---
title: MBUF_TC_BK
framework: Kernel
role: symbol
role_heading: Enumeration Case
platforms: [macOS 10.7+]
path: kernel/mbuf_traffic_class_t/mbuf_tc_bk
---

# MBUF_TC_BK

## Declaration

```occ
MBUF_TC_BK = 1
```

## Discussion

Discussion Background, low priority or bulk traffic.