IP1718 LF
Preliminary Data Sheet
14/33
January 27, 2005
Copyright © 2003, IC Plus Corp.
IP1718 LF-DS-R05
4.2.5 Trunk Channel
Supporting up to 3 trunk channels, the IP1718 LF provides a versatile configurations that fit many
applications. Each trunk channel may comprise 2 to 4 ports. The traffic of the destination port passing
through the trunk channel is defined by the registers 68H to 6AH. The hash algorithm from which the
IP1718 LF derives the trunk ID is specified by registers 2FH. The result calculated by the hash algorithm
is mapped to the trunk ID. A physical port can forward the trunk traffic only when the trunk ID decided by
hash algorithm matches the setting of the Trunk Configuration register. The following table describes the
traffic distribution rule.
The Behavior for Each Port in a Trunk
Result of the Hash Algorithm
Trunk Channel Configuration
Behavior of the Member of Trunk
4’bXXX1
Forward the data through the first
port of this group
2’b00
4’bXXX0
Do not forward the data through the
first port of this group
4’bXX1X
Forward the data through the
second port of this group
2’b01
4’bXX0X
Do not forward the data through the
second port of this group
4’bX1XX
Forward the data through the third
port of this group
2’b10
4’bX0XX
Do not forward the data through the
third 7 port of this group
4’b1XXXX
Forward the data through the fourth
port of this group
2’b11
4’b0XXXX
Do not forward the data through the
fourth port of this group
There are four ports for each trunk and each port can be configured to fit the trunk traffic as depicted
above.
4.2.6 Port Mirroring
There are some circumstances that the network administrator requires to monitor the network status.
The port mirroring function can help the network administrator diagnose the network.
A port mirroring function can be accomplished by assigning a monitored port(source port) and a
snooping port (destination port). The IP1718 LF supports three kinks of mirroring methods: the ingress,
the egress and ingress plus egress. This function can be enabled by programming the corresponding bit
in registers 6BH to 6DH.
Registers 6BH and 6CH defined the port which will be monitored(mirroring source). The register 6DH
specifies the port which will snoop( mirroring destination) and the mirroring method.
4.2.7 Queue Management
The IP1718 LF supports three kinds of priority management: The first in first out, the strict priority and the
weighted-round-robin.
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