Rate Limiting
Functions
Limits:
128 kbps
256 kbps
512 kbps
1024 kbps
2048 kbps
4096 kbps
8192 kbps
Limitation 256 kbps
Limitation 512 kbps
DSL 1 Mbps
RTU
Figure 8: Rate Limiting per port
In estimating the bandwidth, already when feeding in the data stream a later overload
situation can be avoided in the furthur network.
Default configuration:
In default configuration receive-rate-limit and transmit-rate-limit are not set.
Some typical estimations for bandwidth requirements are:
Data transmission type
Quality
ISDN-grade approx. 80 kbps
Voice over IP
Serial tunnel
Appr. 64 kbps
Still picture: H.264 approx. 440 kbps - 1,7
Mbps
Moving picture: MPEG-4 app. 735 kbps - 2,4
IP camera (VGA, 25 pictures per s)
MJPEG app. 8,8 Mbps - 12,1 Mbps
Appr. 64 kbps
Table 12:
Estimation of bandwidth requirement
When limiting the rate limiting only to certain frame type then the rate limiting can be used as
broadcast storm control.
Limit mode
Effect
all
The rate of all frames is limited
flooding
The rate of unicast frames with unknown tar-
get, multicast- and broadcast frames are lim-
ited.
multicast
The rate of multicast- and broadcast frames
are limited.
broadcast
The rate of broadcast frames is limited.
Table 13:
Rate limiting and frame types
Commands to configure the Rate limit
ing:
< s e t s w i t c h { p o r t . . . } l i m i t - m o d e { . . . } >
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