Specifications

Watson 5 Ethernet
Operating Manual
W5-Ethernet-Manual.doc
Version 2.0-01
3-16 Revision: 2006-04-27
Ingress
Port
Classifier
Q4
Q3
Q2
Q1
Ingress
Rate
Limiters
Output
Queues
Scheduler
Egress
rate
limiter
Egress
Port
Figure 3-12: Class of Service functions
When a packet enters the Watson 5 Ethernet plugin its priority is be classified either by layer 2 in-
formation (IEEE 802.1p bits in the VLAN tag) or by layer 3 information (DSCP in the IP header).
The packet is then associated with one of the priority levels.
On ingress each priority level can be individually rate limited according to the following rules:
! Q1 can be limited to 128 kbps, 256 kbps, 512 kbps, 1'024 kbps, 2'048 kbps, 4'096 kbps or
8'192 kbps
! Each higher priority level can be rate limited either to the same rate as the next lower priority
level or to twice as much.
Table 3-4 gives an overview of all possible rate combinations (k " kbit/s, M " MBit/s):
Profile Q1 Q2 Q3 Q4 Profile Q1 Q2 Q3 Q4
1
128k
128k
128k 128k
2
128k
128k
128k 256k
3
256k
256k
256k 256k
4
256k
256k
256k 512k
5
512k
512k
512k 512k
6
512k
512k
512k 1M
7
1M
1M
1M 1M
8
1M
1M
1M 2M
9
2M
2M
2M 2M
10
2M
2M
2M 4M
11
4M
4M
4M 4M
12
4M
4M
4M 8M
13
8M
8M
8M 8M
14
8M
8M
8M 16M
15
128k
256k
256k 256k
16
128k
256k
256k 512k
17
256k
512k
512k 512k
18
256k
512k
512k 1M
19
512k
1M
1M 1M
20
512k
1M
1M 2M
21
1M
2M
2M 2M
22
1M
2M
2M 4M
23
2M
4M
4M 4M
24
2M
4M
4M 8M
25
4M
8M
8M 8M
26
4M
8M
8M 16M
27
8M
16M
16M 16M
28
8M
16M
16M 32M
29
128k
128k
256k 256k
30
128k
128k
256k 512k
31
256k
256k
512k 512k
32
256k
256k
512k 1M
33
512k
512k
1M 1M
34
512k
512k
1M 2M
35
1M
1M
2M 2M
36
1M
1M
2M 4M
37
2M
2M
4M 4M
38
2M
2M
4M 8M
39
4M
4M
8M 8M
40
4M
4M
8M 16M
41
8M
8M
16M 16M
42
8M
8M
16M 32M
43
128k
256k
512k 512k
44
128k
256k
512k 1M
45
256k
512k
1M 1M
46
256k
512k
1M 2M
47
512k
1M
2M 2M
48
512k
1M
2M 4M
49
1M
2M
4M 4M
50
1M
2M
4M 8M
51
2M
4M
8M 8M
52
2M
4M
8M 16M
53
4M
8M
16M 16M
54
4M
8M
16M 32M
55
8M
16M
32M 32M
56
8M
16M
32M 64M
Table 3-4: Ingress rate limiter profiles