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Watson Ethernet
Operating Manual
Watson-Ethernet-Manual.doc
Version 3.3-01
3-16
Revision: 2010-01-20
Figure 3-13: Ingress rate limiter example
After classification and rate limiting, the packets are sent to their output queues.
A scheduler will schedule packets according to their priorities and send them to
the egress port. The scheduler can be configured to work either in strict priority
mode or in weighted fair queuing mode with fixed weights 8:4:2:1 for
Q4:Q3:Q2:Q1 respectively. Scheduling policy is a global setting and affects all
ports simultaneously.
Finally the egress port can be rate limited according to the following profiles:
Profile
Rate
8
23.5M
7
11.8M
6
5.9M
5
2.9M
4
1.5M
3
734.4k
2
367.2k
Table 3-5: Egress rate limiter profiles
The profile number is used in the RATELIMIT OUT command to configure a par-
ticular egress rate. Only the entire port after scheduling can be rate limited, there
are no individual queues at this stage.
Note:
CoS functions are not available on the Watson Ethernet tabletop modems.
3.2.9 Spanning Tree Protocol
The Watson Ethernet plug-in modems support the Rapid Spanning Tree (RSTP)
protocol according to IEEE 802.1D-2004.
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