Bridging Configuration
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OmniAccess 5740 Unified Services Gateway CLI Configuration Guide
Alcatel-Lucent
BRIDGING OVERVIEW
Bridges are link layer devices that analyzes incoming frames, make forwarding
decisions based on information contained in the frames, then forward the frames
toward the destination. In addition to being simple devices, the ability to
transparently forward any upper-layer protocol packets and other traffic between
two or more network is of great significance.
ALCATEL-LUCENT SPECIFIC BRIDGING OVERVIEW
Bridging feature on OmniAccess 5740 USG helps in carrying same VLAN tag
across the interfaces, carrying multiple network protocols data seamlessly and
avoids complexity of a router configuration. MAC Address, VLAN ID and 802.1p
information remain intact while forwarding through WAN interfaces.
• Supports PPP, MLPPP, WAN Ethernet, FR, MLFR, and HDLC interfaces.
• Supports transparent bridging.
• Supports Half Bridging - bridging on WAN interfaces, which terminates on VLAN
interface. VLAN interface does routing from there on.
• Supports MAC based classification and MAC filtering.
• Supports QoS for bridge traffic.
B
RIDGING ACROSS PPP/MLPPP INTERFACE
PPP provides a standard method of transporting multi-protocols over PPP links.
PPP defines a Link Control Protocol and a variety of Network Control Protocol to
carry different network traffic over PPP links.
Bridge Control Protocol (BCP) is a standard way for establishing and configuring
remote bridging for PPP links. It is defined in RFC 3518.
BCP can be configured on PPP and MLPPP. BCP is responsible for configuring,
enabling and disabling the bridge protocol modules on both ends of the PPP link.
This feature will enable OmniAccess 5740 USG to bridge Ethernet (tagged/
untagged) packets from L2/Ethernet interface across PPP/MLPPP interface.
B
RIDGING ACROSS FR INTERFACE
Like PPP, frame relay can also carry bridged traffic. Each frame relay circuit can
carry bridge and routed traffic. Multiple frame relay circuits can carry bridge and
routed traffic through the same physical interface. The mechanism to carry
bridged traffic through frame relay is defined in RFC 1490.
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