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Configuring the Cisco Gigabit EtherSwitch EHWIC
How to Configure Gigabit EtherSwitch EHWICs
33
Configuring the Cisco Gigabit EtherSwitch EHWIC
OL-23155-01
Assigning Long Port Cost Values
You can manually assign long port costs in the range of 1 to 200,000,000. Table 4 lists the recommended
cost values.
Verifying Spanning Tree Port Cost
Use the show spanning-tree vlan command to verify the spanning-tree port cost configuration.
Router#show spanning-tree vlan 200
Port 264 (GigabitEthernet0/1/2) of VLAN200 is forwarding
Port path cost 17, Port priority 64, Port Identifier 129.8.
Designated root has priority 32768, address 0010.0d40.34c7
Designated bridge has priority 32768, address 0010.0d40.34c7
Designated port id is 128.1, designated path cost 0
Timers: message age 2, forward delay 0, hold 0
Number of transitions to forwarding state: 1
BPDU: sent 0, received 13513
Router#
Configuring the Bridge Priority of a VLAN
To configure the spanning tree bridge priority of a VLAN, use the spanning-tree vlan vlan_ID priority
bridge_priority command in global configuration mode. The bridge_priority value can be from 1 to
65535.
Use the no form of this command to restore the defaults.
Router(config)#spanning-tree vlan 1 priority 25
Caution Exercise care when using this command. For most situations, the spanning-tree vlan vlan_ID root
primary command and the spanning-tree vlan vlan_ID root secondary command are the preferred
commands to modify the bridge priority.
Verifying the Bridge Priority of a VLAN
Use the show spanning-tree vlan bridge command to verify the bridge priority, as illustrated below:
Router#show spanning-tree vlan 200 bridge brief
Hello Max Fwd
Vlan Bridge ID Time Age Delay Protocol
---------------- -------------------- ---- ---- ----- --------
VLAN200 33792 0050.3e8d.64c8 2 20 15 ieee
Router#
Table 4 Recommended Long Port Cost Values
Port Speed Recommended Value Recommended Range
10 Mbps 2,000,000 200,000 to 20,000,000
100 Mbps 200,000 20,000 to 2,000,000
1000 Mbps 20,000 2,000 to 200,000
- Contents 1
- Configuring VLANs 4
- Verifying VLAN Deletion 7
- Configuring a VTP Server 8
- Configuring a VTP Client 9
- Verifying VTP 10
- Defining a Range Macro 11
- DETAILED STEPS 12
- SUMMARY STEPS 13
- Example: 18
- OL-23155-01 19
- Changing the Quiet Period 24
- Enabling Multiple Hosts 27
- Configuring Spanning Tree 29
- Enabling Spanning Tree 30
- Calculating Port Cost 32
- Configuring the Hello Time 34
- Configuring the Root Bridge 34
- Disabling Spanning Tree 35
- Configuring the Aging Timer 37
- Verifying the Aging Time 38
- Configuring the SPAN Sources 39
- Configuring SPAN Destinations 39
- Verifying the SPAN Session 39
- Configuring IGMP Snooping 45
- Configuring Fallback Bridging 52
- Creating a Bridge Group 53
- Changing the Switch Priority 58
- Assigning a Path Cost 59
- Adjusting BPDU Intervals 60
- Voice Traffic and VVID 66
- Adding Trap Managers 68
- Configuring IP Information 69
- Managing the ARP Table 73
- Configuring the Aging Time 74
- Removing Dynamic Addresses 75
- Adding Secure Addresses 76
- Configuring Static Addresses 77
- Clearing MAC Address Tables 78
- Configuring Port Security 78
- Range of Interface: Examples 79
- VLAN Configuration: Example 80
- Spanning Tree: Examples 81
- Hello Time: Example 82
- Spanning Tree Root: Example 83
- IGMP Snooping: Example 84
- Storm-Control: Example 86
- Ethernet Switching: Examples 86
- Inter-VLAN Routing: Example 87
- Additional References 88
- Technical Assistance 89
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