diff --git a/.azure-pipelines/Dockerfile.sai-vpp-overlay b/.azure-pipelines/Dockerfile.sai-vpp-overlay
new file mode 100644
index 00000000..ea9dd8a9
--- /dev/null
+++ b/.azure-pipelines/Dockerfile.sai-vpp-overlay
@@ -0,0 +1,21 @@
+ARG BASE_IMAGE=docker-sai-test-vpp:base
+FROM ${BASE_IMAGE}
+
+COPY debs /tmp/vpp-debs
+
+RUN set -eux; \
+    cp /usr/sbin/sysctl /usr/sbin/sysctl.real; \
+    cp /usr/bin/true /usr/sbin/sysctl; \
+    apt-get update; \
+    apt-get install -y --reinstall --allow-downgrades --no-install-recommends \
+        /tmp/vpp-debs/*.deb; \
+    mv /usr/sbin/sysctl.real /usr/sbin/sysctl; \
+    for deb in /tmp/vpp-debs/*.deb; do \
+        package="$(dpkg-deb -f "$deb" Package)"; \
+        expected_version="$(dpkg-deb -f "$deb" Version)"; \
+        installed_version="$(dpkg-query -W -f='${Version}' "$package")"; \
+        test "$installed_version" = "$expected_version"; \
+        dpkg --verify "$package"; \
+    done; \
+    apt-get clean; \
+    rm -rf /tmp/vpp-debs /var/lib/apt/lists/*
\ No newline at end of file
diff --git a/.azure-pipelines/build-sai-vpp-test-image-template.yml b/.azure-pipelines/build-sai-vpp-test-image-template.yml
new file mode 100644
index 00000000..89298d7b
--- /dev/null
+++ b/.azure-pipelines/build-sai-vpp-test-image-template.yml
@@ -0,0 +1,209 @@
+parameters:
+- name: timeout
+  type: number
+  default: 60
+
+- name: sairedis_run_id
+  type: string
+  default: ''
+
+- name: vpp_artifact_name
+  type: string
+  default: vpp-trixie
+
+- name: image_artifact_name
+  type: string
+  default: docker-sai-test-vpp-platform
+
+jobs:
+- job: BuildSaiVppTestImage
+  displayName: Overlay PR VPP packages on SAI test image
+  timeoutInMinutes: ${{ parameters.timeout }}
+
+  pool:
+    vmImage: ubuntu-22.04
+
+  steps:
+  - checkout: self
+    clean: true
+
+  - task: DownloadPipelineArtifact@2
+    inputs:
+      artifact: ${{ parameters.vpp_artifact_name }}
+      path: $(Build.ArtifactStagingDirectory)/vpp
+    displayName: Download current-run VPP packages
+
+  - ${{ if eq(parameters.sairedis_run_id, '') }}:
+    - task: DownloadPipelineArtifact@2
+      name: downloadSaiRedis
+      inputs:
+        source: specific
+        project: build
+        pipeline: Azure.sonic-sairedis
+        artifact: docker-sai-test-vpp
+        path: $(Build.ArtifactStagingDirectory)/sairedis
+        runVersion: latestFromBranch
+        runBranch: refs/heads/master
+      displayName: Download latest successful SAI VPP test image
+
+  - ${{ if ne(parameters.sairedis_run_id, '') }}:
+    - task: DownloadPipelineArtifact@2
+      name: downloadSaiRedis
+      inputs:
+        source: specific
+        project: build
+        pipeline: Azure.sonic-sairedis
+        artifact: docker-sai-test-vpp
+        path: $(Build.ArtifactStagingDirectory)/sairedis
+        runVersion: specific
+        runId: ${{ parameters.sairedis_run_id }}
+      displayName: Download specified SAI VPP test image
+
+  - script: |
+      set -euxo pipefail
+
+      vpp_dir="$(Build.ArtifactStagingDirectory)/vpp"
+      sairedis_dir="$(Build.ArtifactStagingDirectory)/sairedis"
+      context_dir="$(Build.ArtifactStagingDirectory)/overlay-context"
+      output_dir="$(Build.ArtifactStagingDirectory)/output"
+      deb_dir="$context_dir/debs"
+      base_image_tag="$(cat "$sairedis_dir/image-tag.txt")"
+      image_tag="docker-sai-test-vpp:$(Build.DefinitionName).$(Build.BuildNumber).platform-vpp"
+
+      test -s "$sairedis_dir/docker-sai-test-vpp.gz"
+      test -s "$sairedis_dir/provenance.txt"
+      test -s "$sairedis_dir/SHA256SUMS"
+      for contract_file in \
+          ci-matrix-tests.txt \
+          ci-pass-tests.txt \
+          evaluate_ci_baseline.py \
+          gen_compatibility_matrix.py; do
+          test -s "$sairedis_dir/ci-contract/$contract_file"
+      done
+      (
+          cd "$sairedis_dir"
+          sha256sum -c SHA256SUMS
+      )
+
+      rm -rf "$context_dir" "$output_dir"
+      mkdir -p "$deb_dir" "$output_dir/ci-contract"
+
+      copy_one_deb()
+      {
+          local pattern="$1"
+          mapfile -t matches < <(find "$vpp_dir" -type f -name "$pattern" | sort)
+          if [[ "${#matches[@]}" -ne 1 ]]; then
+              echo "Expected exactly one $pattern package, found ${#matches[@]}" >&2
+              printf '  %s\n' "${matches[@]}" >&2
+              exit 1
+          fi
+          cp -v "${matches[0]}" "$deb_dir/"
+      }
+
+      copy_one_deb 'libvppinfra_*_amd64.deb'
+      copy_one_deb 'vpp_*_amd64.deb'
+      copy_one_deb 'vpp-plugin-core_*_amd64.deb'
+      copy_one_deb 'vpp-plugin-dpdk_*_amd64.deb'
+      cp -v .azure-pipelines/Dockerfile.sai-vpp-overlay "$context_dir/Dockerfile"
+
+      docker load -i "$sairedis_dir/docker-sai-test-vpp.gz"
+      docker image inspect "$base_image_tag" >/dev/null
+      docker build --no-cache \
+          --build-arg "BASE_IMAGE=$base_image_tag" \
+          --label com.sonic.saivpp-ci=true \
+          --label "com.sonic.platform-vpp.source=$(Build.SourceVersion)" \
+          -t "$image_tag" \
+          "$context_dir"
+
+        base_packages="$output_dir/base-package-inventory.txt"
+        derived_packages="$output_dir/derived-package-inventory.txt"
+        docker run --rm --entrypoint dpkg-query "$base_image_tag" \
+          -W -f='${binary:Package}\t${Version}\n' | sort > "$base_packages"
+        docker run --rm --entrypoint dpkg-query "$image_tag" \
+          -W -f='${binary:Package}\t${Version}\n' | sort > "$derived_packages"
+
+        package_changes="$output_dir/package-changes.txt"
+        comm -3 "$base_packages" "$derived_packages" > "$package_changes"
+        if awk '
+          {
+            package = $1
+            sub(/^[[:space:]]+/, "", package)
+            if (package != "libvppinfra" &&
+              package != "vpp" &&
+              package != "vpp-plugin-core" &&
+              package != "vpp-plugin-dpdk") {
+              print
+              unexpected = 1
+            }
+          }
+          END { exit unexpected }
+        ' "$package_changes"; then
+          :
+        else
+          echo "Derivative image changed packages outside the VPP overlay:" >&2
+          cat "$package_changes" >&2
+          exit 1
+        fi
+
+        package_identity="$output_dir/sairedis-package-identity.txt"
+        for package in \
+          libsairedis \
+          libsaivs \
+          libsaimetadata \
+          saiserver \
+          python-saithrift; do
+          base_entry="$(grep -E "^${package}(:[^[:space:]]+)?[[:space:]]" "$base_packages")"
+          derived_entry="$(grep -E "^${package}(:[^[:space:]]+)?[[:space:]]" "$derived_packages")"
+          test -n "$base_entry"
+          test "$base_entry" = "$derived_entry"
+          echo "$derived_entry" >> "$package_identity"
+        done
+
+      docker save "$image_tag" | gzip -c > "$output_dir/docker-sai-test-vpp.gz"
+      echo "$image_tag" > "$output_dir/image-tag.txt"
+      cp -a "$sairedis_dir/ci-contract/." "$output_dir/ci-contract/"
+      cp -v "$sairedis_dir/provenance.txt" "$output_dir/sairedis-provenance.txt"
+      cp -v "$sairedis_dir/SHA256SUMS" "$output_dir/SAIREDIS_SHA256SUMS"
+
+      provenance="$output_dir/platform-vpp-provenance.txt"
+      {
+          echo "build_definition=$(Build.DefinitionName)"
+          echo "build_number=$(Build.BuildNumber)"
+          echo "build_id=$(Build.BuildId)"
+          echo "source_version=$(Build.SourceVersion)"
+          echo "source_branch=$(Build.SourceBranch)"
+          echo "sairedis_requested_run_id=${{ parameters.sairedis_run_id }}"
+          echo "sairedis_downloaded_build=$(downloadSaiRedis.BuildNumber)"
+          echo "sairedis_base_image=$base_image_tag"
+          echo "derived_image=$image_tag"
+          echo
+          echo "replacement_packages:"
+          for deb in "$deb_dir"/*.deb; do
+              echo "File=$(basename "$deb")"
+              dpkg-deb -f "$deb" Package Version Architecture
+              sha256sum "$deb"
+          done
+      } > "$provenance"
+
+      cp -a "$deb_dir" "$output_dir/vpp-debs"
+      (
+          cd "$output_dir"
+          sha256sum \
+            docker-sai-test-vpp.gz \
+            base-package-inventory.txt \
+            derived-package-inventory.txt \
+              image-tag.txt \
+            package-changes.txt \
+              platform-vpp-provenance.txt \
+            sairedis-package-identity.txt \
+              sairedis-provenance.txt \
+              SAIREDIS_SHA256SUMS \
+            ci-contract/* \
+            vpp-debs/* > SHA256SUMS
+      )
+      rm -rf "$context_dir" "$vpp_dir" "$sairedis_dir"
+    displayName: Build VPP PR SAI test image
+
+  - publish: $(Build.ArtifactStagingDirectory)/output
+    artifact: ${{ parameters.image_artifact_name }}
+    displayName: Archive VPP PR SAI test image
\ No newline at end of file
diff --git a/.azure-pipelines/test-sai-vpp-template.yml b/.azure-pipelines/test-sai-vpp-template.yml
new file mode 100644
index 00000000..2ccf5853
--- /dev/null
+++ b/.azure-pipelines/test-sai-vpp-template.yml
@@ -0,0 +1,134 @@
+parameters:
+- name: timeout
+  type: number
+  default: 360
+
+- name: image_artifact_name
+  type: string
+  default: docker-sai-test-vpp-platform
+
+- name: log_artifact_name
+  type: string
+  default: sai-vpp-test-results
+
+jobs:
+- job: RunSaiVppMatrix
+  displayName: Run VPP SAI compatibility tests
+  timeoutInMinutes: ${{ parameters.timeout }}
+
+  pool: sonictest
+
+  steps:
+  - checkout: none
+
+  - task: DownloadPipelineArtifact@2
+    inputs:
+      artifact: ${{ parameters.image_artifact_name }}
+      path: $(Build.ArtifactStagingDirectory)/download
+    displayName: Download VPP PR SAI test image
+
+  - script: |
+      set -u
+      mapfile -t stale_containers < <(sudo docker ps -aq --filter label=com.sonic.saivpp-ci=true)
+      if [[ "${#stale_containers[@]}" -gt 0 ]]; then
+          sudo docker rm -f "${stale_containers[@]}"
+      fi
+      mapfile -t stale_images < <(sudo docker image ls -q --filter label=com.sonic.saivpp-ci=true | sort -u)
+      if [[ "${#stale_images[@]}" -gt 0 ]]; then
+          sudo docker image rm -f "${stale_images[@]}"
+      fi
+    displayName: Clean stale VPP SAI test resources
+
+  - script: |
+      set -euxo pipefail
+
+      download_dir="$(Build.ArtifactStagingDirectory)/download"
+      results_dir="$(Build.ArtifactStagingDirectory)/sai-vpp-results"
+      xml_dir="$results_dir/xml"
+      log_dir="$results_dir/log"
+      image_tag="$(cat "$download_dir/image-tag.txt")"
+
+      (
+          cd "$download_dir"
+          sha256sum -c SHA256SUMS
+      )
+      mkdir -p "$xml_dir" "$log_dir"
+      chmod 0777 "$xml_dir" "$log_dir"
+      sudo docker load -i "$download_dir/docker-sai-test-vpp.gz"
+      sudo docker image inspect "$image_tag" > "$results_dir/image-inspect.json"
+
+      set +e
+      sudo docker run --rm --privileged \
+          --name "saivpp-ci-$(Build.BuildId)-$(System.JobAttempt)" \
+          --label com.sonic.saivpp-ci=true \
+          -e PORT_COUNT=32 \
+          -e ISOLATE_EACH_TEST=1 \
+          -e STARTUP_TIMEOUT=180 \
+          -v "$xml_dir:/test-results" \
+          -v "$log_dir:/var/log" \
+          "$image_tag" \
+          sai_route_test sai_rif_test sai_neighbor_test sai_ecmp_test \
+          2>&1 | tee "$results_dir/run.log"
+      matrix_rc=${PIPESTATUS[0]}
+      set -e
+
+      echo "$matrix_rc" > "$results_dir/matrix.rc"
+      sudo chown -R "$(id -u):$(id -g)" "$results_dir"
+      chmod -R a+rX "$results_dir"
+      echo "VPP SAI matrix exit code: $matrix_rc"
+    displayName: Run VPP SAI full matrix
+
+  - script: |
+      set -euxo pipefail
+
+      download_dir="$(Build.ArtifactStagingDirectory)/download"
+      results_dir="$(Build.ArtifactStagingDirectory)/sai-vpp-results"
+      contract_dir="$download_dir/ci-contract"
+      matrix_rc="$(cat "$results_dir/matrix.rc")"
+
+      python3 -c 'import defusedxml' 2>/dev/null || sudo uv pip install --system defusedxml
+      python3 "$contract_dir/gen_compatibility_matrix.py" \
+          "$results_dir/xml" "$results_dir/compatibility-matrix.md"
+      python3 "$contract_dir/evaluate_ci_baseline.py" \
+          --xml-dir "$results_dir/xml" \
+          --baseline "$contract_dir/ci-pass-tests.txt" \
+          --expected "$contract_dir/ci-matrix-tests.txt" \
+          --matrix-rc "$matrix_rc" \
+          --report "$results_dir/baseline-report.txt"
+    displayName: Evaluate VPP SAI stable baseline
+
+  - task: PublishTestResults@2
+    inputs:
+      testResultsFormat: JUnit
+      searchFolder: $(Build.ArtifactStagingDirectory)/sai-vpp-results/xml
+      testResultsFiles: TEST-*.xml
+      testRunTitle: VPP SAI PTF - platform-vpp
+      failTaskOnFailedTests: false
+      failTaskOnMissingResultsFile: true
+    condition: always()
+
+  - script: |
+      set -euxo pipefail
+      download_dir="$(Build.ArtifactStagingDirectory)/download"
+      results_dir="$(Build.ArtifactStagingDirectory)/sai-vpp-results"
+      cp -v "$download_dir/platform-vpp-provenance.txt" "$results_dir/"
+      cp -v "$download_dir/sairedis-provenance.txt" "$results_dir/"
+      cp -v "$download_dir/SHA256SUMS" "$results_dir/"
+      cp -v "$download_dir/SAIREDIS_SHA256SUMS" "$results_dir/"
+    displayName: Collect VPP SAI provenance
+    condition: always()
+
+  - publish: $(Build.ArtifactStagingDirectory)/sai-vpp-results
+    artifact: ${{ parameters.log_artifact_name }}@$(System.JobAttempt)
+    displayName: Publish VPP SAI logs and results
+    condition: always()
+
+  - script: |
+      set -u
+      tag_file="$(Build.ArtifactStagingDirectory)/download/image-tag.txt"
+      if [[ -f "$tag_file" ]]; then
+          image_tag="$(cat "$tag_file")"
+          sudo docker image rm "$image_tag" || true
+      fi
+    displayName: Clean VPP SAI test image
+    condition: always()
\ No newline at end of file
diff --git a/README.md b/README.md
index 12e8de04..a91401e8 100644
--- a/README.md
+++ b/README.md
@@ -48,6 +48,14 @@ Refer to the [Getting started](docs/README.getting-started.md) document in docs
 
 Refer to the [document](docs/README.sonic_vm.md) in docs directory for details. 
 
+# VPP SAI compatibility CI
+
+The Azure pipeline builds the Trixie VPP packages from the current commit and tests them with the VPP SAI unit-test framework published by `sonic-sairedis`. `BuildSaiVppTestImage` downloads an approved `docker-sai-test-vpp` artifact, installs only the current run's `libvppinfra`, `vpp`, `vpp-plugin-core`, and `vpp-plugin-dpdk` packages in a derivative image, verifies that every non-VPP Debian package is unchanged, and publishes combined provenance and checksums.
+
+`TestSaiVpp` runs the four-module compatibility matrix on the `sonictest` pool. The expected 85-selector matrix, 34-selector stable-pass baseline, evaluator, and matrix generator come from the same approved sairedis artifact as the base image, so this repository does not carry a copy of sairedis test policy.
+
+By default, the pipeline selects the latest successful `Azure.sonic-sairedis` master artifact. Set the optional `sairedis_run_id` pipeline parameter to an immutable Azure build ID to validate against a specific sairedis image. Privileged test execution must retain the repository's trusted-maintainer authorization policy for pull requests.
+
 
 # Troubleshooting
 
diff --git a/azure-pipelines.yml b/azure-pipelines.yml
index b6eecfdd..5aa5f1d2 100644
--- a/azure-pipelines.yml
+++ b/azure-pipelines.yml
@@ -32,6 +32,9 @@ parameters:
   - name: arch
     type: string
     default: amd64
+  - name: sairedis_run_id
+    type: string
+    default: ''
 
 variables:
   - name: BUILD_BRANCH
@@ -52,3 +55,19 @@ stages:
     parameters:
       arch: amd64
       debian_version: bookworm
+
+- stage: BuildSaiVppTestImage
+  displayName: Build VPP PR SAI test image
+  dependsOn: BuildVpp
+  condition: succeeded('BuildVpp')
+  jobs:
+  - template: .azure-pipelines/build-sai-vpp-test-image-template.yml
+    parameters:
+      sairedis_run_id: ${{ parameters.sairedis_run_id }}
+
+- stage: TestSaiVpp
+  displayName: Test VPP PR against SAI compatibility matrix
+  dependsOn: BuildSaiVppTestImage
+  condition: succeeded('BuildSaiVppTestImage')
+  jobs:
+  - template: .azure-pipelines/test-sai-vpp-template.yml