SRX

Is it possible to dynamically allocate bandwidth from a 100Mb circuit, where ge-0/0/1 gets  a maximum of 20 and ge-0/0/2 gets a minimum of 80, but then whatever isn't utilized on ge-0/0/1 gets allocated to ge-0/0/2? 

that'll be on ge-0/0/0

So I've got a 100m cct coming in ge-0/0/0 and I need to dynamically allocate 20/80 out to ge-0/0/1 & 2 - whereby ge-0/0/2 gets at least 80M (but can also be allocated whatever part of the 20m ge-0/0/1 isn't using)

if that makes sense!

Hello,

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@smitmail42 wrote:

So I've got a 100m cct coming in ge-0/0/0 and I need to dynamically allocate 20/80 out to ge-0/0/1 & 2 - whereby ge-0/0/2 gets at least 80M (but can also be allocated whatever part of the 20m ge-0/0/1 isn't using)

if that makes sense!

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Think of it this way: 100Mbps coming into ge-0/0/0 has already arrived, You cannot do anything about it.

Now, think of what composition this traffic has:

- if all of it (100%) needs to go out of ge-0/0/1, then put a 20M output policer/shaper on ge-0/0/1, then ge-0/0/1 will get 20%. ge-0/0/2 will get nothing but there was nothing towards ge-0/0/2 in the 1st place

- if 50% of ge-0/0/0-received traffic needs to go out of ge-0/0/1 and another 50% of it needs to go out of ge-0/0/2, then the same ge-0/0/1 output policer/shaper will rate-limit down to 20Mbps which is Your goal as stated above, and ge-0/0/2 will get 50Mbps as offered to it.

- if 10% of ge-0/0/0-received traffic needs to go out of ge-0/0/1 and 90% out of ge-0/0/2, then 20Mbps output policer/shaper on ge-0/0/1 will not get triggered. ge-0/0/2 will receive full 90Mbps which meets Your goal "ge-0/0/2 must be allocated whatever ge-0/0/1 isn't using" - ge-0/0/1 "will not use" 10Mbps out of "allocated" 20.

- if 0% of ge-0/0/0-received traffic needs to go out of ge-0/0/1 and 100% out of ge-0/0/2, then 20Mbps output policer/shaper on ge-0/0/1 will not get triggered. ge-0/0/2 will receive full 100Mbps which meets Your goal "ge-0/0/2 must be allocated whatever ge-0/0/1 isn't using" - ge-0/0/1 "will not use" 20Mbps out of "allocated" 20.

All-in-all, simple 20Mbps output policer/shaper on ge-0/0/1 will do what You asked.

If Your ask is actually not what You have in mind, then this is another story 

HTH

Thx

Alex

 Do you wanna devide that 100M to 80 and 20, for traffic going out to internet or traffic coming to SRX from internet?

It's a good question Suraj, I think I'd only really thought about 80/20 for traffic coming in, I was advised by a customer to split the bandwidth 80/20, with a max 20 going one way and min 80 going the other - tbh they didn't mention shaping it for traffic going out, so I hadn't really thought about it but I suppose I need to ask the question. Thanks for the responses guys.

Yea I obviously didn't  think through how a 20Mb shaper on ge-0/0/1 would work, that's exactly  what I need, thanks

Hi Alex, 

So in this scenario if I put a  20Mbps output policer/shaper on ge-0/0/1 - would that mean that ge-0/0/2 would be able to saturate the 100Mbps? 

Chris

Hello,

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@smitmail42 wrote:

Hi Alex, 

So in this scenario if I put a  20Mbps output policer/shaper on ge-0/0/1 - would that mean that ge-0/0/2 would be able to saturate the 100Mbps? 

 

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Your ask was to limit the 100Mbps offered traffic coming FROM ge-0/0/0 differently, depending on where traffic is going - out of ge-0/0/1 or out of ge-0/0/2

If You are concerned about ge-0/0/2 being able to send >100Mbps TO ge-0/0/0, then this is opposite direction and a different requirement.

In this case, You need to enable CoS with schedulers and priorities.

HTH

Thx

Alex