Applications and features – Nokia MW1122 User Manual

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Applications and features

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Bridging only; only bridging is activated in the interface. In this
case the interface bridges all protocols.

Routing only; only IP address is configured in the interface. In this
case, the interface routes IP packets.

Bridging and routing; Bridging is activated in the interface and IP
address is configured in the interface. In this case, the interface
routes IP packets and bridges all other packets.

Slaved WLAN operation

The wireless LAN interface can be configured to operate as a slave to
the Ethernet interface. In this case, there is no need to configure the IP
address or bridging to the wireless LAN interface. The Ethernet and
the wireless LAN interface are bridged together internally and both
interfaces are treated as a single LAN interface. All LAN
configuration parameters defining bridging and IP-related parameters,
such as IP address, admin-disabled and RIP configuration address, are
used for both LAN and WLAN interfaces.

Internal host/gateway interface

There is a special host/gateway logical IP interface within MW1122
called VBRIDGE. This interface has a specific purpose in MW1122.
In applications where some ATM virtual channel connections are used
for bridging IP traffic and some other ATM virtual channel
connections are used for routing IP traffic, the VBRIDGE interface
must be used instead of LAN/WLAN IP addresses. Alternatively, this
interface is used in bridge only application when the IP address is
required for remote management purposes.

Data VCC operation

MW1122 supports the following encapsulations in each ATM data
virtual channel individually:

RFC2684 LLC encapsulation for bridged IP (ETH-LLC)

RFC2684 LLC encapsulation for routed IP (IP-LLC)

RFC2364 Virtual circuit multiplexed PPP over AAL5 (PPP-VC)

RFC2364 Virtual circuit multiplexed PPP over AAL5 used to
tunnel LAN/WLAN/VBRIDGE PPTP packets
(TUNNELED-PPP-VC)

If an IP address is given to a virtual channel interface and bridging is
enabled at that interface, then IP data at that interface is routed and all
other protocols are bridged. The only encapsulation which allows both
bridging and routing simultaneously is ETH-LLC. For example, it is