User's Manual Part 1

xxiv APCD-LM043-8.0 (DRAFT C)
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What’s New in Version 4.0
Version 4.0 introduced the following CCU and EUM features:
Switched Ethernet Mode and Through Only Mode
The CCU can now act as an Ethernet Switch, with the CCU Ethernet and radio interfaces in
the same Ethernet domain, rather than as a router. Packets arriving at the CCU from the radio
port are switched either out the Ethernet port, back out the radio port, to the application and/or
all three based on the Ethernet header. The switching function on the radio side is identical to
Routed mode, but the Ethernet port (in promiscuous receive mode) is added as one more port
to switch to. A bridge table is maintained for the Ethernet port, similar to that at the EUM,
except that no restriction on “air access” is made.
Through Only mode is identical to Switched Ethernet mode, except that traffic from the radio
port (including broadcast) is not switched back out the radio port—it is sent out the Ethernet
port instead. This allows the operator to monitor and control traffic between users on the same
CCU and is probably most useful with PPPoE operations.
The default mode from the factory is Switched Ethernet mode, but a CCU upgraded from
version 3.x remains in Routed mode.
No change is required to the EUMs to support Switched Ethernet or Through Only mode.
NOTE: This allows for multiple IP subnets in the system. That is, PCs
could be given public IP addresses and EUMs could be given
private IP addresses.
The CCU has only one IP address in these modes (which is the same as the radio IP address
in routed mode). It is printed as “IP address” rather than “Ethernet IP address” or “Radio IP
address”.
Several new routing protocol statistics have been added to record this activity.
Command changes in Switched Ethernet (and Through Only) Mode
The protocol command at the CCU selects between “routed”, “switched”, and “through”.
The current mode is also reported in the BCF. It does not take effect until a reboot.
The ip eth and ip rad commands both set or report the IP address.
The bridge and customer commands now display the Ethernet bridge table on the CCU.
PPPoE Support
PPPoE packets are now permitted through the network. Since PPPoE is an Ethernet subnet
restricted protocol, the packets only pass from the radio side to the Ethernet side of a CCU in
Switched Ethernet or Through Only mode.