# tt_fabric_router_state

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## Name

### Prometheus Metric Name

```
tt_fabric_router_state
```

### Metric Path (tt-telemetry)

Schema:

```
{hostname}/tray{tray}/chip{chip}/channel{channel}/fabric/erisc{erisc_core}/tt_fabric_router_state
```

Example path:

```
bh-glx-c09u02/tray1/chip2/channel0/fabric/erisc0/tt_fabric_router_state
```

## Description

The router state of a specific eRISC core on a fabric Ethernet channel. Each Ethernet channel has one eRISC core on Wormhole and two on Blackhole. The router state indicates the current operational state of the fabric router running on the eRISC core. This metric is available on Wormhole B0 and Blackhole devices.

Note: Fabric metrics are only updated by fabric firmware when workloads are run with fabric telemetry explicitly enabled. For example, by setting the environment variable `TT_METAL_FABRIC_TELEMETRY` to `1`.

## Values

**Type:** Unsigned Integer

**Units:** None

**Allowable values:**
A non-negative integer representing the router state.

## Prometheus Labels

|Label Name|Value|
|---|---|
|hostname|The host from which the metric was collected.|
|hall|The datacenter hall where the host is located. Sourced from the Factory System Descriptor (FSD).|
|aisle|The datacenter aisle where the host is located. Sourced from the Factory System Descriptor (FSD).|
|rack|The rack number where the host is located. Sourced from the Factory System Descriptor (FSD).|
|shelf_u|The shelf U position in the rack where the host is located. Sourced from the Factory System Descriptor (FSD).|
|tray|The tray (UBB) that the device is located on.|
|chip|The ASIC location within the tray.|
|channel|The Ethernet channel number on the chip.|
|port_type|The physical port type (e.g., QSFP, backplane). Present when topology information is available.|
|port_id|The physical port ID. Present when topology information is available.|
|remote_hostname|The hostname of the remote endpoint. Present when remote endpoint information is available.|
|remote_tray|The tray number of the remote endpoint. Present when remote endpoint information is available.|
|remote_chip|The ASIC location of the remote endpoint. Present when remote endpoint information is available.|
|remote_channel|The Ethernet channel of the remote endpoint. Present when remote endpoint information is available.|
|remote_hall|The datacenter hall of the remote endpoint. Present when remote endpoint information is available.|
|remote_aisle|The datacenter aisle of the remote endpoint. Present when remote endpoint information is available.|
|remote_rack|The rack number of the remote endpoint. Present when remote endpoint information is available.|
|remote_shelf_u|The shelf U position of the remote endpoint. Present when remote endpoint information is available.|
|erisc_core|The eRISC core index (0 for Wormhole, 0-1 for Blackhole).|