Access by Digital Modem | 3Com 2500 specs

A-2 APPENDIX A: TECHNICAL SUPPORT

Access by Digital Modem

ISDN users can dial in to 3ComBBS using a digital modem for fast access up to 56 Kbps. To access 3ComBBS using ISDN, dial the following number:

(408) 654-2703

World Wide Web Site Access the latest networking information on 3Com’s World Wide Web site by entering our URL into your Internet browser:

http://www.3Com.com/

This service features news and information about 3Com products, customer service and support, 3Com’s latest news releases, selected articles from 3TECH™ journal (3Com’s award-winning technical journal), and more.

3ComForum on 3ComForum is a CompuServe® service containing patches, software, drivers, CompuServe® and technical articles about all 3Com products, as well as a messaging

section for peer support. To use 3ComForum, you need a CompuServe account.

To use 3ComForum:

1Log on to CompuServe.

2Enter go threecom

3Press [Return] to see the 3ComForum Main menu.

Image 178

3Com 2500 manual Access by Digital Modem, Press Return to see the 3ComForum Main menu

Contents

Lanplex 2500 Extended Switching User Guide 3Com Corporation 5400 Bayfront Plaza Santa Clara, California Contents Overlapped IP VLANs What Is Routing?Default Route Address Resolution Protocol ARP Example Dvmrp Metric Value Mbone Multicast Routing Algorithms FloodingPruning Elements IPX Routing About Aarp Administering interfaces LIS InterfacesAdministering Routes Displaying Interfaces 10-2 Deﬁning a Static RouteDisplaying the ATM ARP Cache 10-3 11-3 Displaying Routes Displaying the Multicast Cache11-2 11-3 Modifying an Interface 12-11 What Is RMON?MIB Objects 13-4 Alarms 12-12 Support from 3Com A-4 Returning Products for Repair A-4 Introduction When you conﬁgure your LANplex 2500 systemAbout this Guide Monitoring Rmon Icon Type Description Information Note ConventionsList conventions that are used throughout this guide Instructions LANplex 2500 Documentation LANplex 2500 Software Release Notes 801-00322-000 Module Installation Guides 2-5 , About this Guide About LANplex FeaturesSwitching Extended Using Menus Switching software Bridge Menu Hierarchy IP Menu Hierarchy IPX Menu Hierarchy Appletalk Menu Hierarchy About VLANs For the network administratorVlans on Vlan concept in LAN technology helps minimize broadcast Vlans on the Lanplex System Ethertype, Snap PID SNA Services over Ethernet EthertypeVlan Conﬁguration Protocol Suite DECnet Switch Ports Layer 3 Addressing Information About VLANs IP port VLAN, so the Default Vlan is usedIndex 1 2 Data received on Source port Data received on Is flooded on Because XNS port So the Default Vlan is usedDefault None System On port IP subnet Data received on Is flooded on Because IP subnet158.103.122.2 158.103.123.2 About VLANs Vlan Examples Example Example of a Protocol-Sensitive Vlan Conﬁguration Example A Vlan Conﬁguration with Servers on Separate 100BASE-T ports Vlans on the Lanplex System Bridging and Routing Lanplex System Subnetted Architecture with LANplex Switching Hubs Multiple Ports per Subnets with the LANplex 2500 System Bridging Routing Models Bridging in the Traditional Bridging and Routing Model Bridging in the LANplex Bridging and Routing Model Routing in the LANplex Bridging and Routing Model Bridging and Routing in the Lanplex System IP Routing Routing with IP TechnologyOSI Model Section Elements of IPRouting Hardware-conﬁgured 48-bit addresses Address Classes How a Subnet Mask Is Applied to the IP Address Shows the routing table of the router in Figure Dynamic Routes Using RIP Static Routes Example of an ARP Cache Example of ARP Cache Updated with ARP Reply Errors Transmission Routing with Classical IP over References Forwarding to Nodes within an LIS Routing with IP Technology About IP Routing with IP MulticastMulticast Routing Tunnels on page 6 for more information about tunnels To a multicast routerProvider Multicast tunnel only if the Time-To-Live TTL value present Algorithms routing Flooding Spanning Trees Reverse Path Forwarding Simple Network Implemented Without Using Spanning Tree Shows a simple network with ﬁve links Interfaces MulticastWhich are described in this section Routing with IP Multicast NetWare IPX RoutingEnvironment Be provided by protocols above IPX NetWare Protocols and the OSI Reference Model Protocol RIP Shows the IPX packet format How IPX Routing Works IPX Packet Routing How IPX Routing Works Elements Service Advertising Protocol SAPIntranetwork Aging Timer The time since the network’s last update Shows an example of a typical routing information table Internetwork Service Information IPX Packet Format Routing with IPX Server Information Table Server Information Maintenance Elements of IPX Routing Routing with IPX AppleTalk Routing in AN Appletalk EnvironmentAbout AppleTalk Network Named Entities AppleTalk Networks and AppleTalk Zones Protocols AppleTalk Protocols and the OSI Reference Model Routing in AN Appletalk Environment AppleTalk Protocols Network Router Interface AppleTalk Protocols Mapping for both extended and nonextended networks About AarpDescription language used by many printers Another probe packet About Aarp Routing in AN Appletalk Environment From the top level of the Administration Console, enter Administering VlansDisplaying Vlan Information Fields for Vlan Information Description Index Example of a detailed display for the VLANsDescribes these statistics Layer Deﬁning Vlan Information Modifying Vlan Information Vlan Removing Vlan Follow these steps to remove a Vlan deﬁnition InformationEnter the indexes for the VLANs you want to remove Example Administering Vlans Administering IP Routing Administering Administering IP Routing Ip interface summary Ip interface detail Example detail display Example summary displayDeﬁning an IP LIS Interface LIS interface example with both PVCs and SVCs Atm Route Arp Detail Modifying an Interface Accept the default yes if you want to delete the interfaceRemoving an Removing an Advertisement Address Removing a Permanent Virtual Circuit PVC RoutesAdding a Permanent Virtual Circuit PVC Automatically Timing out Static Route was statically configured LearnedInterface Status Information Description Direct Timed out Displaying Routing Table Removing a Route Flushing a Route ARP Cache Default route is immediately removed from the routing tableCorresponding MAC addresses Displaying the ARP String from the top level of the Administration ConsoleExample display of the contents of the ARP cache Cache Flushing the ARP Cache Administer the ATM ARP cacheATM ARP Servers ARP cache entries are immediately removed from the table ATM switch, such as 3Com’s CELLplex 7000 system Removing an ATM ARP Server Removing an ATM ARP Cache Entry Ip atmArpServer arp Display Flushing the ATM Bootp including Dhcp = Time = DNS =UDP Helper Are modiﬁed and then forwarded through the router Displaying UDP Helper Information Enabling Disabling IP Routing Mode Setting the RIPEnabling Disabling Icmp Router Discovery Operate in any of three modes Enter the IP address of the station you want to ping Pinging an IP StationYou may receive one of the following responses Displaying IP Statistics Describes the IP statistics Administering IP Routing Administering IP Multicast Routing Disabling Igmp Enabling and Disabling DvmrpEnabling Methods to make this determination Administering IP Rate Limit From the top level of the Administration Console, enterExample multicast interface conﬁguration Disabling Multicast Interfaces Enabling Multicast Interfaces IP address of the remote multicast router Multicast Tunnels Administration Console, enterMulticast Tunnels Displaying Removing a Multicast Tunnel Deﬁning a To deﬁne an IP multicast tunnel Multicast TunnelTunnel is removed Displaying Routes Describes the ﬁelds in the route display Displaying the Multicast Cache You are prompted for the multicast source address Following display shows the multicast cache conﬁguration Describes the ﬁelds in the cache display Administering IP Multicast Routing Administering IPX Routing Formats and two Fddi encapsulation formats. The Ethernet Deﬁne an associated interfaceAddress. Each address within the network should be unique Is available for communications Up or unavailable Down From the Administration Console top-level menu, enter Deﬁning an IPX Ipx interface modify Routers Administration ConsoleKnown to the router Segment. a tic is approximately 55 milliseconds Deﬁning a Static Route As well as the routing tableConsole top-level menu, enter Ipx route remove Server table using the Administration Console Servers Console top-level menu, enter Deﬁning a Static Server Removing a Server To remove a server From the Administration Console top-level menu, enterEnter the number of hops to the server. Example Flushing Servers Setting IPX Forwarding Follow the IPX router implementation guidelines SettingEnhanced RIP Brackets, press Return at the prompt Setting the SAP Enter the SAP mode off, passive, or active. To use the value Displaying Statistics Example below Describers the IPX RIP statistics SAP Entries Number of servers in the server table Describes the IPX SAP statisticsSAP Requests Been received Describes the IPX forwarding statistics Ipx statistics forwarding Errors in network layer header Hdr ErrorsLayer header errors No Routes Administering Appletalk Routing Associated AppleTalk interface Displaying AppleTalk Interfaces Deﬁning an Interface Enter the zone name Removing an Interface Appletalk route display Following example shows a routing table display 12-7 Following example shows an Aarp cache display Removing an Entry To remove an Aarp cache entry Cache Displaying the Zone Table Conﬁguring Forwarding Enter enable or disable at the promptZone Table by Zones Conﬁguring Checksum Enter enable or disable at the checksum generation promptEnter enable or disable at the checksum veriﬁcation prompt Pinging an AppleTalk Node Following is an example of DDP summary statistics Describes the AppleTalk DDP statistics you can view An example of summary statistics is shown below Displaying Rtmp InformationDescribes the Rtmp statistics you can view Displaying ZIP Information Describes the ZIP statistics you can view Displaying NBP Information Describes the NBP statistics you can view Remote Monitoring Rmon and the Lanplex System Remote Monitoring Rmon Technology Remote Monitoring Rmon Technology Remote Monitoring Rmon Technology Segment being monitored AlarmVariable and trigger an alarm History Management Information Base Example of an Rmon MIB Counter Object Application for details on setting up alarms AlarmsInstances of when counters exceed their set threshold You misleading results Manually Set Thresholds Generates an alarm only under the following conditions Appendix Appendix a Technical Support Technical Support ServicesVariety of services. This appendix describes these services On-line Technical Access by Digital Modem Press Return to see the 3ComForum Main menu Your Network Maintenance, application training, and support servicesSupport from Supplier 3Com U.S. and Canada, call 800 876-3266 for customer serviceSupport contracts are available from 3Com Index Numerics See also RIP See also SAP Mbone MIB See also Fddi station statistics Tunnels IP multicast 5-6