Airlive POE-GSH1602M handleiding
Handleiding
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IP Precedence/DSCP Field
According to RFC791 definition, ToS (Type of Service) domain in the IP message
header is composed of 8 bits. Among them, the 3-bit long Precedence field, as located
in the following, identifies the IP message priority.
IP Precedence/DSCP Field
0 to 2 bits are Precedence fields representing the 8 priorities of message transmission
ranging from 7 to 0 from high to low, with either Level 7 or 6 as the highest priority that
is generally reserved for routing or updating network control communication. User-level
applications only have access to Level 0 to 5.
ToS domain, in addition to Precedence fields, also includes D, T and R bits:
D-bit represents the Delay requirement (0 for normal delay and 1 for low delay).
T-bit represents the throughput (0 for normal throughput and 1 for high throughput). R-
bit represents the reliability (0 for normal reliability and 1 for high reliability). ToS domain
reserves the 6 and 7 bits.
RFC1349 redefines the ToS domain by adding a C-bit to represent the Monetary Cost.
The IETF DiffServ group then redefines the 0 to 5 bits of ToS domain in the IPv4
message header of RFC2474 as DSCP and renames it as DS (Differentiated Service)
byte as shown in the figure above.
The first 6 bits (0-5 bits) of DS field distinguish the DSCP (DS Code Point), and the
higher 2 bits (6-7 bits) are reserved. The lower 3 bits (0-2 bits) are CSCP (Class
Selector Code Point), with the same CSCP value representing the DSCP of the same
class. DS nodes select corresponding PHB (Per-Hop Behavior) according to DSCP
values.
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Productinformatie
| Merk | Airlive |
| Model | POE-GSH1602M |
| Categorie | Niet gecategoriseerd |
| Taal | Nederlands |
| Grootte | 71337 MB |
