Errors when trying to collect data from Cisco IOS-XE switch

[purpose-robot]

Question

Hello there,

I am trying to use Vector to collect telemetry data from a Cisco IOS-XE switch. More information can be found here.

The data is sent from the device using gRPC and is encoded as self-describing GPB (KV-GPB).

I used to following protobuf definition: Link to telemetry.proto and specified the generated file in the configuration.

However, I got the following error message and I am not sure how to solve this issue.

I use the current Docker image of Vector: timberio/vector:0.49.0-alpine and currently I print to stdout for testing.

Telegraf does also support collecting telemetry from Cisco switches but they used a different approch: Link to Github

Vector Config

api:
  enabled: true

sources:
  cisco:
    type: socket
    address: 0.0.0.0:9000
    mode: tcp
    decoding:
      codec: protobuf
      protobuf:
        desc_file: telemetry.proto.pb
        message_type: telemetry.Telemetry
    keepalive:
      time_secs: 30
    receive_buffer_bytes: 4000000

sinks:
  console:
    type: console
    inputs:
      - cisco
    target: stdout
    encoding:
      codec: json
      json:
        pretty: true

Vector Logs

2025-09-10T17:08:16.582497Z ERROR source{component_kind="source" component_id=cisco component_type=socket}:connection{peer_addr=172.42.0.1:58257}: vector::internal_events::codecs: Failed deserializing frame. error=Error parsing protobuf: DecodeError { description: "invalid wire type: SixtyFourBit (expected Varint)", stack: [] } error_code="decoder_deserialize" error_type="parser_failed" stage="processing" internal_log_rate_limit=true