Local ARS HLD #5

VladimirKuk · 2024-12-17T09:23:11Z

initial version

amazor · 2024-12-17T11:54:03Z

doc/ARS/Local_ARS_HLD.md

+
+**Existing Forwarding Decision Model**
+
+Today, the routing protocol or SDN controller decides the reachability of a given destination and finds all possible paths. These paths may be equal cost or unequal cost. Decision to choose one of the paths from all available paths is done in the switch pipeline based on a computed hash. This path selection is static in nature based on the packet fields. Hash based selection doesn't take into account the dynamic state of the local or end-to-end path.


The decision to choose of one the paths...

amazor · 2024-12-17T11:55:01Z

doc/ARS/Local_ARS_HLD.md

+
+Today, the routing protocol or SDN controller decides the reachability of a given destination and finds all possible paths. These paths may be equal cost or unequal cost. Decision to choose one of the paths from all available paths is done in the switch pipeline based on a computed hash. This path selection is static in nature based on the packet fields. Hash based selection doesn't take into account the dynamic state of the local or end-to-end path.
+
+Control plane protocols exist for traffic engineering a path but involves a control plane decision that is very slow to react to changing traffic patterns in the network or state of interfaces.


traffic engineering paths, but involves control plane decisions that are very slow...

amazor · 2024-12-17T11:55:17Z

doc/ARS/Local_ARS_HLD.md

+
+Control plane protocols exist for traffic engineering a path but involves a control plane decision that is very slow to react to changing traffic patterns in the network or state of interfaces.
+
+Adaptive Routing System (ARS) allows dynamically selection of the best available path for data packets based on real-time network conditions. This approach helps to mitigate congestion, optimize resource utilization, and improve overall network performance.


allows dynamic selections of the best...

amazor · 2024-12-17T11:56:30Z

doc/ARS/Local_ARS_HLD.md

+
+Adaptive Routing System (ARS) allows dynamically selection of the best available path for data packets based on real-time network conditions. This approach helps to mitigate congestion, optimize resource utilization, and improve overall network performance.
+
+No standard exists, but there are industry consesus for general approach.


is an industry consensus

amazor · 2024-12-17T11:56:56Z

doc/ARS/Local_ARS_HLD.md

+
+No standard exists, but there are industry consesus for general approach.
+
+Following illustrates common operation of ARS, in which two paths are considered - one shortest (minimal) and another (non-minimal), when forwarding trafficto the destination. When shortest path becomes congested, alternative will be used.


The following illustrates the common operation of ARS

traffic to

the alternative

amazor · 2024-12-17T12:25:52Z

doc/ARS/Local_ARS_HLD.md

+arsorch - it is an orchestration agent that handles the configuration requests from CONFIG_DB or APPL_DB. It is responsible for creating the SAI ARS profile and configuring SAI ARS object.
+
+#### Orchdaemon
+orchdaemon - it is the main orchestration agent, which handles all Redis DB's updates, then calls appropriate orchagent, the new arsorch should be registered inside an orchdaemon.


The orchdaemon

amazor · 2024-12-17T12:29:20Z

doc/ARS/Local_ARS_HLD.md

+##### ARS_PORIFLE
+
+```
+	container ARS_PORIFLE {


ARS_PROFILE

amazor · 2024-12-17T12:41:36Z

doc/ARS/Local_ARS_HLD.md

+	container ARS_OBJECT {
+
+		list ARS_OBJECT_LIST {
+			key "profile_name ars_name";


amazor · 2024-12-17T12:46:50Z

doc/ARS/Local_ARS_HLD.md

+##### ACL_RULE changes
+
+```
+	container sonic-acl {


remove all here except for the new leaf

amazor · 2024-12-17T12:47:05Z

doc/ARS/Local_ARS_HLD.md

+						length 1..255;
+					}
+				} 
+...


remove extra "```"

DanielaMurin · 2024-12-22T08:48:08Z

doc/ARS/Local_ARS_HLD.md

+
+| Revision | Date        | Author           | Change Description |
+| -------- | ----------- | ---------------- | ------------------ |
+| 1.0      | Dec 01 2024 | Vladimir Kuk     | Initial proposal   |


Please add Marvell somewhere to the revision.

DanielaMurin · 2024-12-22T08:53:47Z

doc/ARS/Local_ARS_HLD.md

+	}
+```
+
+#### Config DB Enhancements  


Please fix formatting issues in "Config DB Enhancements"

DanielaMurin · 2024-12-22T08:55:33Z

doc/ARS/Local_ARS_HLD.md

+
+### Warmboot and Fastboot Design Impact  
+
+Warmboot for SWSS container will be supported.


If there is no delay or impact on warmboot, that should be mentioned here.

DanielaMurin · 2024-12-22T08:57:04Z

doc/ARS/Local_ARS_HLD.md

+
+### Restrictions/Limitations
+
+Due to hw resources allocations, all ARS configuration must be done prior to routing configuration.???????????


Let's remove the ???????????
If this is an issue, let's move it to the "Open/Action items" section.

Signed-off-by: Vladimir Kuk <[email protected]>

initial HLD version

e1a5928

VladimirKuk requested review from amazor, marvellgit, matiAlfaro, shiraez, aviramd, DanielaMurin, rck-innovium and shaygol December 17, 2024 09:27

amazor reviewed Dec 17, 2024

View reviewed changes

DanielaMurin reviewed Dec 22, 2024

View reviewed changes

VladimirKuk added 3 commits January 2, 2025 10:40

review changes

b7fc309

Signed-off-by: Vladimir Kuk <[email protected]>

Identation fix

df5a17c

Signed-off-by: Vladimir Kuk <[email protected]>

Identation fix

6cb1875

Signed-off-by: Vladimir Kuk <[email protected]>

VladimirKuk requested review from marvellgit and removed request for marvellgit January 5, 2025 08:19

VladimirKuk added 5 commits January 6, 2025 17:27

changes after initial review

5999c60

update fonts

85308e5

intergrated ARS_OBJECT in NHG and LAG, use notification mechanism

c543eac

removed ARS_OBJECT

e1ed0c7

Update to latest changes

e2cf03a

Signed-off-by: Vladimir Kuk <[email protected]>

VladimirKuk requested a review from rminnikanti January 20, 2025 13:24

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Local ARS HLD #5

Local ARS HLD #5

VladimirKuk commented Dec 17, 2024

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		Existing Forwarding Decision Model

		Today, the routing protocol or SDN controller decides the reachability of a given destination and finds all possible paths. These paths may be equal cost or unequal cost. Decision to choose one of the paths from all available paths is done in the switch pipeline based on a computed hash. This path selection is static in nature based on the packet fields. Hash based selection doesn't take into account the dynamic state of the local or end-to-end path.


		Today, the routing protocol or SDN controller decides the reachability of a given destination and finds all possible paths. These paths may be equal cost or unequal cost. Decision to choose one of the paths from all available paths is done in the switch pipeline based on a computed hash. This path selection is static in nature based on the packet fields. Hash based selection doesn't take into account the dynamic state of the local or end-to-end path.

		Control plane protocols exist for traffic engineering a path but involves a control plane decision that is very slow to react to changing traffic patterns in the network or state of interfaces.


		Control plane protocols exist for traffic engineering a path but involves a control plane decision that is very slow to react to changing traffic patterns in the network or state of interfaces.

		Adaptive Routing System (ARS) allows dynamically selection of the best available path for data packets based on real-time network conditions. This approach helps to mitigate congestion, optimize resource utilization, and improve overall network performance.


		Adaptive Routing System (ARS) allows dynamically selection of the best available path for data packets based on real-time network conditions. This approach helps to mitigate congestion, optimize resource utilization, and improve overall network performance.

		No standard exists, but there are industry consesus for general approach.


		No standard exists, but there are industry consesus for general approach.

		Following illustrates common operation of ARS, in which two paths are considered - one shortest (minimal) and another (non-minimal), when forwarding trafficto the destination. When shortest path becomes congested, alternative will be used.


		### Warmboot and Fastboot Design Impact

		Warmboot for SWSS container will be supported.


		### Restrictions/Limitations

		Due to hw resources allocations, all ARS configuration must be done prior to routing configuration.???????????

Local ARS HLD #5

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Local ARS HLD #5

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VladimirKuk commented Dec 17, 2024

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