[stratum-dev] Is there a limit on the # of ECMP groups stratum_bmv2 can handle?

Maximilian Pudelko max at opennetworking.org
Tue May 11 00:36:16 UTC 2021

Hi Syd,

I have not observed this error before. Stratum-bmv2 is backed by PI (
All P4RT messages are passed to it nearly unmodified, so the issue must lie


On Mon, May 10, 2021 at 1:47 PM A Sydney via stratum-dev <
stratum-dev at lists.stratumproject.org> wrote:

> Hi Stratum folks,
> # Context:
> I have created a pipeline that enables IPv4-ECMP (P4 snippet shown in
> attached file action_selector*) and I am able to build and push p4info.txt
> and bmv2.json to the switches.
> # Issue:
> When I attempt to add groups, the first one moves to the "ADDED" state.
> When I attempt to add a second, the first group and the second both move to
> the "PENDING_ADD_RETRY" state.
> # ONOS logs:
> At the same time, P4RuntimeClientImpl throws the error "Error while
> performing READ on device:spine2...Unexpected error in RPC handling". Then
> ONOS spirals into this cycle of attempting to reinstall all flows on the
> switch (See debug.log for details.).
> # Logs on one of the bmv2 switches:
> I then see the following error on the switch:
> [libprotobuf FATAL
> external/com_google_protobuf/src/google/protobuf/repeated_field.h:1694]
> CHECK failed: (index) < (current_size_):
> # Question:
> Have you ever come across this one?  Are there any obvious mistakes that
> I'm running into (Perhaps my P4 ECMP definition attached is incorrect?)?
> Any suggestions on how to debug further?
> Thanks!
> -Syd
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