CHAPTER
5-1
Cisco ONS 15454 SONET/SDH ML-Series Multilayer Ethernet Card Software Feature and Configuration Guide, R4.0
78-15224-02
5
5
Configuring Bridging
This chapter describes how to configure bridging for the ML-Series card. For more information about
the Cisco IOS commands used in this chapter, refer to the Cisco IOS Command Reference publication.
This chapter includes the following major sections:
• Bridging, page 5-1
• Configuring Bridging Example, page 5-3
• Monitoring and Verifying Bridging, page 5-4
Caution Cisco Inter-Switch Link (ISL) and Cisco Dynamic Trunking Protocol (DTP) are not supported by the
ML-Series, but the ML-Series broadcast forwards these formats. Using ISL or DTP on connecting
devices is not recommended. Some Cisco devices attempt to use ISL or DTP by default.
Bridging
The ML-Series card can be configured to serve as an IP router and a bridge. Cisco IOS software supports
transparent bridging for Fast Ethernet, Gigabit Ethernet, and POS. Cisco IOS software functionality
combines the advantages of a spanning-tree bridge and a router. This combination provides the speed
and protocol transparency of a spanning-tree bridge, along with the functionality, reliability, and security
of a router.
To configure bridging, you must perform the following tasks in the modes indicated:
• In global configuration mode:
–
Enable bridging of IP packets.
–
Select the type of Spanning Tree Protocol.
• In interface configuration mode:
–
Determine which interfaces belong to the same bridge group.
These interfaces become part of the same spanning tree, allowing the ML-Series card to bridge
all nonrouted traffic among the network interfaces comprising the bridge group. Interfaces not
participating in a bridge group cannot forward bridged traffic.
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