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IP175C/IP175C LF/IP175CH/IP175CH LF
Data Sheet
2.7.2
Packet from LAN to WAN
1. PC0 sends a packet to a LAN port with SA equal to PC0 without PVID or
PVID equal to 1
2. IP175C/IP175CH forwards the packet to CPU (MII0) with PVID equal to 1.
3. CPU replaces the SA with locked address PC3, replaces PVID with 2 and sends it to IP175C/IP175CH.
4. IP175C/IP175CH forwards the packet to port4 (WAN port).
PHY0
CPU
4 LAN ports (PVID=1)
MAC5
MAC0
PHY1
MAC1
PHY2
MAC2
PHY3
MAC3
PHY4
MAC4
DA
SA
CPU
PC0
PVID
1
DA
SA
CPU
PC0
PVID
none or 1
(1)
(2)
DA
SA
WAN
PVID
PC3
2
(3)
(4)
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Mar 09, 2007
Copyright © 2004, IC Plus Corp.
IP175C/IP175CH-DS-R14
DA
SA
WAN
PVID
PC3
none
1 WAN ports (PVID=2)
locked SA=PC3
2.7.3
Packet from WAN to LAN
1.
WAN port receives a packet with locked address PC3.
2.
IP175C/IP175CH adds a PVID equal to 2 and forwards the packet to CPU (MII0).
3.
CPU updates the DA, replaces PVID with 1 and sends it to IP175C/IP175CH.
4.
IP175C/IP175CH learns the SA.
5.
IP175C/IP175CH forwards the packet to port0 according to the DA.
PHY0
CPU
4 LAN ports (PVID=1)
MAC5
MAC0
PHY1
MAC1
PHY2
MAC2
PHY3
MAC3
PHY4
MAC4
DA
SA
PC0
CPU
PVID
1
DA
SA
PC0
CPU
PVID
none
(5)
(3)
DA
SA
PC3
WAN
PVID
2
(2)
(4) Learning SA=CPU
locked SA=PC3
(1)
DA
SA
PC3
PVID
WAN
none
1 WAN ports (PVID=2)
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