NHG with Unequal Cost Members#2302
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| * @flags CREATE_AND_SET | ||
| * @default false | ||
| */ | ||
| SAI_NEXT_HOP_GROUP_ATTR_MEMBERS_WITH_UNEQUAL_WEIGHTS, |
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@JaiOCP, what is the additional benefit of querying this capability?
If NOS is configured to program unequal paths, NOS can directly add those members to the NHG with the required weights, right? I believe we don't need any additional hardware capability/support to handle unequal-cost paths in this case.
Please let me know if I am missing any specific use case where this capability is required.
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For the legacy implementation, yes.
For newer implementation where there is a dedicated resource for weight NHG vs unweighted NHG, we need to differentiate the NHG during NHG create.
Now you can make an argument that why not a new NHG type instead of a bool. Problem with that approach is that NHG may be of any type with members as wieghted or unweighted. Hence the introduction of a new bool attribute.
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There is a case where NHG need to allocated differently for ECMP and UCMP for highly optimized fabrics.This PR addresses that case.On Jun 22, 2026, at 8:26 PM, sathk-marvell ***@***.***> wrote:
@sathk-marvell commented on this pull request.
In inc/sainexthopgroup.h:
@@ -359,6 +359,19 @@ typedef enum _sai_next_hop_group_attr_t
*/
SAI_NEXT_HOP_GROUP_ATTR_ADMIN_ROLE,
+ /**
+ * @brief This attribute indicates the nexthop group members weights
+ *
+ * NOS must query this attribute for the support.
+ * False: All members are with equal cost
+ * True: Members are configured with unequal cost
+ *
+ * @type bool
+ * @flags CREATE_AND_SET
+ * @default false
+ */
+ SAI_NEXT_HOP_GROUP_ATTR_MEMBERS_WITH_UNEQUAL_WEIGHTS,
@JaiOCP, what is the additional benefit of querying this capability?
If NOS is configured to program unequal paths, NOS can directly add those members to the NHG with the required weights, right? I believe we don't need any additional hardware capability/support to handle unequal-cost paths in this case.
Please let me know if I am missing any specific use case where this capability is required.
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Signed-off-by: JaiOCP <jai.kumar@broadcom.com> NHG with UECMP Signed-off-by: JaiOCP <jai.kumar@broadcom.com>
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/azp run |
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Azure Pipelines successfully started running 1 pipeline(s). |
3 participants
This PR brings in support for high performant fabric where NHG is created with prior information about the members with weights.
NOS can use sai_query_attribute_capability() to find out if the platform supports such behavior or not. Legacy implementation will always return the status as not supported attribute.