Configuring ARP Cache Entries | Cabletron Systems SmartSwitch

Chapter 6: IP Routing Configuration Guide

•802.3 SNAP: SNAP IEEE 802.3 encapsulation, in which the type code becomes the frame length for the IEEE 802.2 LLC encapsulation (destination and source Service Access Points, and a control byte)

To configure IP encapsulation, enter one of the following commands in Configure mode.

Configure Ethernet II	interface	create	ip		<InterfaceName> output-mac-
encapsulation.	encapsulation			ethernet_II

Configure 802.3	interface	create	ip		<InterfaceName> output-mac-
SNAP encapsulation.	encapsulation			ethernet_snap

Configuring Address Resolution Protocol (ARP)

The SSR allows you to configure Address Resolution Protocol (ARP) table entries and parameters. ARP is used to associate IP addresses with media or MAC addresses. Taking an IP address as input, ARP determines the associated MAC 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.

Configuring ARP Cache Entries

You can add and delete entries in the ARP cache. To add or delete static ARP entries, enter one of the the following commands in Configure mode:

Add a static ARP entry.	arp	add <host> mac-addr<MAC-addr>
		exit-port <port>

Clear a static ARP entry.	arp	clear <host>

Configuring Proxy ARP

The SSR can be configured for proxy ARP. The SSR uses proxy ARP (as defined in RFC 1027) to help hosts with no knowledge of routing determine the MAC address of hosts on other networks or subnets. Through Proxy ARP, the SSR will respond to ARP requests from a host with a ARP reply packet containing the SSR MAC address. Proxy ARP is enabled by default on the SSR.

To disable proxy ARP, enter the following command in Configure mode:

Disable Proxy ARP on an interface.

ip disable-proxy-arp interface <InterfaceName>all

88	SmartSwitch Router User Reference Manual

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Cabletron Systems SmartSwitch manual Configuring Address Resolution Protocol ARP, Configuring ARP Cache Entries

Contents

SmartSwitch Router User Reference Manual 9032578-04 SmartSwitch Router User Reference Manual Industry Canada Notice Vcci Notice Cabletron SYSTEMS, INC Program License Agreement SmartSwitch Router User Reference Manual SmartSwitch Router User Reference Manual SmartSwitch Router User Reference Manual Cabletron Systems Limited Program License Agreement SmartSwitch Router User Reference Manual Safety Information Laser Radiation and Connectors EC Directive 89/336/EEC EC Directive 73/23/EEC SmartSwitch Router User Reference Manual Contents Hot Swapping Line Cards and Control Modules SmartTRUNK Configuration Guide Creating a non-IP/non-IPX Vlan Vrrp Configuration Guide 127 Multicast Routing Configuration Guide 199 IP Multicast Overview 199 209 Web Hosting Configuration Guide 233 255 QoS Configuration Guide 283 WAN Configuration Guide 315 Contents How to Use This Manual PrefaceAbout This Manual Who Should Read This Manual? Preface Installing and setting up the SSR Managing the SSR using Cabletron’sRelated Documentation For Information About See Preface SmartSwitch Router User Reference Manual Feature Specification SSR Hardware and software specificationsChapter SSR Product Overview IPX RIP, SAP Multicast IGMP, Dvmrp Supported Media Encapsulation Type Supported Routing Protocols Understanding the Command Line Interface Configuring the SmartSwitch RouterRouting Information Protocol RIP Version 1 Basic Line Editing Commands Access ModesCommon CLI key commands Key Sequence Command User Mode Enable Mode Exit Configure Mode Boot Prom Mode Pvst Loading System Images and Configuration Files Disabling a Function or FeatureBoot and System Image Configuration Files Loading System Image Software Ssr# system show version Activating the Configuration Commands in the Scratchpad Loading Boot Prom SoftwareEnter the system image list command to verify the change CLI displays the following message Copying the Configuration to the Startup Configuration FileEnter yes or y to activate the changes Displaying Configuration Changes Managing the SSR Setting SSR Date and Time Setting the SSR NameConfiguring NTP Configuring Snmp Services Configuring the SSR CLIConfiguring DNS Connecting Between the SSR and Other Systems Configuring Logging Monitoring Configuration Task Command Show the SSR login banner Show the type of Power-On Self Test PostShow the configuration changes Reboot Show the status of the switching fabric Hot Swapping Overview Chapter Hot Swapping Line Cards Control ModulesHot Swapping Line Cards Deactivating the Line Card Removing the Line Card Hot Swapping a Secondary Control Module Installing a New Line CardHot Swapping One Type of Line Card With Another Deactivating the Control Module Removing the Control Module Hot Swapping a Switching Fabric Module SSR 8600 only Installing the Control Module SSR-SF-16 Offline Switching Fabric Bridging Overview Chapter Bridging Configuration GuideSpanning Tree Ieee 802.1d Vlan Overview Bridging Modes Flow-Based and Address-Based Port-based VLANs MAC-address-based VLANsProtocol-based VLANs Subnet-based VLANs SSR Vlan Support Multicast-based VLANsPolicy-based VLANs VLANs and the SSR Access Ports and Trunk Ports 802.1Q support Ports, VLANs, and L3 Interfaces Configuring Address-based or Flow-based Bridging Configuring SSR Bridging FunctionsExplicit and Implicit VLANs Configuring Spanning Tree Address-Based Bridge Table Flow-Based Bridge Table Setting the Bridge Priority Adjusting Spanning-Tree ParametersMore ports for a particular Vlan Adjusting Bridge Protocol Data Unit Bpdu Intervals Setting a Port PriorityAssigning Port Costs Defining the Forward Delay Interval Adjusting the Interval between Hello TimesDefining the Maximum Age Configuring a Port or Protocol based Vlan Configuring Vlan Trunk PortsConfiguring VLANs for Bridging Creating a Port or Protocol Based Vlan Configuring Layer-2 Filters Monitoring Bridging Configuration Examples Creating an IP or IPX VlanCreating a non-IP/non-IPX Vlan Show information on MACsPage Chapter SmartTRUNK Configuration Guide Overview Creating a SmartTRUNK Configuring SmartTRUNKsAdd Physical Ports to the SmartTRUNK Monitoring SmartTRUNKs Specify Traffic Distribution Policy Optional Example Configurations St.2 St.4 Router Switch Server SmartTRUNK Configuration Guide Page Chapter Configuration GuideDhcp Overview Configuring Dhcp Configuring an IP Address PoolConfiguring Client Parameters Client Parameters Configuring a Static IP Address Grouping Scopes with a Common Interface Updating the Lease Database Configuring Dhcp Server ParametersMonitoring the Dhcp Server Dhcp Configuration Examples Define Dhcp network parameters for the scope ‘scope1’Define an IP address pool for addresses 10.1.1.10 through Define a static IP address for Configuring Secondary Subnets Secondary Subnets and Directly-Connected Clients Include ‘scope2’ in the superscope ‘super1’ Interacting with Relay Agents Define the address pool for ‘scope1’ Page Chapter IP Routing Configuration Guide IP Routing Overview IP Routing Protocols SSR supports standards-based TCP, UDP, and IPUnicast Routing Protocols Multicast Routing Protocols Configuring IP Interfaces and Parameters Configuring IP Addresses to PortsConfiguring IP Interfaces for a Vlan Specifying Ethernet Encapsulation Method Configuring ARP Cache Entries Configuring Address Resolution Protocol ARPConfiguring Proxy ARP Specifying IP Interfaces for Rarp Configuring Reverse Address Resolution Protocol RarpDefining MAC-to-IP Address Mappings Configuring DNS Parameters Configuring IP Services IcmpMonitoring Rarp Specify ping Configuring Direct Broadcast Configuring IP HelperConfiguring Denial of Service DOS Configuring Router Discovery Monitoring IP Parameters Assigning IP/IPX Interfaces IP Routing Configuration Guide Configuring Vrrp Vrrp Overview Basic Vrrp Configuration BackupConfiguration of Router R1 Following is the configuration file for Router R1 in Figure Configuration for Router R2 Symmetrical ConfigurationFollowing is the configuration file for Router R2 in Figure Master for VRID=1 Master for VRID=2 Backup for VRID=2 Symmetrical Vrrp Configuration Multi-Backup Configuration Configuration of Router R2 Multi-Backup Vrrp Configuration SmartSwitch Router User Reference Manual 101 Virtual Router Default Priority Configured Priority Configuration of Router R3 Additional ConfigurationFollowing is the configuration file for Router R3 in Figure Setting the Advertisement Interval Setting the Backup PrioritySetting Pre-empt Mode Monitoring Vrrp Setting an Authentication KeyIp-redundancy trace Vrrp Configuration Notes Ip-redundancy showVirtual routers Display information about all Specific virtual router SmartSwitch Router User Reference Manual 107 108 Configuring RIP Chapter RIP Configuration GuideRIP Overview Configuring RIP Parameters Configuring RIP InterfacesEnabling and Disabling RIP Set the authentication method Characters Set the authentication methodTo RIP Specify that RIP V2 packets Configuring RIP Route Default-Metric Configuring RIP Route PreferenceMonitoring RIP Configuration Example 114 Ospf Ospf Overview Configuring Ospf Enable OspfDisable Ospf Ospf Multipath Ospf Parameter Default Value Configuring Ospf Interface ParametersOspf Interface Parameters Create an Ospf area Configuring an Ospf AreaAdd an interface to an Ospf area Configuring Ospf Area Parameters Creating Virtual LinksAdd a stub host to an Ospf area Add a network to an Ospf area for Configuring Ospf over Non-Broadcast Multiple Access Create a virtualLink Set virtual link Monitoring Ospf Ospf Configuration Examples Exporting All Interface & Static Routes to Ospf Exporting All RIP, Interface & Static Routes to Ospf Create a Ospf export destination for type-1 routes Create a Ospf export destination for type-2 routesCreate a RIP export source Create a Static export source Create Ospf export source Create a RIP export destinationCreate OSPF-ASE export source R10 Chapter BGP Configuration Guide BGP Overview Basic BGP Tasks SSR BGP Implementation Setting the Autonomous System Number Setting the Router IDConfiguring a BGP Peer Group Ip-router global set autonomous-system num1 loops num2 Where Autonomous-system number Adding and Removing a BGP Peer Using AS-Path Regular ExpressionsStarting BGP 132 AS-Path Regular Expression Examples Using the AS Path Prepend FeatureTo import MCI routes with a preference BGP Configuration Examples Following is an example BGP Peering Session Example AS-1 AS-2 CLI configuration for router SSR1 is as followsPhysical Link Peering Relationship Ibgp Configuration Example CLI configuration for router SSR2 is as followsGated.conf file for router SSR1 is as follows Gated.conf file for router SSR2 is as follows Ibgp Routing Group Example Sample Ibgp Configuration Routing Group Type AS-64801 Following lines in the Cisco router configure Ospf Ibgp Internal Group Example Illustrates a sample Ibgp Internal group configuration Sample Ibgp Configuration Internal Group Type SmartSwitch Router User Reference Manual 143 Configuration for router C1 a Cisco router is as follows Ebgp Multihop Configuration ExampleConfiguration for router C2 a Cisco router is as follows AS-64800 Physical Link CLI configuration for router SSR3 is as follows CLI configuration for router SSR4 is as follows Community Attribute ExampleGated.conf file for router SSR3 is as follows Gated.conf file for router SSR4 is as follows Sample BGP Configuration Specific Community Sample BGP Configuration Well-Known Community , router SSR11 has the following configuration , router SSR13 has the following configuration , router SSR10 has the following configuration , router SSR14 has the following configuration SmartSwitch Router User Reference Manual 153 LocalPref Attribute Example Sample BGP Configuration LocalPref Attribute Multi-Exit Discriminator Attribute Example Sample BGP Configuration MED Attribute Router SSR6 has the following CLI configuration Router SSR8 has the following CLI configuration Ebgp Aggregation ExampleAS-64900 AS-64901 Router SSR9 has the following CLI configuration Route Reflection Example Shows a sample configuration that uses route reflection AS-64902 SmartSwitch Router User Reference Manual 161 162 Chapter Routing Policy Configuration Guide Route Import and Export Policy Overview Preference Defined by CLI Command Default Default Preference ValuesPreference Import Policies Import-Source Export Policies Route-FilterExport-Destination Export-Source Specifying a Route Filter Aggregates and Generates Aggregate-Destination Aggregate-Source Authentication Authentication Methods Configuring Simple Routing Policies Authentication Keys and Key Management Redistributing Static Routes Redistributing Directly Attached Networks Redistributing RIP into Ospf Redistributing Ospf to RIP Redistributing RIP into RIPRedistributing Aggregate Routes Simple Route Redistribution Examples To redistribute aggregateRoutes into Ospf Example 1 Redistribution into RIP Exporting All Static Routes to All RIP Interfaces Exporting a Given Static Route to All RIP InterfacesExample 2 Redistribution into Ospf 176 Configuring Advanced Routing Policies 178 Creating an Export Destination Creating an Export Source Creating an Import Source Creating a Route FilterCreating an Aggregate Route Create a RIP import SmartSwitch Router User Reference Manual 181 Creating an Aggregate Destination Creating an Aggregate SourceExamples of Import Policies Example 1 Importing from RIP R41 184 Example 2 Importing from Ospf 186 R41 Importing a Selected Subset of OSPF-ASE Routes Examples of Export Policies Example 1 Exporting to RIP Ip-router policy create rip-export-source ripExpSrc Exporting a Given Static Route to a Specific RIP Interface Exporting Aggregate-Routes into RIP Ip-router policy create aggr-export-source aggrExpSrc Example 2 Exporting to Ospf SmartSwitch Router User Reference Manual 195 196 SmartSwitch Router User Reference Manual 197 198 IP Multicast Overview Chapter Multicast Routing Configuration GuideIgmp Overview Dvmrp Overview Configuring Igmp Configuring Igmp on an IP InterfaceConfiguring Igmp Query Interval Configuring Igmp Response Wait Time Configuring Per-Interface Control of Igmp Membership Configuring DvmrpStarting and Stopping Dvmrp Configuring Dvmrp Parameters Configuring Dvmrp on an InterfaceConfiguring the Dvmrp Routing Metric Configuring Dvmrp TTL & Scope Configuring a Dvmrp Tunnel Monitoring Igmp & Dvmrp Multicast protocols Igmp Show all interfaces runningShow all multicast routes Page 208 Chapter IP Policy-Based Forwarding Configuration Guide Defining an ACL Profile Configuring IP PoliciesAssociating the Profile with an IP Policy Creating Multi-statement IP Policies Setting Load Distribution for Next-hop Gateways Setting the IP Policy Action Applying an IP Policy to an Interface Checking the Availability of Next-hop Gateways IP Policy Configuration Examples Routing Traffic to Different ISPsAn IP interface Apply a defined IP policy to All IP interfaces on the SSR Using an IP policy to route traffic to two different ISPs Prioritizing Service to Customers Using an IP policy to prioritize service to customers Authenticating Users through a Firewall Using an IP policy to authenticate users through a firewall Firewall Load Balancing Selecting Next Hop Gateway from IP Packet Information Monitoring IP Policies Display information about allIP policies Display statistics about a Ip-policy show interface interface SmartSwitch Router User Reference Manual 221 222 Chapter Network Address Translation Configuration Guide Configuring NAT Setting Inside and Outside Interfaces Setting NAT Rules Managing Dynamic BindingsStatic Dynamic Static Configuration Specify the FTP session timeoutNAT and FTP Monitoring NAT Using Static NAT First step is to create the interfacesNext, define the interfaces to be NAT inside or outside Then, define the NAT static rules Dynamic Configuration Using Dynamic NAT Dynamic NAT with IP Overload PAT Configuration Using Dynamic NAT with IP Overload Dynamic NAT with Outside Interface Redundancy Using Dynamic NAT with Matching Interface Redundancy 232 Chapter Web Hosting Configuration Guide Configuring Load Balancing Load BalancingCreating the Server Group Specifying Load Balancing Policy Optional Setting Server Status Adding Servers to the Load Balancing Group Setting Timeouts for Load Balancing Mappings Allowing Access to Load Balancing ServersLoad Balancing and FTP Configuration Examples Displaying Load Balancing Information Ftp.quick.com Internet Router User Queries 207.135.89.16 10.1.1.1 Ftp.quick..com 10.1.1.2 Virtual IP Address Ranges 207.135.89.16 207.135.89.17 207.135.89.18 Configuring Web Caching Web Caching Creating the Cache Group Specifying the Clients for the Cache Group OptionalRedirected to cache servers Not redirected to cache servers Other Configurations Configuration ExampleBypassing Cache Servers Monitoring Web-Caching Distributing Frequently-Accessed Sites Across Cache ServersProxy Server Redundancy Show caching policy information Show cache server information IPX Routing Overview Chapter IPX Routing Configuration GuideRIP Routing Information Protocol SAP Service Advertising Protocol Creating IPX Interfaces Configuring IPX RIP & SAPIPX Addresses Configuring IPX Interfaces and Parameters Configuring IPX Addresses to PortsConfiguring IPX Interfaces for a Vlan Specifying IPX Encapsulation Method Configuring IPX Routing Configuring Static RoutesEnabling IPX RIP Enabling SAP Controlling Access to IPX Networks Configuring Static SAP Table EntriesCreating an IPX Access Control List Creating an IPX SAP Access Control List Creating an IPX Type 20 Access Control ListCreating an IPX GNS Access Control List Creating an IPX RIP Access Control List Monitoring an IPX Network Adds a SAP access list Adds a GNS access list 254 Chapter Access Control List Configuration Guide ACL Basics Defining Selection Criteria in ACL Rules How ACL Rules are Evaluated Implicit Deny Rule Allowing External Responses to Established TCP Connections Creating and Modifying ACLs Following ACL illustrates this featureEditing ACLs Offline Maintaining ACLs Using the ACL Editor Applying ACLs to Interfaces Using ACLsThese uses of ACLs are described in the following sections Applying ACLs to Services Using ACLs as Profiles SSR Feature ACL Profile Usage Following SSR features use ACL profilesUsing Profile ACLs with the IP Policy Facility Using Profile ACLs with the Traffic Rate Limiting Facility Using Profile ACLs with Dynamic NAT Using Profile ACLs with the Port Mirroring Facility Using Profile ACLs with the Web Caching Facility Redirecting Http Traffic to Cache Servers Enabling ACL Logging Preventing Web Objects From Being Cached Monitoring ACLs 270 Chapter Security Configuration Guide Security Overview Configuring SSR Access Security Configuring Radius Monitoring Radius Configuring TacacsMonitoring Tacacs Configuring Tacacs Plus Monitoring Tacacs Plus Configuring Passwords Layer-2 Security Filters Configuring Layer-2 Address Filters Configuring Layer-2 Port-to-Address Lock Filters Configuring Layer-2 Static Entry Filters Configuring Layer-2 Secure Port FiltersConfigure a source static Configure a destination static Monitoring Layer-2 Security Filters Et.1.1 Et.1.2 Et.1.3 Hub Layer-2 Filter ExamplesStatic Entries Example Port-to-Address Lock Examples Example 2 Secure Ports Layer-3 Access Control Lists ACLs 282 Chapter QoS Configuration Guide QoS & Layer-2/Layer-3/Layer-4 Flow Overview Layer-2 and Layer-3 & Layer-4 Flow Specification Precedence for Layer-3 Flows Traffic Prioritization for Layer-2 Flows Configuring Layer-2 QoSSSR Queuing Policies Configuring IP QoS Policies Traffic Prioritization for Layer-3 & Layer-4 Flows Configuring IPX QoS Policies Setting an IP QoS PolicySetting an IPX QoS Policy Specifying Precedence for an IP QoS Policy Configuring SSR Queueing Policy Allocating Bandwidth for a Weighted-Fair Queuing PolicyToS Rewrite Specifying Precedence for an IPX QoS Policy Configuring ToS Rewrite for IP Packets MBZ Tos-rewrite Monitoring QoS Limiting Traffic RateShow all IP QoS flows Show all IPX QoS flows Example Configuration Define a rate limit profileApply a rate limit profile to an Interface Displaying Rate Limit Information Interface interface 294 Chapter Performance Monitoring Guide Performance Monitoring Overview Show port error statistics Show information about the masterMAC table Show information about a Particular MAC address Show info about multicasts Monitoring Broadcast Traffic Configuring the SSR for Port MirroringOnly IP ACLs can be specified for port mirroring 298 Configuring and Enabling Rmon Rmon Overview Example of Rmon Configuration Commands Rmon Groups Lite Rmon Groups Standard Rmon Groups Professional Rmon Groups Control Tables Using Rmon Configuring Rmon Groups Enabledisable Num status enabledisableString status enabledisable Size owner string status enabledisable Port port owner string status enabledisable Oid type absolutedelta status enabledisableRmon protocol-distribution index index-number Rmon user-history-control index index-number Displaying Rmon Information Rmon CLI Filters Following shows Host table output without a CLI filter 01000CCCCCCC Using Rmon CLI Filters Troubleshooting RmonCreating Rmon CLI Filters 312 Allocating Memory to Rmon Ssr# rmon show status Rmon Status Rmon set memory number WAN WAN Overview Configuring WAN Interfaces Primary and Secondary AddressesStatic, Mapped, and Dynamic Peer IP/IPX Addresses Static Addresses Following command line displays an example for a Vlan Following command line displays two examples for PPPMapped Addresses Dynamic Addresses Forcing Bridged Encapsulation Following command line displays an example for PPPPacket Compression Example Configurations Average Packet SizeNature of the Data Link Integrity WAN Quality of Service Packet Encryption Weighted-Fair Queueing Source Filtering and ACLsCongestion Management Random Early Discard RED Virtual Circuits Frame Relay OverviewAdaptive Shaping Configuring Frame Relay Interfaces for the SSR Permanent Virtual Circuits PVCs Setting up a Frame Relay Service Profile Applying a Service Profile to an Active Frame Relay WAN Port Frame Relay Port Configuration Monitoring Frame Relay WAN Ports 326 Point-to-Point Protocol PPP Overview Configuring PPP InterfacesUse of LCP Magic Numbers Setting up a PPP Service Profile Defining the Type and Location of a PPP Interface Configuring Multilink PPP Bundles Applying a Service Profile to an Active PPP PortCompression on MLP Bundles or Links PPP Port Configuration Monitoring PPP WAN Ports Ssrconfig# ppp apply service profile2 ports hs.5.1 WAN Configuration Examples Simple Configuration File Multi-Router WAN Configuration Multi-router WAN configuration Router R1 Configuration File Following configuration file applies to Router R1Router R2 Configuration File Following configuration file applies to Router R2 Router R3 Configuration File Following configuration file applies to Router R3Router R4 Configuration File Following configuration file applies to Router R4 Router R5 Configuration File Following configuration file applies to Router R5Router R6 Configuration File Following configuration file applies to Router R6 SmartSwitch Router User Reference Manual 337 338