Table 6-5 Ip Precedence And Diffserv Values Comparison - NEC Sl2100 Networking Manual

ISSUE 1.0
Type: IP (0x0800)
Internet Protocol, Src Addr: 172.16.0.21 (172.16.0.21), Dst Addr: 172.16.0.101
(172.16.0.101)
Version: 4
Header length: 20 bytes
Diff Services Field: 0xa0 (DSCP 0x28: Class Selector 5; ECN: 0x00)
1010 00.. = Diff Services Codepoint: Class Selector 5 (0x28)
.... ..0. = ECN-Capable Transport (ECT): 0
.... ...0 = ECN-CE: 0
Total Length: 44
Identification: 0x0069 (105)
Flags: 0x00
0... = Reserved bit: Not set
.0.. = Don't fragment: Not set
..0. = More fragments: Not set
Fragment offset: 0
Time to live: 30
Protocol: UDP (0x11)
Header checksum: 0x431e (correct)
Source: 172.16.0.21 (172.16.0.21)
Destination: 172.16.0.101 (172.16.0.101)
User Datagram Protocol, Src Port: 10020 (10020), Dst Port: 10022 (10022)
Source port: 10020 (10020)
Destination port: 10022 (10022)
Length: 24
Checksum: 0x5293 (correct)
Real-Time Transport Protocol
Stream setup by SDP (frame 112)
Setup frame: 112
Setup Method: SDP
10.. .... = Version: RFC 1889 Version (2)
..1. .... = Padding: True
...0 .... = Extension: False
.... 0000 = Contributing source identifiers count: 0
0... .... = Marker: False
.001 0010 = Payload type: ITU-T G.729 (18)
Sequence number: 30885
Timestamp: 20560
Synchronization Source identifier: 732771006
Payload: 3ED0
Padding data: 00
Padding count: 2
6.6 Comparison of IP Precedence and Diffserv Values
As stated earlier, IP Precedence and Diffserv use the same 8-bit ToS field in the IP header to mark
packets. It is possible to have the same ToS value for either method which means that the two
methods can work alongside each other.
For example, if the VoIP equipment supports IP Precedence and the router can prioritize only using
the DSCP they can be set to the same value. Refer to
Comparison on page 6-17

Table 6-5 IP Precedence and Diffserv Values Comparison

DSCP Decimal DSCP Binary
0
1
2
3
4
5
6
7
Networking Manual
for the values.
IP Precedence
000000
000001
000010
000011
000100
000101
000110
000111
Table 6-5 IP Precedence and Diffserv Values
0 Class Selector 0
SL2100
Description
6-17