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Cisco Systems OL-4580-01 manual Configuring the DHCP Relay Agent

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Chapter 8 Configuring the DHCP Relay Agent

Displaying the DHCP Relay Configuration

	Cisco Content Services Switch Routing and Bridging Configuration Guide
8-6	OL-4580-01

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Cisco Systems OL-4580-01 manual Configuring the DHCP Relay Agent, Displaying the DHCP Relay Configuration

Contents

Cisco Content Services Switch Routing and Bridging Configuration GuideSoftware Version January Corporate HeadquartersCopyright 2004, Cisco Systems, Inc. All rights reserved C O N T E N T S PrefaceConfiguring Circuits Configuring Circuit-IP UnreachablesEnabling BPDU Guard Showing Interface InformationConfiguring Router-Discovery Limited-Broadcast Configuring Spanning-Tree Bridge Aging-TimeConfiguring Spanning-Tree Bridge Priority Configuring Spanning -Tree Bridging for the CSSStub Area OSPF OverviewAreas Setting the Retransmission Interval Showing the Configured Advertised ASE RoutesShowing Summary Route Configuration Information OSPF Configuration in a Startup-Configuration FileConfiguring Routing Information Protocol Configuring the Internet ProtocolContents Configuring an IP Source RouteSetting the CDP Hold Time Configuring the Cisco Discovery ProtocolConfiguring the DHCP Relay Agent ContentsContents OL-4580-01Interface Trunking Between VLANs F I G U R E SCSS Interfaces and Circuits Example of SPAN ConnectivityFigures OL-4580-01Field Description for the show bridge port-fast Command Global OSPF Configuration Quick StartInterface and Circuit Configuration Quick Start Field Descriptions for the show circuits CommandIP Configuration Quick Start Field Descriptions for the show ospf ase CommandField Descriptions for the show ospf redistribute Command RIP Configuration Quick StartPreface Audience How to Use This Guide Related DocumentationSymbols and Conventions Obtaining Documentation Documentation Feedback Obtaining Technical AssistanceHow to Use This Guide AudienceChapter 1, Configuring Configure the CSS interface ports and circuits forRelated Documentation Chapter 7, ConfiguringConfigure Cisco Discovery Protocol CDP Chapter 8, Configuringxviii Document TitleDescription Document Title DescriptionSymbols and Conventions Ordering Documentation Obtaining DocumentationCisco.com Documentation Feedback Obtaining Technical AssistanceCisco Technical Support Website http//tools.cisco.com/RPF/register/register.doxxiii Opening a TAC CaseTAC Case Priority Definitions xxiv Obtaining Additional Publications and Informationhttp//cisco.com/univercd/cc/td/doc/pcat Internet Protocol Journal is a quarterly journal published by Cisco Systems for engineering professionals involved in designing, developing, and operating public and private internets and intranets. You can access the Internet Protocol Journal at this URL OL-4580-01 xxviPreface Obtaining Additional Publications and Information Interface and Circuit Overview Configuring Interfaces and CircuitsInterface and Circuit Overview Configuring Interfaces Configuring Circuits Configuring RIP for an IP InterfaceFor an 802.1Q trunk, you can use the default-vlan command to Trunk Figure 1-1 CSS Interfaces and CircuitsFigure 1-2 Interface Trunking Between VLANs Interface and Circuit Configuration Quick Start Task and Command ExampleTask and Command Example 8. Optional Display the interface configurationConfiguring Interfaces Configuring an Interface Entering a Description for the InterfaceConfiguring Interface Duplex and Speed Setting Interface Maximum Idle Time Bridging an Interface to a VLANConfiguring an Interface Entering a Description for the InterfaceConfiguring Interface Duplex and Speed Use the phy command to configure the duplex, speed Fast Ethernet ports only, and flow control Gigabit Ethernet ports only for the interface ports, as follows Setting Interface Maximum Idle Time 1-101-11 Bridging an Interface to a VLANSpecifying VLAN Trunking for an Interface 1-12 Chapter 1 Configuring Interfaces and Circuits Configuring Interfacesconfig-trunkif2/3# no trunk 1-13 Selecting a Default VLAN in a Trunkconfig-if-vlan1/1-3# no default-vlan Configuring Spanning-Tree Bridging for a VLAN or a Trunked Interface Configuring Spanning-Tree Bridge PathcostConfiguring Spanning-Tree Bridge Port Priority Configuring Spanning-Tree Bridge State1-15 Configuring Spanning-Tree Bridge PathcostConfiguring Spanning-Tree Bridge Port Priority Configuring Port Fast on an Interface Configuring Spanning-Tree Bridge StateEnabling Port Fast Enabling BPDU Guard Showing Port Fast Information 1-16Enabling Port Fast Enabling BPDU Guardconfig-if2/1# bridge port-fast enable config-if2/1# bridge port-fast disableShowing Port Fast Information disabled commandField DescriptionShowing Interface Configurations Showing Bridge ConfigurationsShowing Bridge Configurations Showing Trunking Configurations Showing Interface Statistics Showing Ethernet Interface ErrorsField DescriptionField DescriptionCommand continued FieldDescription 1-21Showing Trunking Configurations Showing Interface InformationField DescriptionShowing Interface Duplex and Speed Table 1-6 Field Descriptions for the show interface CommandField DescriptionShowing Interface Statistics Table 1-7 Field Descriptions for the show phy CommandField DescriptionTable 1-8 describes the fields in the show mibii command output FieldDescription 1-25Table 1-8 Field Descriptions for the show mibii Command continued FieldDescription 1-26Showing Ethernet Interface Errors FieldDescription 1-271-28 FieldDescription Shutting Down an Interface Shutting Down All Interfacesconfig-ife3# admin-shutdown config-ife3# shut1-30 Restarting an InterfaceRestarting All Interfaces Configuring Circuits Entering Circuit Configuration ModeConfiguring a Circuit IP Interface Entering Circuit Configuration Mode1-32 Configuring a Circuit IP AddressConfiguring a Circuit-IP Broadcast Address Configuring Circuit-IP Redirects Configuring Circuit-IP UnreachablesConfiguring Router-Discovery Preference for a Circuit IP Interface config-circuit-ipVLAN7-172.16.6.58# no redirects1-34 Enabling and Disabling a Circuit IPConfiguring Router-Discovery Protocol Settings for a Circuit Configuring the Router-Discovery Lifetime Configuring Router-Discovery Limited-BroadcastConfiguring the Router-Discovery Lifetime Configuring Router-Discovery Limited-BroadcastConfiguring the Router-Discovery Max-Advertisement-Interval Configuring the Router-Discovery Min-Advertisement-Intervalconfig-circuitVLAN7# router-discovery max-advertisement-interval 300 config-circuitVLAN7# router-discovery min-advertisement-interval 100Showing Circuits Table 1-10 Field Descriptions for the show circuits CommandField DescriptionShowing IP Interfaces Table 1-11 Field Descriptions for the show ip interfaces CommandField DescriptionConfiguring RIP for an IP Interface Enabling RIP on an IP InterfaceEnabling RIP on an IP Interface Configuring a RIP Default Route Configuring a RIP Receive Version Configuring RIP Send VersionConfiguring a RIP Default Route Configuring a RIP Receive VersionConfiguring RIP Send Version config-circuit-ipVLAN7-192.168.1.58# rip default-route1-41 Configuring RIP Packet LoggingShowing RIP Configurations for IP Addresses Table 1-12 Field Descriptions for the show rip Command FieldDescription 1-42Field DescriptionField DescriptionConfiguring the Switched Port Analyzer Feature 1-441-45 Figure 1-3 Example of SPAN ConnectivitySSPAN Rx SSPAN TxConfiguring SPAN on a CSS Configuring SPAN on a CSS Verifying the SPAN Configuration on a CSSsetspan srcport number destport number copyBothcopyTxOnlycopyRxOnly 1-46Verifying the SPAN Configuration on a CSS FieldDescription 1-47Table 1-15 Field Descriptions for the show setspan Command continued FieldDescription 1-48Configuring Spanning-Tree Bridging for the CSS C H A P T E RCSS Spanning-Tree Bridging Quick Start Configuring Spanning-Tree Bridge Aging-TimeConfiguring Spanning-Tree Bridge Forward-Time Configuring Spanning-Tree Bridge Hello-TimeTable 2-1 Spanning-Tree Bridging Configuration Quick Start continued Configuring Spanning-Tree Bridge Aging-TimeTask and Command Example Configuring Spanning-Tree Bridge Forward-Time Configuring Spanning-Tree Bridge Hello-TimeConfiguring Spanning-Tree Bridge Max-Age Configuring Spanning-Tree Bridge Priority Disabling Bridge Spanning-TreeShowing Bridge Configurations FieldDescription FieldField DescriptionOL-4580-01 Chapter 2 Configuring Spanning-Tree Bridging for the CSSShowing Bridge Configurations Configuring Open Shortest Path First OSPF OSPF Overview CSS OSPF Configuration Quick StartConfiguring OSPF on the CSS Configuring OSPF on a CSS IP Interface OSPF Configuration in a Startup-Configuration FileOSPF Overview OSPF Routing Hierarchy Link-State DatabasesOSPF Routing Hierarchy Backbone Area Autonomous SystemAreas Autonomous System Boundary Routers Area Border RoutersStub Area Link-State Databases CSS OSPF Configuration Quick Start Global OSPF Configuration Quick StartGlobal OSPF Configuration Quick Start OSPF IP Interface Configuration Quick StartTask and Command Example Table 3-1 Global OSPF Configuration Quick Startconfig ospf router-id config ospf areaOSPF IP Interface Configuration Quick Start Task and Command ExampleTask and Command Example config-circuitVLAN6# ip address 3.1.2.2/24config-circuit-ipVLAN6-3.1.2.2# ospf config-circuit-ipVLAN6-3.1.2.2 ospf areaVerifying Your Configuration 3-11Configuring OSPF on the CSS Configuring the OSPF Router IDConfiguring the OSPF Router ID Enabling OSPF Configuring an Area Configuring Equal-Cost Routes Configuring Summarized Routes at an ABR3-13 Configuring an AreaEnabling OSPF Configuring Equal-Cost Routes Configuring Summarized Routes at an ABRRemoving an Area 3-14Configuring the CSS as an Autonomous System Boundary Router config# no ospf enable config# ospf range 0.1.0.1 192.168.0.0config# no ospf range 0.1.0.1 192.168.0.0 config# ospf range 0.1.0.1 192.168.0.0 255.255.0.0 blockAdvertising a Route as an OSPF ASE Route Advertising a Default ASE Route Advertising Other Routes Through OSPFAdvertising a Route as an OSPF ASE Route 3-16Chapter 3 Configuring Open Shortest Path First OSPF Configuring OSPF on the CSS3-17 OL-4580-01Chapter 3 Configuring Open Shortest Path First OSPF Configuring OSPF on the CSSconfig# ospf advertise 192.168.44.0 3-183-19 config# no ospf advertiseconfig# ospf advertise 193.23.44.0 255.255.255.0 metric 3 type1 3-20 Advertising a Default ASE Routeconfig# ospf default Advertising Other Routes Through OSPF config# ospf default metric 10 type1config# no ospf default config# ospf redistribute firewallConfiguring OSPF on a CSS IP Interface Configuring the CSS IP Interface as an OSPF InterfaceEnabling OSPF on the Interface Configuring the Interface Attributes Assigning an OSPF Area to the InterfaceConfiguring the CSS IP Interface as an OSPF Interface 3-23Configuring the Interface Attributes Assigning an OSPF Area to the InterfaceEnabling OSPF on the Interface Setting the Cost Setting the Dead Router IntervalSetting the Cost Setting the Dead Router IntervalSetting the Hello Packet Interval Setting the Retransmission Interval Setting the Transit-Link Delay3-26 Setting the PasswordSetting the Poll Interval 3-27 Setting the Priority of the CSSSetting the Retransmission Interval Setting the Transit-Link Delay Showing OSPF InformationShowing ASE Entries Showing the Configured Advertised ASE Routes Showing Summary Route Configuration InformationShowing OSPF Area Information Showing Global StatisticsField DescriptionShowing IP Interface Information FieldDescription Field3-31 FieldDescription 3-32 FieldDescription Showing Link-State Databases FieldDescription 3-33Table 3-6 Field Descriptions for the show ospf lsdb Command FieldDescription 3-34Field DescriptionADV Router 3-35Showing ASE Entries show ospf asegrepField DescriptionShowing the Configured Advertised ASE Routes Table 3-8 Field Descriptions for the show ospf advertise CommandField DescriptionShowing the Redistribution Policy Firewall FieldDescription 3-38Showing Summary Route Configuration Information Showing OSPF NeighborsField DescriptionField DescriptionAddress 3-403-41 FieldDescription 3-42 FieldDescription OSPF Configuration in a Startup-Configuration File Chapter 3 Configuring Open Shortest Path First OSPFOSPF Configuration in a Startup-Configuration File GLOBAL ospf router-id 121.23.21.1 ospf enableChapter 3 Configuring Open Shortest Path First OSPF OSPF Configuration in a Startup-Configuration File3-44 OL-4580-01Configuring the Address Resolution ProtocolARP Configuration Quick Start Configuring ARP Mapping Configuring ARP Timeout Configuring ARP Wait Updating ARP ParametersTable 4-1 ARP Configuration Quick Start ARP Configuration Quick StartTask and Command Example Configuring ARP Mapping arp iporhost macaddress interface vlanConfiguring ARP Timeout Configuring ARP WaitUpdating ARP Parameters Clearing ARP ParametersShowing ARP Information show arp configfilemanagement-portsummaryiporhostTable 4-2 Field Descriptions for the show arp Command Table 4-3 Field Descriptions for the show arp summary CommandField DescriptionTable 4-4 Field Descriptions for the show arp config Command Table 4-5 Field Descriptions for the show arp management-port Command# show arp config FieldChapter 4 Configuring the Address Resolution Protocol Showing ARP Information# show arp # show arp fileChapter 4 Configuring the Address Resolution Protocol 4-10Showing ARP Information OL-4580-01Configuring Routing Information Protocol RIP Configuration Quick Start Configuring RIP AdvertiseConfiguring RIP Redistribute Configuring Equal-Cost RIP Routes Showing RIP ConfigurationsTable 5-1 RIP Configuration Quick Start RIP Configuration Quick StartTask and Command Example rip redistribute firewalllocalospfstatic metric Configuring RIP AdvertiseConfiguring RIP Redistribute Configuring Equal-Cost RIP Routes Showing RIP Configurations Table 5-2 Field Descriptions for the show rip CommandField DescriptionTable 5-2 Field Descriptions for the show rip Command continued Table 5-3 Field Descriptions for the show rip globals CommandField DescriptionDescription Table 5-4 Field Descriptions for the show rip statistics CommandField OL-4580-01 Chapter 5 Configuring Routing Information ProtocolShowing RIP Configurations Configuring the Internet Protocol IP Configuration Quick Start Configuring an IP RouteDisabling an Implicit Service for the Static Route Next Hop Configuring an IP Source Route Configuring the IP Record RouteTable 6-1 IP Configuration Quick Start IP Configuration Quick StartTask and Command Example Configuring an IP Route ip no-implicit-service ip redundancyPage 0.0.0.0 /0 and a next hop address of 192.167.1.1, enter Disabling an Implicit Service for the Static Route Next Hop Configuring an IP Source Route Configuring the IP Record Routeconfig# ip source-route config# no ip source-routeip ecmp addressno-prefer-ingressroundrobin Configuring Box-to-Box RedundancyConfiguring IP Equal-Cost Multipath Forwarding IP Subnet Broadcast Addressed Frames ip subnet-broadcast command6-10 Configuring IP Unconditional BridgingConfiguring IP Opportunistic Layer 3 Forwarding Internet Router1 default Subnet CSS 6-11Figure 6-1 Example of Opportunistic Layer 3 Forwarding VLAN1 End Station AShowing IP Configuration Information Showing IP Global Configuration ParametersShowing IP Interface Information Showing IP Routing Information Showing IP Statistics Showing a Summary of IP Global StatisticsShowing IP Global Configuration Parameters Table 6-2 Field Descriptions for the show ip config CommandField DescriptionTable 6-3 Field Descriptions for the show ip interfaces Command Showing IP Interface InformationField DescriptionShowing IP Routing Information FieldDescription 6-15Showing IP Statistics FieldDescription FieldField Description6-17 TCP StatisticsField Description6-18 ICMP StatisticsField Description6-19 ARP StatisticsResetting IP Statistics Showing a Summary of IP Global StatisticsField DescriptionField DescriptionTotal Hosts 6-21Chapter 6 Configuring the Internet Protocol Showing IP Configuration Information6-22 OL-4580-01Configuring the Cisco Discovery Protocol C H A P T E RCDP Configuration Quick Start CDP Configuration Quick Start Enabling CDP Setting the CDP Hold TimeSetting the CDP Transmission Rate Showing CDP Information Task and Command Examplecdp holdTime 255 cdp timer Setting the CDP Hold TimeEnabling CDP Setting the CDP Transmission Rate Showing CDP Informationconfig# show cdp Global CDP information Sending CDP packets every 60 secondsConfiguring the DHCP Relay Agent DHCP Relay Agent Configuration Quick StartDisplaying the DHCP Relay Configuration C H A P T E RTable 8-1 DHCP Relay Agent Configuration Quick Start DHCP Relay Agent Configuration Quick StartTask and Command Example Adding a DHCP Destination on a Circuit Enabling and Disabling DHCP on the CircuitDisplaying the DHCP Relay Configuration Defining the Hops Field Value for Forwarding DHCP MessagesField DescriptionField DescriptionOL-4580-01 Chapter 8 Configuring the DHCP Relay AgentDisplaying the DHCP Relay Configuration I N D E IN-13-12 IN-22-2, 4-2, 5-2, 6-2 IN-3 IN-4 IN-5 IN-6 IN-7 IN-8 OL-4580-01 IN-9Index OL-4580-01 IN-10Index