Configuring Bridging, 16-2 | Cisco Systems 15310-MA, 15310-CL

Chapter 16 Configuring Bridging on the ML-Series Card

Configuring Bridging

If the destination address of the packet is known in the bridge table, the packet is forwarded on a single interface in the bridge group. If the packet’s destination is unknown in the bridge table, the packet is flooded on all forwarding interfaces in the bridge group. The bridge places source addresses in the bridge table as it learns them during the process of bridging.

Spanning tree is not mandatory for an ML-Series card bridge group, but if it is configured, a separate spanning-tree process runs for each configured bridge group. A bridge group establishes a spanning tree based on the bridge protocol data units (BPDUs) it receives on only its member interfaces.

Configuring Bridging

Beginning in global configuration mode, use the following steps to configure bridging:

	Command	Purpose
Step 1
Step 1	ML_Series(config)# no ip	Enables bridging of IP packets. This command needs to be
	routing	executed once per card, not once per bridge-group. This step is
		not done for IRB.
Step 2
Step 2	ML_Series(config)# bridge	Assigns a bridge group number and defines the appropriate
	bridge-group-number [protocol	spanning-tree type:
	{drpi-rstp rstp ieee}]	• drpri-rstpis the protocol used to interconnect dual resilient

		packet ring (RPR) to protect from node failure. Do not
		configure this option on the ONS 15310-CL or
		ONS 15310-MA ML-Series.
		• rstp is the IEEE 802.1W Rapid Spanning Tree.
		• ieee is the IEEE 802.1D Spanning Tree Protocol.
		Note Spanning tree is not mandatory for an ML-Series card
		bridge group, but configuring spanning tree blocks
		network loops.
Step 3
Step 3	ML_Series(config)# bridge	(Optional) Assigns a specific priority to the bridge, to assist in
	bridge-group-number priority	the spanning-tree root definition. Lowering the priority of a
	number	bridge makes it more likely that the bridge is selected as the root.

Step 4
Step 4	ML_Series(config)# interface	Enters interface configuration mode to configure the interface of
	type number	the ML-Series card.
Step 5
Step 5	ML_Series(config-if)#	Assigns a network interface to a bridge group.
	bridge-group
	bridge-group-number
Step 6
Step 6	ML_Series(config-if)# no	Changes the shutdown state to up and enables the interface.
	shutdown
Step 7
Step 7	ML_Series(config-if)# end	Returns to privileged EXEC mode.
Step 8
Step 8	ML_Series# copy running-config	(Optional) Saves your entries in the configuration file.
	startup-config

Figure 16-1shows a bridging example. Example 16-1shows the code used to configure ML-Series A. Example 16-2shows the code used to configure ML-Series B.

Cisco ONS 15310-CL and Cisco ONS 15310-MA Ethernet Card Software Feature and Configuration Guide R8.5

16-2	78-18133-01

15310-CL, 15310-MA specifications

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Cisco Systems 15310-MA, 15310-CL manual Configuring Bridging, 16-2

Models: 15310-CL 15310-MA

Configuring Bridging

Command

(Optional) Saves your entries in the configuration file.

Figure 16-1shows a bridging example. Example 16-1shows the code used to configure ML-Series A. Example 16-2shows the code used to configure ML-Series B.

16-2

15310-CL, 15310-MA specifications