Asante Technologies IC36240 user manual Establish Address Resolution, Define a Static ARP Cache

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6.2 Establish Address Resolution

A device in the IP can have both a local address (which uniquely identifies the device on its local segment or LAN) and a network address (which identifies the network to which the device belongs). The local address is more properly known as a data link address because it is contained in the data link layer (Layer 2 of the OSI model) part of the packet header and is read by data link devices (bridges and all device interfaces, for example). The more technically inclined will refer to local addresses as MAC addresses, because the Media Access Control (MAC) sub-layer within the data link layer processes addresses for the layer.

To communicate with a device on Ethernet, you first must determine the 48-bit MAC or local data link address of that device. The process of determining the local data link address from an IP address is called address resolution. The IntraCore IC36240 software uses the Address Resolution Protocol (ARP) for address resolution. ARP is used to associate IP addresses with media or MAC addresses. Taking an IP address as input, ARP determines the associated media address.

Once a media or MAC address is determined, the IP address/media address association is stored in an ARP cache for rapid retrieval. Then the IP datagram is encapsulated in a link-layer frame and sent over the network.

6.2.1 Define a Static ARP Cache

ARP provides a dynamic mapping between IP addresses and media addresses. Because most hosts support dynamic address resolution, you generally do not need to specify static ARP cache entries. Completing this task installs a permanent entry in the ARP cache. The entry is used to translate 32-bit IP addresses into 48-bit hardware addresses.

Optionally, you can specify that the software respond to ARP requests as if it was the owner of the specified IP address. You also have the option of specifying an interface when you define ARP entries.

Perform the following task in global configuration mode, to provide static mapping between IP addresses and media addresses.

Command

Purpose

 

 

arp ip-address hardware-address

Globally associate an IP address with a media (hardware)

 

address in the ARP cache.

 

 

arp ip-address hardware-address

Specify that the software respond to ARP requests as if it

[interface ]

was the owner of the specified interface.

 

 

To display the ARP being used on a particular interface, use the show interface in top mode or global configuration mode. Use the show arp command in top or configuration mode to examine the contents of the ARP cache.

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Asante IntraCore IC36240

User’s Manual

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Contents IntraCore IC36240 Series IntraCore IC36240 Layer 2+ Gigabit Ethernet Switch User’s ManualTable of Contents Password Service Password-Encryption Snmp Configuration Commands Trunk Ieee 802.1q Technical Support and Warranty Introduction FeaturesFront and Back Panel Descriptions Package ContentsLED LEDsConsole Interface Management and ConfigurationInstallation Overview Hardware Installation and SetupSafety Overview Environmental Requirements Installing into an Equipment RackRecommended Installation Tools Power RequirementsSFP Mini Gbic Ports Installing the Optional External Power SupplyEquipment Rack Guidelines Connecting to the Network Connecting Power1 10/100/1000BaseT Ports Cabling Procedures Pin Number Pair Number & Wire Colors Gigabit Ethernet Ports Cabling ProceduresAsante IntraCore IC36240 Connecting to a Console Initial Software SetupUser Access Verification Password Connecting to a PCPrivileges Commands Passwords and Privileges CommandsEnable Password Service Password-Encryption PasswordPassword and login Commands Login SecurityConfiguring an IP Address Username CommandSwitchconfig# ip default-gateway Restoring Factory DefaultsSystem Boot Parameters Setting a Default IP Gateway AddressDocument Conventions Understanding the Command Line Interface CLIUser Top User Exec Mode Access Each Command ModeCommand Show ? Purpose Privileged Top Privileged Exec ModeGlobal Configuration Mode Switch# configure Command Exit End Ctrl-Z PurposeSpanning-Tree Configuration Mode Interface Configuration ModeVlan Configuration Mode Advanced Features Supported within the Command ModeSpanning-tree mst configuration Example of Context Sensitive Help Command Help PurposeSwitch# configure ? Checking Command SyntaxKeystrokes/Command Purpose Using CLI Command HistoryUsing the No and Default Forms of Commands Using Command-Line Editing Features and ShortcutsCompleting a Partial Command Name Moving Around on the Command LineKeystrokes Purpose Editing Command Lines That Wrap Deleting Entries Redisplaying the Current Command LineScrolling Down a Line or a Screen Controlling Capitalization Transposing Mistyped CharactersKeystrokes Switch# clock set 092930 28 January Switch# reload cr Managing the System and Configuration FilesSetting the System Clock Switch# clock ?Enabling the System Log Changing the PasswordTesting Connections with Ping Tests Specifying the HostnameSwitch# show running-config Managing Configuration FilesDisplaying the Operating Configuration Configuring from the TerminalNewname# copy running-config startup-config Copying Configuration Files to a Network ServerSwitch# copy startup-config ? Switch# copy running-config Tftp Switch# copy running-configSwitch# copy running-config tftp//192.168.0.1/my-config Switch# copy tftp//192.168.123.59/my-confg running-config Configuring SnmpAuthentication Access ControlSecurity Levels Create or Modify Access Control for Snmp CommunitySupport Establish the Contact and Location of the Snmp Agent Command Purpose Snmp-server community string viewSnmp Configuration Commands Configuring Spanning TreeSpanning-tree mst? Spanning Tree ParametersPort Path Cost Spanning Tree Port ConfigurationRapid Spanning Tree Protocol Rstp Port PriorityEnabling Rapid Spanning Tree Configuring Switch/Bridge PrioritySwitchconfig# spanning-tree priority priority Rapid ConvergenceConfiguring Port Priority Configuring Link TypeConfiguring an Edge Port Configuring Port Path CostMultiple Spanning-Tree MST Vlan Configuring VlanMAC Address Table Switchconfig# mac-address-table aging-timeShow mac-address-table Assign IP Addresses to Switch Configuring IPClass Address or Range Status Define a Static ARP Cache Establish Address ResolutionForwarding Unknown Multicast Packets Configuring IgmpManaging IP Multicast Traffic Igmp OverviewHost-query messages Using Access ListsSwitchconfig-if-veth1#ip igmp query-interval Command Purpose Ip igmp query-max-response-timeUsing a Classification ACL Asante IntraCore IC36240 Create a Standard Access List Create an Expanded Access List Create a MAC Access ListSwitchconfig# mac access-list standard Access-list 101 deny tcp 192.168.123.0 0.0.0.255 ? Access-list 101 ?Access-list 101 deny ? Access-list 101 deny tcp ?Access-list standard ? Creating an Access List with a NameApplying an Access List to an Interface Access-list ?Switchconfig# access-list 110 permit udp any any eq Configuring Common Access ListsAccess-list 101 deny ip any any Creating or Modifying a Vlan Vlan ConfigurationSwitchconfig-vlan#port-member delete eth Switch# show vlanDeleting a Vlan Vlan Port Membership Modes Static AccessTrunk Ieee 802.1q Switchconfig# end Command Purpose Switchconfig# vlan dot1q tag nativePriority Queuing Quality of Service ConfigurationConfiguring Weighted Fair Queuing Monitoring Weighted Fair Queuing ListsMonitoring Priority Queuing Lists Configuring Traffic Shaping for an InterfaceTraffic Shaping Defining the Priority ListGeneric Traffic Shaping Example Configuring Rate LimitConfiguring Traffic Shaping for an Access List Monitoring the Traffic Shaping ConfigurationAsante IntraCore IC36240 Main Configuration Menu Configuring the Switch Using the GUIFront Panel Information Screen Information ScreensGeneral Information Screen Assign IP Addresses to SwitchClass Address or Range Status Individual Port Configuration Screen Port Configuration MenuAsante IntraCore IC36240 Press go Spanning Tree Protocol Configuration STP Port Configuration Global STP Bridge Configuration Snmp Configuration Asante IntraCore IC36240 Address Table Screen Asante IntraCore IC36240 Asante IntraCore IC36240 Vlan Configuration Asante IntraCore IC36240 Click Apply Igmp Configuration Asante IntraCore IC36240 Asante IntraCore IC36240 Web CLI Screen System Clock Menu Save Problem Possible Solutions Appendix a Basic TroubleshootingPerformance Appendix B SpecificationsPhysical Characteristics Environmental RangeStandards Compliance Technical Support and WarrantyFCC Compliance Statement Important Safety Instructions Appendix C FCC Compliance and Warranty StatementsIntraCare Warranty Statement Appendix D Online Warranty Registration Index Access ListIgmp LED Safety Priority Queuing Vlan
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