packet spray in NS3

Richard

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Jun 23, 2024, 11:14:55 PM6/23/24

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Dear all,

I would like to know how can I enable packet spray routing in NS3?

Config::SetDefault ("ns3::Ipv4GlobalRouting::RandomEcmpRouting",BooleanValue(true));

The wiki told me "Set to true if packets are randomly routed among ECMP; set to false for using only one route consistentl". Does it equal to packet spray? Or all packets of the flow will stick to one route, which is chosen randomly (which is not packet spray)?

Best,

Richard

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Jun 23, 2024, 11:26:10 PM6/23/24

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I looked into the code, I think the RandomEcmpRouting is random packet spray, while FlowEcmpRouting is per-flow ECMP. Am I correct?

Tommaso Pecorella

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Jun 26, 2024, 11:17:18 AM6/26/24

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First things first: one has to define "packet spray routing".

Please define it, and/or send a link to the standard using it. Thanks

Michele Zhu

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Jul 11, 2025, 9:12:17 AMJul 11

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Dear Tommaso, I also have the same question in mind.

I'm working with a datacenter network, and we consider per-flow routing.

Packet spraying: The packets are spread equally across the shortest paths between the source and the destination.

Equal-Cost-Multi-Path (ECMP): The packets belonging to a flow are routed along one of the shortest paths.

I did some visualization with NetAnim and believe that PacketSpraying is RandomEcmpRouting, but I'm not completely sure about it. Can you confirm my assumption?

Michele Zhu

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Jul 11, 2025, 9:17:28 AMJul 11

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p.s. In datacenter ECMP the flow selection is performed by a hashing of the IP packet

Tommaso Pecorella

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Aug 30, 2025, 7:57:39 AMAug 30

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From the look of it, yes.

압둘하미드이드리스

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Aug 30, 2025, 4:07:38 PMAug 30

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Good Morning from Korea,

I was trying to implement a Winner II B1 model (3GPP) in my Qlearning algorithm, but got some challenges.

Can anyone help as am using ns3.45?

On Saturday, August 30, 2025, Tommaso Pecorella <tomm...@gmail.com> wrote:

From the look of it, yes.

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Michele Zhu

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Sep 19, 2025, 10:59:28 AMSep 19

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I can confirm. Btw, anyone looking for switch nodes implementation can be found from Vasmi's work/prior research here: https://github.com/inet-tub/ns3-datacenter?tab=readme-ov-file. There is also datacenter ECMP.

Il giorno sabato 30 agosto 2025 alle 22:07:38 UTC+2 압둘하미드이드리스 ha scritto:

Good Morning from Korea,

I was trying to implement a Winner II B1 model (3GPP) in my Qlearning algorithm, but got some challenges.
Can anyone help as am using ns3.45?

On Saturday, August 30, 2025, Tommaso Pecorella <tomm...@gmail.com> wrote:
From the look of it, yes.

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