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Cisco ONS 15310-CL and Cisco ONS 15310-MA Ethernet Card Software Feature and Configuration Guide R8.5
78-18133-01
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:
Figure 16-1 shows a bridging example. Example 16-1 shows the code used to configure ML-Series A.
Example 16-2 shows the code used to configure ML-Series B.
Command Purpose
Step 1
ML_Series(config)# no ip
routing
Enables bridging of IP packets. This command needs to be
executed once per card, not once per bridge-group. This step is
not done for IRB.
Step 2
ML_Series(config)# bridge
bridge-group-number
[protocol
{drpi-rstp | rstp | ieee}]
Assigns a bridge group number and defines the appropriate
spanning-tree type:
• drpri-rstp is 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
ML_Series(config)# bridge
bridge-group-number
priority
number
(Optional) Assigns a specific priority to the bridge, to assist in
the spanning-tree root definition. Lowering the priority of a
bridge makes it more likely that the bridge is selected as the root.
Step 4
ML_Series(config)# interface
type number
Enters interface configuration mode to configure the interface of
the ML-Series card.
Step 5
ML_Series(config-if)#
bridge-group
bridge-group-number
Assigns a network interface to a bridge group.
Step 6
ML_Series(config-if)# no
shutdown
Changes the shutdown state to up and enables the interface.
Step 7
ML_Series(config-if)# end
Returns to privileged EXEC mode.
Step 8
ML_Series# copy running-config
startup-config
(Optional) Saves your entries in the configuration file.