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Network Router
3Com
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Troubleshooting
757
■
If the modem is still in abnormal status, proceed to run the
AT
string, such as
“AT&F OK ATE0S0=0&C1&D2 OK AT&W” on the router physical interface
connected to the modem.
Contents
Main
3Com Corporation 350 Campus Drive Marlborough, MA 01752-3064
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ABOUT THIS GUIDE
This guide describes 3Com routers and how to configure them.
Tabl e 2 Text Conventions
Conventions
Tabl e 1 Notice Icons
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Overview of the 3Com Router System
Architecture of the 3Com Router
Figure 1 Schematic diagram of the 3Com Router architecture
Features of the 3Com Router Version 1.10
Tabl e 3 List of the 3Com Router 1.x features
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New Features of the 3Com Router 1.x
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Establish Configuration Environment
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Command Line Interface (CLI)
View
Figure 14 Hierarchical view structure of the 3Com Router
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Command Line Online Help
helps:
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User Identity Management
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Storage Media and File Types Supported by the System
Upgrade Boot ROM Software
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Upgrade the 3Com Router Main Program Software
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Configure On-Line Upgrading of the Card
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Configuration File Management
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Configure FTP
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Terminal Service Overview
Terminal Message Service
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Dumb Terminal Service
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Terminal Service of Telnet Connection
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Rlogin Terminal Service
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X.25 PAD Remote Access Service
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SNMP Overview
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Tabl e 61 Configure the maximum size of SNMP packets that the agent can send/receive
Tabl e 62 Display and debug SNMP
Display and Debug SNMP Perform the following commands in all views.
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RMON Overview
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Display Command Set
Debugging Command Set
Test Tool of Network Connection
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Log Function
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POS Access Service Overview
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POS Access Service Configuration POS access service configuration includes:
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Display and Debug POS Access
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Example of POS Access Service
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Interface Configuration Overview
Configure Interface
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Display and Debug Interface
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Ethernet Interface Overview
Configure Ethernet Interface
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Display and Debug Ethernet Interface
Typical Ethernet Interface Configuration
Troubleshooting
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WAN Interface Introduction
Asynchronous Serial Interface
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AUX Interface
Synchronous Serial Interface
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ISDN BRI Interface
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CE1/PRI Interface
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CT1/PRI Interface
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E1-F Interface
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T1-F Interface
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CE3 Interface
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CT3 Interface
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Logical Interface Introduction
Dialer Interface
Loopback Interface
Configure Loopback Interface
Null Interface
Sub-Interface
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Standby Center Logic Channel
Virtual-Template and Virtual Interface
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PPP Overview
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MP Overview
Configure PPP
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Configure MP
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Display and Debug PPP
Typical PPP Configuration
Typi cal MP Configuration
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Fault Diagnosis and Troubleshooting of PPP
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PPoE Overview
Configure PPPoE Client
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Display and Debug PPPoE Client
Typical PPPoE Configuration
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SLIP Overview
Configure SLIP
Display and Debug SLIP
Typical SLIP Configuration
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ISDN Overview
Configure ISDN
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Display and Debug ISDN
Typical Configuration
Fault Diagnosis and Troubleshooting of ISDN
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X.25 and LAPB Protocols Overview
PSN
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Configure LAPB
Configure X.25
Configure X.25 Interface
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Tabl e 245 Set/Cancel the default upper layer protocol borne on X.25
By default, the upper protocol carried by X.25 is IP protocol.
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Tabl e 250 Specify/Cancel packet pre-acknowledgement
Tabl e 251 Configure X.25 user facility
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Tabl e 263 Add/Delete X.25 switching route whose forwarding address is hunt group
5Configure other X.25 switching routes
Tabl e 264 Add/delete other X.25 switching routes
Configure X.25 over Other Protocols
Figure 66 XOT typical application diagram
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Display and Debug LAPB and X.25
Typ ica l L AP B Configuration
Typi cal X. 25 Configuration
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Figure 72 Diagram of X.25 sub-interface configuration
III. Configuration Procedure
aCreate sub-interface serial 0.1
bCreate sub-interface serial 0.2
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Fault Diagnosis and Troubleshooting of LAPB
Fault Diagnosis and Troubleshooting of X.25
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Frame Relay Protocol Overview
Configure Frame Relay
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Configure Frame Relay QoS
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Discarded Transmit
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Configure Frame Relay over Other Protocols
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Display and debug Frame Relay
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Configuration
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Fault Diagnosis and Troubleshooting of Frame Relay
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Configure HDLC
Display and Debug HDLC
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Bridge Overview
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Bridge Overview 291
Figure 102 Bridge learns that Workstation A is connected with Port 1
Figure 103 Bridge learns that Workstation B is connected with the port 1 too.
292 CHAPTER 19: CONFIGURING BRIDGE
Figure 104 Final bridging address table
Figure 105 Forward
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Multi-Protocol Router
Configure Bridges Routing Function
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Tabl e 349 Configure bridge on VLAN
Display and Debug Bridge
Tabl e 350 Display and debug bridge
Typical Bridge
Figure 111 Networking of building transparent bridges between multiple Ethernet segments
III. Configuration Procedure 1
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IP Address Overview
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PSTN
Troubleshooting IP Address Configuration
Map between WAN Interface IP Address and Link Layer Protocol Address
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Configure Address Resolution Protocol (ARP)
Configure Domain Name Resolution (DNS)
VLAN Configuration
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DHCP Server Configuration
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Configure DHCP Relay
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Configure Network Address Translation (NAT)
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Configure IP Performance
Configure TCP Performance
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Configure Fast Forwarding
Display and Debug IP Performance
Troubleshooting IP Performance Configuration
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IP Count Introduction
IP Count Configuration
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Display and Debug IP Count
Typical Configuration Example
Troubleshooting
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IPX Protocol Overview
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Configure IPX
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DLSw Protocol Overview
Configuration of DLSw
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Tabl e 463 Configure acknowledgement wait time T2 of SDLC secondary station
By default, the acknowledgement wait time T2 of SDLC secondary station is configured to be 500 ms.
Display and Debug DLSw
Typi ca l DL Sw Configuration
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Figure 141 Networking Diagram of SDLC-LAN
III. Configuration Procedure: 1Router A Configuration:
2Router B Configuration:
Diagnosis and Troubleshooting of DLSw Fault
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VI
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IP Routing Protocol Overview
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Routing Management Strategy
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Static Route Overview
Configuring a Static Route
Displaying and Debugging the Routing Table
Static Route Configuration Example
Troubleshooting a Static Route
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RIP Overview
Configure RIP Begin all configuration tasks by first enabling the RIP routing process and
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Configure filtering the routing information being advertised
Tabl e 484 Filter the Routing Information Being Advertised by RIP
Tabl e 485 Reset RIP
Displaying and Debugging RIP
RIP - Unicast Configuration
Troubleshooting RIP
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OSPF Overview
Configuring OSPF
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Displaying and Debugging OSPF
OSPF Configuration Example
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Figure 148 Networking diagram of configuring DR selection of OSPF preference
III. Configuration procedure
BDR
E0 192.1.1.1/24 E0 192.1.1.4/24 E0 10.1.2.3/24 E0 192.1.1.2/24
DR 1.1.1.1 4.4.4.4
2.2.2.2
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Figure 149 Networking diagram of configuring OSPF virtual link
To configure an OSPF virtual link:
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BGP Overview
Configuring BGP
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Tabl e 515 Configure to Send Community Attribute to the Peer
Tabl e 519 Create a Routing Policy for the Peer
Tabl e 516 Configure the Peer to be the Client of the Route Reflector
7Configure to distribute default route to the peer.
Tabl e 517 Configure to Distribute Default Router to the Peer
Tabl e 518 Set the Own IP Address as the Next Hop When the Peer Distributes Route
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Tabl e 553 Define a Routing Policy
Define a match rule Perform the following configurations in BGP Routing policy view.
Tabl e 555 Define An Apply Clause
Tabl e 554 Define a Match Rules
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Configure Filtering Route Information being Advertised by BGP
Tabl e 557 Filter Routing Information Being Advertised by BGP
By default, BGP does not filter any route information that is received or advertised.
connections and reset BGP connections to make the new configuration effective.
Displaying and Debugging BGP
BGP Configuration Example
1003, which are configured with EBGP, confederation EBGP and IBGP.
Disable BGP packet debugging
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Figure 155 Networking diagram of configuring route reflector
aConfigure BGP peers
bEnable OSPF
cConfigure Serial 0
dConfigure Serial 1
aConfigure BGP peers and route reflector clients
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Figure 156 Networking diagram of configuring BGP path selection
aStart BGP
bSpecify BGP transmission network
cConfigure peer
dConfigure MED attribute of Router A
routing diagram is network 1.0.0.0. The MED attribute is 50, and the second MED attribute is 100.
Set the local preference attribute of Router C.
A).
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IP Routing Policy Overview
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Configure IP Routing Policy
Tabl e 561 Configure a Matching Rules
AND operations in the matching process so the routing information cannot
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Displaying and Debugging IP Routing Policy
Configuring IP Routing Policy
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Troubleshooting IP Routing Policy
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IP Policy Routing Overview
Configuring IP Policy Routing
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Displaying and Debugging IP Policy Routing
IP Policy Routing Configuration
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IP Multicast Overview
IP Multicast Addresses
IP Multicast Features
IP Multicast Routing Protocols
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IP Multicast Packet Forwarding
IP Multicast Application
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IGMP Overview
Configuring IGMP
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Displaying and Debugging IGMP
IGMP Configuration Example
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PIM-DM Overview
PIM-DM Configuration
Displaying and Debugging PIM-DM
PIM-DM Configuration Example
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PIM-SM Overview
PIM-SM Configuration
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Displaying and Debugging PIM-SM
PIM-SM Configuration Example
Troubleshooting PIM-SM
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Terminal Access Security Overview
Configuring Terminal Access Security
EXEC Configuration Example
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AAA Overview
RADIUS Overview
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Configuring AAA and RADIUS
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Displaying and Debugging AAA and RADIUS
AAA and RADIUS Configuration Examples
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Troubleshooting AAA and RADIUS
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Firewall Overview
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Tabl e 619 Mnemonic Symbol of the Port Number
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Configure Firewall
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Displaying and Debugging Firewall
Firewall Configuration Example
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IPSec Protocol Overview
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Configuring IPSec
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Creating a Security Policy
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Tabl e 643 Configure SPI Parameters of Security Policy Association
Tabl e 644 Configure Key Used by Security Policy Association
By default, no key is used by any security policy.
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Displaying and Debugging IPSec
Tabl e 653 Display and Debug IPSec
Displaying and Debugging the NDEC Card
Tabl e 654 Reset crypto card
Displaying and Debugging the crypto card Use the debugging, reset and display command in all views.
Tabl e 655 Display and Debug NDEC Card
IPSec Configuration Example
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Troubleshooting IPSec
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IKE Protocol Overview
Configuring IKE
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Displaying and Debugging IKE
IKE Configuration Example
Troubleshooting IKE
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VPN Overview
Basic Networking Applications of VPN
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VPDN and L2TP Overview
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Basic Configuration at LAC
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Basic Configuration at LNS
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Advanced Configuration at LAC or LNS
Configure the Local Name
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Display and Debug L2TP
L2TP Configuration
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Troubleshooting L2TP
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GRE Protocol Overview
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Configuring GRE
Interface
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GRE Configuration
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Troubleshooting GRE
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Standby Center Overview
Configuring the Standby Center Standby center configuration includes:
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Displaying and Debugging the
Standby Center Configuration
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VRRP Overview
Configuring VRRP
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Displaying and Debugging VRRP
VRRP Configuration Examples
Internet
Troubleshooting VRRP
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What Is QoS?
Three Types of QoS Services
Benefits of QoS for the Network Service
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AND LINE RATE
Traffic Classification Overview
Traffic Policing Overview
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Committed Access Rate (CAR)
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Traffic Shaping
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Physical Interface Line Rate
Displaying and Debugging LR
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What is Congestion?
Congestion Management Policy Overview
Selecting Congestion Management Policies
Tabl e 719 Comparison of Several Congestion Management Policies
Operating Principle of the Congestion Management Policies
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Configuring Congestion Management
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Congestion Management Configuration
Figure 222 Networking diagram of CQ typical configuration
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aConfigure the CQ queue
bConfigure Serial0 master/slave addresses
cApply the CQ queue 1 to Serial0
dConfigure Tunnel0
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Congestion Avoidance Overview
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WRED Configuration
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DCC Overview
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Configuring DCC
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Displaying and Debugging DCC
DCC Configuration
3Configure RouterC:
4Configure RouterB:
5Configure RouterC:
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Figure 234 Network for the DCC application providing MP binding
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Figure 240 Network for the DCC application providing logic interface standby through dialer route
Troubleshooting DCC
Use the DCC Debugging Information to Locate Problems
Tabl e 774 DCC Fault Messages
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Modem Function Provided by 3Com Routers
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Configuring a Modem
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Displaying and Debugging a Modem
Modem Configuration Examples
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Troubleshooting