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Configuring the Cisco Gigabit EtherSwitch EHWIC
How to Configure Gigabit EtherSwitch EHWICs
74
Configuring the Cisco Gigabit EtherSwitch EHWIC
OL-23155-01
Understanding MAC Addresses and VLANs
All addresses are associated with a VLAN. An address can exist in more than one VLAN and have
different destinations in each. Multicast addresses, for example, could be forwarded to port 1 in VLAN
1 and ports 9, 10, and 11 in VLAN 5.
Each VLAN maintains its own logical address table. A known address in one VLAN is unknown in
another until it is learned or statically associated with a port in the other VLAN. An address can be secure
in one VLAN and dynamic in another. Addresses that are statically entered in one VLAN must be static
addresses in all other VLANs.
Changing the Address Aging Time
Dynamic addresses are source MAC addresses that the switch learns and then drops when they are not
in use. Use the Aging Time field to define how long the switch retains unseen addresses in the table. This
parameter applies to all VLANs.
Configuring the Aging Time
Setting too short an aging time can cause addresses to be prematurely removed from the table. When the
switch receives a packet for an unknown destination, it floods the packet to all ports in the same VLAN
as the receiving port. This unnecessary flooding can impact performance. Setting too long an aging time
can cause the address table to be filled with unused addresses; it can cause delays in establishing
connectivity when a workstation is moved to a new port.
The aging timer may be configured from 10 to 630 seconds, in 10-second intervals.
Beginning in global configuration mode, follow these steps to configure the dynamic address table aging
time.
SUMMARY STEPS
1. configure terminal
2. mac-address-table aging-time seconds
3. end
DETAILED STEPS
Command Purpose
Step 1
configure terminal
Example:
Router(config)#configure terminal
Enters global configuration mode.
- 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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