple full BGP feeds (which the MX204 has no problem with at all)

The ACX7100 is an x86-based system with 32GB of RAM. It ships with a
Broadcom J2 chip. Aggregate capacity is 4.8Tbps. FIB is 1 - 2 million
entries.

There is a bunch of timing in the box, so you can guess whom it's aimed at.

Mark.