16-2 Smart Switch 1800 4. 0 User Guide , Rev 0 1
Incoming LLC2 traffic that is destined for a terminated MAC address will be for-
warded to the node's internal LLC2 processes. Non-terminated LLC2 frames and all
other frames will be forwarded to the bridge.
Under the spanning tree concept, bridges automatically maintain for warding tables via
exchan ge of messa ges wi th ot her b ridges on th e net work, a nd de termin ation of s ingle
paths for traffic between endpoints (assuming there are multiple possible paths).
Each Bridge is identified by a Bridge ID, which is made up of a two-octet Bridge Pri-
ority—configured in Bridge Node Defaults —f ollow ed by a un ique 4 8-bi t ID ( which
is created automatically by the software).
Bridging is supported on Ethernet, Token Ring, and frame relay interfaces.
The interfaces used for Bridging in the SmartSwitch 1800 are the same as
those used for LLC2. When referring to Bridging, however, these inter-
faces will be called "Bridge ports," since the IEEE 802. 1d standard uses the
term "port" to identify a connection to a bridge.
Avoid con figuri ng parallel B ridge/LL C2 frame relay lin ks between two FRMs if one path is in native LLC2 format and the other in some other for mat. Since native LLC2 i nterfaces do not support the spanning tree protocol, a loop can be created, causing a node failure.
Required Configuration
To configure a Bridge in a SmartSwitch 1800, make sure the following are properly
configured:
●Node pa ramet e rs (Chapter 4). This is general configuration that must be done
no matter which protocols will be run in the node.
●Loaded protocols (Chapter 5): Bridging and frame relay.
●LAN port (page 6-5) that will connect to a Local Area Network.
●Frame relay (Chapter 7) port(s) that wil l connect to a n etwor k and/or fr ame relay
PVC.
●Bridge parameters, described later in this chapter.