Cisco 15327 - Manual (Page 98)

6-2
Ethernet Card Software Feature and Configuration Guide, R7.2
Chapter 6 Configuring Bridges
Configuring Basic 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 Basic Bridging
Use the following steps to configure bridging:
Figure 6-1 shows a bridging example. Example 6-1 shows the configuration of ML-Series card A.
Example 6-2 shows the configuration of ML-Series card B.
Command Purpose
Step 1 Router(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 integrated routing and bridging (IRB).
Step 2 Router(config)# bridge
bridge-group-number [protocol
{drpi-rstp | rstp | ieee} ]
Assigns a bridge group number and defines the appropriate
spanning-tree type:
bridge-group-number can range from 1 to 4096.
• drpri-rstp is the protocol used to interconnect dual RPR
interconnect to protect from node failure
• 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 Router(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 the bridge is selected as the root.
Step 4 Router(config)# interface type
number
Enters interface configuration mode to configure the interface of
the ML-Series card.
Step 5 Router(config-if)# bridge-group
bridge-group-number
Assigns a network interface to a bridge group.
Step 6 Router(config-if)# no shutdown Changes the shutdown state to up and enables the interface.
Step 7 Router(config-if)# end Returns to privileged EXEC mode.
Step 8 Router# copy running-config
startup-config
(Optional) Saves your entries in the configuration file.