3com 3CB9LG9MC Manual De Usuario
Broadcast, Multicast, and Flood Rate Limiting
25
Example: If in a 1-second period, 3,500 fps are received from the
backplane port, 3,000 packets are transmitted out ports 3 and 10.
Port 11, however, which does not participate in module multicast rate
limiting, transmits the entire 3,500 fps.
backplane port, 3,000 packets are transmitted out ports 3 and 10.
Port 11, however, which does not participate in module multicast rate
limiting, transmits the entire 3,500 fps.
Port Multicast
Packet-ingress Rate
Limiting
You can define an ingress rate limit for multicast packets per port on the
36-port 10/100BASE-TX Desktop Switching Module. Ingress rate limiting
is on a per-port basis only.
36-port 10/100BASE-TX Desktop Switching Module. Ingress rate limiting
is on a per-port basis only.
To set packet-ingress multicast thresholds for participating front-panel
ports, in the
ports, in the
bridge port multicastLimit
menu:
1 Select the ports that you want to participate in multicast rate limiting and
set their individual packet-ingress thresholds.
2 Specify whether you want to activate or deactivate multicast rate limits
and packet-ingress thresholds on these ports:
■
BcastOnly
— Deactivates multicast rate limits and the
packet-ingress threshold on the selected ports.
This setting removes the selected ports from participating in the
module’s multicast rate limiting.
module’s multicast rate limiting.
■
McastBcast
— Activates multicast rate limits and the packet-ingress
threshold on the selected ports.
This setting allows the selected ports to participate in the module’s
multicast rate limiting.
multicast rate limiting.
These settings do not affect module broadcast or flood-rate limiting.
3 Enter the packet-ingress threshold that you want to use and the ports
that you want to limit using this threshold.
The range of permitted values is 0 to 200,000 fps. The default value is
4,000 fps. If incoming traffic exceeds the specified threshold on a
participating port for 7 continuous seconds, the module permanently
disables the port. User intervention is necessary to reenable the port.
4,000 fps. If incoming traffic exceeds the specified threshold on a
participating port for 7 continuous seconds, the module permanently
disables the port. User intervention is necessary to reenable the port.
Example:
CB9000@slot 5.1 [36L-E/FEN-TX-L2] (bridge/port):
multicastLimit
Select bridge ports (1-36|all|?) [1]:
Enter new frame type (BcastOnly,McastBcast): McastBcast
Enter new value (frames/sec). Enter 0 to filter all
(0-200000): 1000