KSZ8863RLL-EVAL Micrel Inc, KSZ8863RLL-EVAL Datasheet - Page 34

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KSZ8863RLL-EVAL

Manufacturer Part Number
KSZ8863RLL-EVAL
Description
BOARD EVALUATION FOR KSZ8863RLL
Manufacturer
Micrel Inc
Datasheet

Specifications of KSZ8863RLL-EVAL

Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Other names
576-3868
Micrel, Inc.
Rapid Spanning Tree Support
There are three operational states of the Discarding, Learning, and Forwarding assigned to each port for RSTP:
Discarding ports do not participate in the active topology and do not learn MAC addresses.
Discarding state: the state includs three states of the disable, blocking and listening of STP.
Port setting: "transmit enable = 0, receive enable = 0, learning disable = 1."
Software action: the processor should not send any packets to the port. The switch may still send specific packets to the
processor (packets that match some entries in the static table with “overriding bit” set) and the processor should discard
those packets. When disable the port’s learning capability (learning disable=’1’), set the register 2 bit 5 and bit 4 will flush
rapidly the port related entries in the dynamic MAC table and static MAC table.
Note: processor is connected to port 3 via MII interface. Address learning is disabled on the port in this state.
Ports in Learning states learn MAC addresses, but do not forward user traffic.
Learning state: only packets to and from the processor are forwarded. Learning is enabled.
Port setting: “transmit enable = 0, receive enable = 0, learning disable = 0.”
Software action: The processor should program the static MAC table with the entries that it needs to receive (e.g., BPDU
packets). The “overriding” bit should be set so that the switch will forward those specific packets to the processor. The
processor may send packets to the port(s) in this state, see “Tail Tagging Mode” section for details. Address learning is
enabled on the port in this state.
November 2009
Disable State
The port should
not forward or
receive any
packets. Learning
is disabled.
Blocking State
Only packets to
the processor are
forwarded.
Learning is
disabled.
Listening State
Only packets to
and from the
processor are
forwarded.
Learning is
disabled.
Learning State
Only packets to
and from the
processor are
forwarded.
Learning is
enabled.
Forwarding State
Packets are
forwarded and
received
normally.
Learning is
enabled.
Port Setting
“transmit
enable = 0,
receive enable
= 0, learning
disable =1”
Port Setting
“transmit
enable = 0,
receive enable
= 0, learning
disable =1”
Port Setting
“transmit
enable = 0,
receive enable
= 0, learning
disable =1”
Port Setting
“transmit
enable = 0,
receive enable
= 0, learning
disable = 0”
Port Setting
“transmit
enable = 1,
receive
enable = 1,
learning
disable = 0”
Software Action
Software Action
The processor should not send any packets to the port. The switch may still
send specific packets to the processor (packets that match some entries in
the “static MAC table” with “overriding bit” set) and the processor should
discard those packets. Address learning is disabled on the port in this
state.
Software Action
The processor should not send any packets to the port(s) in this state. The
processor should program the “Static MAC table” with the entries that it
needs to receive (for example, BPDU packets). The “overriding” bit should
also be set so that the switch will forward those specific packets to the
processor. Address learning is disabled on the port in this state.
Software Action
The processor should program the “Static MAC table” with the entries that it
needs to receive (for example, BPDU packets). The “overriding” bit should
be set so that the switch will forward those specific packets to the
processor. The processor may send packets to the port(s) in this state. See
“Tail Tagging Mode” for details. Address learning is disabled on the port in
this state.
The processor should program the “Static MAC table” with the entries that it
needs to receive (for example, BPDU packets). The “overriding” bit should
be set so that the switch will forward those specific packets to the
processor. The processor may send packets to the port(s) in this state. See
“Tail Tagging Mode” for details. Address learning is enabled on the port in
this state.
Software Action
The processor programs the “Static MAC table” with the entries that it
needs to receive (for example, BPDU packets). The “overriding” bit is set so
that the switch forwards those specific packets to the processor. The
processor can send packets to the port(s) in this state. See “Tail Tagging
Mode” for details. Address learning is enabled on the port in this state.
Table 12. Spanning Tree States
34
KSZ8863MLL/FLL/RLL
M9999-110309-1.1

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