Qos detailed notes on cisco
QoS Notes QOS: The TX-ring (hardware queue) is always FIFO. Use show controller | i tx_limit. Queuing & Shaping can only be applied in an outbound direction to an interface. Policing can be applied inbound or outbound direction to an interface. If ACL does not exists, it is match-all traffic. cache-flow, is taken BEFORE any packet markings Local marking won’t show on the router, except one hop away. DSCP: IP precedence 6 and 7 should not be used according to Cisco Systems. It's used for control plane packets, protocol update, etc by the routing protocols. DSCP Binary Dec. IP Precedence comments Default 000000 0 routine CS1 001000 8 priority AF11 001010 10 AF12 001100 12 AF13 001110 14 CS2 010000 16 immediate AF21 010010 18 AF22 010100 20 AF23 010110 22 CS3 011000 24 flash Voice/ Video Signaling A