?Basics
　　ip address ip-address subnet-mask
　　
　　ip default-gateway ip-address
　　
　　
　　
　　hostname string
　　
　　prompt string
　　
　　?CDP
　　Default CDP Configuration
　　
　　CDP global state Enabled
　　
　　CDP interface state Enabled
　　
　　CDP timer (packet update frequency) 60 seconds
　　
　　CDP holdtime (before discarding) 180 seconds
　　
　　CDP version-2 advertisements Enabled
　　
　　
　　
　　cdp timer seconds (Optional)
　　
　　Set the transmission frequency of CDP updates in seconds.
　　
　　The range is from 5 to 254; the default is 60 seconds.
　　
　　
　　
　　cdp holdtime seconds (Optional)
　　
　　Specify the amount of time a receiving device should hold the information sent by
　　
　　your device before discarding it.
　　
　　The range is from 10 to 255 seconds; the default is 180 seconds.
　　
　　
　　
　　cdp advertise-v2 (Optional)
　　
　　Configure CDP to send version-2 advertisements. This is the default state.
　　
　　?DNS
　　ip name-server server-address1
　　
　　ip domain-name name
　　
　　ip domain-lookup
　　
　　?SNMP
　　snmp-server host host-addr {traps informs} {version {1 2c}} community-string notification-type
　　
　　recipient of the trap message.
　　
　　
　　
　　snmp-server enable traps mac-notification
　　
　　send MAC address traps to
　　
　　
　　
　　snmp-server enable traps mac-notification
　　
　　Enable the switch to send MAC address traps
　　
　　
　　
　　mac-address-table notification
　　
　　Enable the MAC address notification feature.
　　
　　
　　
　　mac-address-table notification [interval value] [history-size value]
　　
　　Enter the trap interval time and the history table size.
　　
　　
　　
　　snmp trap mac-notification {added removed}
　　
　　Enable the MAC address notification trap.
　　
　　
　　
　　Switch(config)# snmp-server host 172.20.10.10 traps private
　　
　　Switch(config)# snmp-server enable traps mac-notification
　　
　　Switch(config)# mac-address-table notification
　　
　　Switch(config)# mac-address-table notification interval 60
　　
　　Switch(config)# mac-address-table notification history-size 100
　　
　　Switch(config)# interface fastethernet0/4
　　
　　Switch(config-if)# snmp trap mac-notification added
　　
　　
　　
　　mac-address-table static mac-addr vlan vlan-id interface interface-id
　　
　　Add a static address to the MAC address table.
　　
　　
　　
　　show mac-address-table address
　　
　　Displays MAC address table information for the specified MAC address.
　　
　　
　　
　　show mac-address-table aging-time
　　
　　Displays the aging time in all VLANs or the specified VLAN.
　　
　　
　　
　　show mac-address-table count
　　
　　Displays the number of addresses present in all VLANs or the specified VLAN.
　　
　　
　　
　　show mac-address-table dynamic
　　
　　Displays dynamic MAC address table entries only.
　　
　　
　　
　　show mac-address-table interface
　　
　　Displays the MAC address table information for the specified interface.
　　
　　
　　
　　show mac-address-table multicast
　　
　　Displays the Layer 2 multicast entries for all VLANs or the specified VLAN.
　　
　　
　　
　　show mac-address-table static
　　
　　Displays static MAC address table entries only.
　　
　　
　　
　　show mac-address-table vlan
　　
　　Displays the MAC address table information for the specified VLAN.
　　
　　
　　
　　snmp-server community private RW
　　
　　snmp-server community public RO
　　
　　snmp-server community private@es0 RW
　　
　　snmp-server community public@es0 RO
　　
　　snmp-server chassis-id 0x12
　　
　　?NTP
　　Configure the switch to synchronize only to devices providing authentication key 42
　　
　　in the device抯 NTP packets:
　　
　　Switch(config)# ntp authenticate
　　
　　Switch(config)# ntp authentication-key 42 md5 aNiceKey
　　
　　Switch(config)# ntp trusted-key 42
　　
　　
　　
　　An NTP association can be a peer association (this switch can either synchronize to
　　
　　the other device or allow the other device to synchronize to it), or it can be a
　　
　　server association (meaning that only this switch synchronizes to the other device,
　　
　　and not the other way around).
　　
　　
　　
　　ntp peer ip-address [version number] [key keyid] [source interface] [prefer]
　　
　　ntp server ip-address [version number] [key keyid] [source interface] [prefer]
　　
　　
　　
　　ntp broadcast client
　　
　　ntp broadcastdelay microseconds
　　
　　ntp broadcast [version number] [key keyid] [destination-address]
　　
　　
　　
　　ntp Access-group {query-only serve-only serve peer} access-list-number
　　
　　
　　
　　NTP services are enabled on all interfaces by default.
　　
　　ntp disable
　　
　　ntp source type number
　　
　　?SDM
　　By using Switch Database Management (SDM) templates, you can configure memory
　　
　　resources in the switch to optimize support for specific features, depending on how
　　
　　the switch is used in your network.
　　
　　
　　
　　The four templates prioritize system memory to optimize support for these types of features:
　　
　　
　　
　　?QoS and security ACEs桾he access template might typically be used in an access switch at the network edge where the route table sizes might not be substantial. Filtering and QoS might be more important because an access
　　
　　switch is the entry to the whole network.
　　
　　
　　
　　?Routing桾he routing template maximizes system resources for unicast routing,
　　
　　typically required for a router or aggregator in the center of a network.
　　
　　
　　
　　?VLANs桾he VLAN template disables routing and supports the maximum number of
　　
　　unicast MAC addresses. It would typically be selected for a Catalyst 3550
　　
　　used as a Layer 2 switch.
　　
　　
　　
　　?Default桾he default template gives balance to all functionalities (QoS, ACLs,
　　
　　unicast routing, multicast routing, VLANs and MAC addresses).
　　
　　
　　
　　sdm prefer {access routing vlan}
　　
　　1.1. Vlan's
　　?Normal VLAN's
　　To configure normal-range VLANs (VLAN IDs 1 to 1005), use the vlan vlan-id global
　　
　　configuration command to enter config-vlan mode or the vlan database
　　
　　privileged EXEC command to enter VLAN configuration mode.
　　
　　
　　
　　Add ports to a VLAN by using the switchport interface configuration commands:
　　
　　
　　
　　Normal-range VLANs are identified with a number between 1 and 1001.
　　
　　
　　
　　vlan database
　　
　　vlan vlan-id name vlan-name
　　
　　
　　
　　Assign a port to a VLAN in the VLAN
　　
　　interface interface-id
　　
　　switchport mode access
　　
　　switchport access vlan vlan-id
　　
　　?Extended VLAN's
　　The VLAN configurations for VLAN IDs 1 to 1005 are saved in the VLAN database.
　　
　　To configure extended-range VLANs (VLAN IDs 1006 to 4094), you must use config-vlan
　　
　　mode with V