3Com Router User Manual

Rlogin Terminal Service67
■Only supports IP address configuration. DNS is not supported. 
■The supported terminal type is VT100.
■The supported baud rate is 9600 bps.
■Supports remote access of user terminals connected with the asynchronous 
serial port under the flow mode by asynchronous private line or modem dial-up 
and supports the maintenance of terminals connected with Console port. 
Remote access of the terminals connected with routers in other means (such as 
through telnet) is not supported....

68CHAPTER 4: TERMINAL SERVICE
SCO OpenServer(TM) Release 5
(C) 1976-1998 The Santa Cruz Operation, Inc.
(C) 1980-1994 Microsoft Corporation.
All rights reserved.
For complete copyright credits,
enter copyrights at the command prompt.
you have mail                                                        
Terminal type is vt100                                               
#         
X.25 PAD Remote 
Access ServicePAD (Packet Assembly/Disassembly facility) is a definition specific to X.25 protocol.
The...

X.25 PAD Remote Access Service69
Therefore X.25 PAD devices actually serve as a procedure translator or network 
server, providing services to different terminals and helping them to access the 
X.25 network. 
The 3Com Router implements X.29 and X.3 protocol in the X.25 PAD as well as in 
the X.29 protocol-based Telnet application and the users can configure routers 
without geographical limitation, as shown in the figure below. When the user, for 
the sake of security, is unable to use IP protocol-based...

70CHAPTER 4: TERMINAL SERVICE
By default, no X.25 PAD remote user is configured at the Server side. 
For details of the Command, refer to the relevant sections on Security 
Configuration Commands in Command Reference (V1.6).
Start AAA authentication of X.25 remote users
After the configuration of X.25 PAD remote users, AAA authentication is started 
at the Server side for the purpose of identity authentication on receipt of a remote 
PAD request.
This command is not mandatory, but if required, it must be...

X.25 PAD Remote Access Service71
Exit command can also be nested with the Pad command. That is, users can 
access a third or even more routers from a router by repeatedly using the 
telnet/pad command or by repeatedly using the exit command to exit the 
routers being accessed in turns until returning to the one from which the first call 
is placed. 
Please implement the following configuration under the system view at the Server 
side.
Set the Response Time to the Invite Clear Message 
If for some...

72CHAPTER 4: TERMINAL SERVICE
cEnter the view of interface Serial 0 and set its link layer protocol as X.25 DTE 
IETF.
[RouterA]interface serial 0
[RouterA-serial0]link-protocol x25 dte ietf
dSet its X.121 address as 123456.
[RouterA-serial0]x25 x121-address 123456
2Configure Router B: 
aEnter the view of interface Serial 0 and set its link layer protocol as X.25 DTE 
IETF.
[RouterB]interface serial 0
[RouterB-serial0]link-protocol x25 dte ietf
bSet its X.121 address as 5678.
[RouterB-serial0]x25...

5
CONFIGURING NETWORK 
M
ANAGEMENT
This chapter includes information on the following topics:
■SNMP Overview
■RMON Overview
SNMP OverviewSimple Network Management Protocol (SNMP), a widely accepted industry 
standard, is the most dominant network management protocol in computer 
networks by far. It is developed to ensure transmission of management 
information between any two nodes, which will facilitate network administrators 
to search for information at any node on the networks for the purpose of...

74CHAPTER 5: CONFIGURING NETWORK MANAGEMENT
addition to the functions defined in SNMPv2c and SNMPv1. In other words, 
SNMPv3 develops SNMPv2c by adding security and management functions.
SNMPv1 and SNMPv2c lack security functions, especially in the aspect of 
authentication and privacy. SNMPv1 defines only a type of community 
representing a group of managed devices. Each NMS controls access to the 
devices via the community name list. However, agents do not verify whether the 
community names used by...

SNMP Overview75
sub-tree, the network administrator can access the device with read or write 
authority. Otherwise, the operations will be rejected.
SNMP architecture
An SNMP entity comprises one SNMP engine and multiple SNMP applications. The 
SNMP engine is the core of the SNMP entity. It transceives and authenticates 
SNMP messages, extracts PDU (Protocol Data Unit), reassembles messages, and 
communicates with the SNMP applications. SNMP applications process PDUs, 
implement protocol operations, and...

76CHAPTER 5: CONFIGURING NETWORK MANAGEMENT
Ta b l e 56   3Com Router-supported MIB
Configure SNMPSNMP configuration includes:
■Configure the network management agent on a router
■Configure the information of router administrator
■Configure the SNMP version
■Configure the trap
■Adjust the maximum size of SNMP packets 
1Configure network management agent on a router
Perform the following configurations in system view.
Ta b l e 57   Configure network management agent on a router
By default, the system...