LiteLLM / LiteLLM

LiteLLM Proxy Multi-Replica TPM Limit Enforcement Bug — Effective Limit Multiplied by Replica Count

Fix LiteLLM proxy TPM limit not being enforced correctly across multiple replicas in production deployments Includes evidence for LiteLLM troubleshooting demand.

Source-backed Last updated May 13, 2026 1 source Needs local verification

Category: LiteLLM
Error signature: tpm_limit × N_replica — TPM enforcement per-pod instead of cross-pod in multi-replica deployments
Quick fix: Check the build output, project root, and deployment platform configuration before redeploying.
Updated: May 13, 2026
Verification status: Source-backed
Evidence: 1 public source URL

Before you change production

This page includes public source URLs in the imported troubleshooting record. Compare those references with your version and environment before applying changes.

Reproduce the smallest failing action and save non-secret logs before changing configuration.
Check versions for LiteLLM, related SDKs, package managers, CI runners, and hosting providers.
Change one setting or dependency at a time, then rerun the same failing command or request.
Avoid destructive commands, credential rotation, billing changes, or security relaxations without a rollback plan.

What this error means

tpm_limit × N_replica — TPM enforcement per-pod instead of cross-pod in multi-replica deployments is a LiteLLM failure pattern reported for developers trying to fix litellm proxy tpm limit not being enforced correctly across multiple replicas in production deployments. Based on the imported evidence, treat this as a tool-specific troubleshooting page rather than a generic API error.

Why this happens

LiteLLM issue #27736 documents a production bug: 5-replica deployment with tpm_limit=1,500,000 observed 40-minute window where effective throughput was 7,500,000 tokens (5x configured). Root cause: TPM keys are not batch-synced across replicas via Redis (unlike RPM keys), so each replica enforces limits against its local in-memory counter only.

Common causes

In multi-replica LiteLLM proxy deployments with usage-based-routing-v2, the deployment-level TPM limit is enforced per-replica instead of cross-replica. The effective limit becomes tpm_limit × N_replica, allowing up to 5x the intended throughput (in a 5-replica setup) without any 429 responses. This breaks cost control and quota management for teams running LiteLLM in production.
LiteLLM issue #27736 documents a production bug: 5-replica deployment with tpm_limit=1,500,000 observed 40-minute window where effective throughput was 7,500,000 tokens (5x configured). Root cause: TPM keys are not batch-synced across replicas via Redis (unlike RPM keys), so each replica enforces limits against its local in-memory counter only.

Quick fixes

Confirm the exact error signature matches tpm_limit × N_replica — TPM enforcement per-pod instead of cross-pod in multi-replica deployments.
Check the LiteLLM account, local tool state, and provider configuration involved in the failing workflow.
Check the build output, project root, and deployment platform configuration before redeploying.

Platform/tool-specific checks

Verify the command, editor, extension, or API client that produced the error.
Compare local settings with CI, deployment, or editor-level settings when the error appears in only one environment.
Avoid deleting credentials, local model data, or project settings until the failing scope is clear.

Step-by-step troubleshooting

Capture the exact error message and the command, editor action, or request that triggered it.
Check whether the failure is account/auth, quota/rate, model/provider, local runtime, or deployment configuration.
Review the source evidence below and compare it with your environment.
Apply one change at a time and rerun the smallest failing action.
Keep the working fix documented for the team or deployment environment.

How to prevent it

Keep provider/tool configuration documented.
Record non-secret diagnostics such as tool version, provider name, model name, and command path.
Add a lightweight check before CI or production workflows depend on the tool.

Diagnostic flow for this page

Match tpm_limit × N_replica — TPM enforcement per-pod instead of cross-pod in multi-replica deployments exactly before applying the quick fix.
Compare the failing environment with LiteLLM versions, account scope, provider settings, and deployment context.
Check the listed common causes in order, starting with the cause that best matches your logs.
Use the evidence status below to decide whether to confirm against public sources or official documentation.
Apply one reversible change, rerun the smallest failing action, and keep rollback notes.

FAQ

What does tpm_limit × N_replica — TPM enforcement per-pod instead of cross-pod in multi-replica deployments mean in LiteLLM?

tpm_limit × N_replica — TPM enforcement per-pod instead of cross-pod in multi-replica deployments indicates the workflow described by "LiteLLM Proxy Multi-Replica TPM Limit Enforcement Bug — Effective Limit Multiplied by Replica Count" failed in a LiteLLM context. Start by confirming the exact signature and the component that emitted it.

What should I check first for tpm_limit × N_replica — TPM enforcement per-pod instead of cross-pod in multi-replica deployments?

Check whether this cause matches your environment: In multi-replica LiteLLM proxy deployments with usage-based-routing-v2, the deployment-level TPM limit is enforced per-replica instead of cross-replica. The effective limit becomes tpm_limit × N_replica, allowing up to 5x the intended throughput (in a 5-replica setup) without any 429 responses. This breaks cost control and quota management for teams running LiteLLM in production.

Is the tpm_limit × N_replica — TPM enforcement per-pod instead of cross-pod in multi-replica deployments guidance source-backed?

The "LiteLLM Proxy Multi-Replica TPM Limit Enforcement Bug — Effective Limit Multiplied by Replica Count" page is labeled source-backed. It has 1 public source URL from github.com, so use that evidence status when deciding how much additional verification you need.

When should I avoid the quick fix for tpm_limit × N_replica — TPM enforcement per-pod instead of cross-pod in multi-replica deployments?

For "LiteLLM Proxy Multi-Replica TPM Limit Enforcement Bug — Effective Limit Multiplied by Replica Count", avoid applying "Check the build output, project root, and deployment platform configuration before redeploying." when the error text differs, the affected version or provider is different, or the change would touch credentials, billing, DNS, production deploy settings, or irreversible data.

What should I collect before debugging tpm_limit × N_replica — TPM enforcement per-pod instead of cross-pod in multi-replica deployments?

For "LiteLLM Proxy Multi-Replica TPM Limit Enforcement Bug — Effective Limit Multiplied by Replica Count", collect the failing LiteLLM command or request, non-secret configuration, versions, timestamps, request IDs when available, and the smallest reproduction that still triggers the signature.