Information Technology Reference
In-Depth Information
TAblE 2-1
Cisco QoS Baseline
Application Type
Classification
Relevant Standard
Recommended QoS Configuration
IP routing
CS6 (DSCP 48)
RFC 2474
Rate-based queuing + RED
Voice (bearer/media)
EF (DSCP 46)
RFC 3246
RSVP CAC + Priority queuing
Interactive video
AF41 (DSCP 34)
RFC 2597
RSVP + Rate-based queuing + DSCP WRED
Streaming video
CS4 (DSCP 32)
RFC 2474
RSVP + Rate-based queuing + RED
Mission-critical data
AF31 (DSCP 26)
RFC 2597
Rate-based queuing + DSCP WRED
Call signaling
CS3 (DSCP 24)
RFC 2474
Rate-based queuing + RED
Transactional data
(Interactive apps)
AF21 (DSCP 28)
RFC 2597
Rate-based queuing + DSCP WRED
Network management
CS2 (DSCP 16)
RFC 2474
Rate-based queuing + RED
Bulk data
(noninteractive
applications)
AF11 (DSCP 10)
RFC 2597
Rate-based queuing + DSCP
applications)
Scavenger (less than
best effort service)
CS1 (DSCP 8)
Internet 2 draft
No bandwidth guarantee + RED
Best effort
BE (DSCP 0)
RFC 2474
Bandwidth guarantee Rate-based Queuing + RED
Note that rate-based queuing and priority queuing in
Table 2-1
refer to class-based weighted fair queuing (CB-WFQ) and low-latency
queuing (LLQ), respectively.
Note that Cisco modified its recommendation for the marking of call signaling traffic (SCCP, H.323, and so on) from AF31 to CS3
(which is reflected in
Table 2-1).
However, many Cisco devices might still mark call control traffic as AF31.
