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Cisco IOS XR Getting Started Guide
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Chapter4 Configuring General Router Features
Logging In to a Router or an SDR
•Telnet clients can connect to a Telnet server in the router. The Telnet server is disabled by default
and can be enabled with the telnet ipv4 server or telnet ipv6 server command in global
configuration mode.
•Secure Shell (SSH) clients can connect to an SSH server in the router. The SSH server is disabled
by default and can be enabled with the ssh server command in global configuration mo de. The SSH
server handles both Secure Shell Version 1 (SSHv1) and SSHv2 incoming client connections for
both IPv4 and IPv6 address families.
To start a Telnet network connection, you start the Telnet client software with a command similar to the
following:
telnet ManagementEthernetInterfaceIPaddress
For specific instructions on connecting to the router through a Telnet or SSH client, see the instructions
for that software.
Ask your system administrator for the IP address of the Ma nagement Ethernet interface.
When the Telnet session is established, the router prompts you to log in, as described in the “Loggi ng In
to a Router or an SDR” section on page 4-11.
Logging In to a Router or an SDR
The login process can require users to enter a password or a username and password before accessing
the router CLI. The user groups to which your username is assigned determine which commands you can
use.
If you log in to a router with a single SDR configured (this is th e default configuration), you can manage
the entire router. If you log in to the owner SDR on a system with multiple SDRs, you can manage
general features that apply to the entire system and the interfaces assigned to the owner SDR. If you log
in to a named SDR, you can manage only that SDR. For more infor mation on SDRs, see the “Secure
Domain Routers” section on page 4-1.
When you log in, the username and password may be validated by any of the following services:
•Usernames configured on the router (username command in global configuration mode)
•Root-system usernames configured on the owner SDR
•Passwords configured for the router console and auxiliary ports (password or secret command in
line configuration mode)
•A RADIUS server
•A TACACS+ server
The username and password validation method that your router uses is determined by the router
configuration. For information on configuring username and password validation methods, see the
Cisco IOS XR System Security Configuration Guide. For information on which username an d password
to use, see your system administrator.
To log in to the router, enter your username and password when prompted. For example:
User Access Verification
Username: iosxr
Password:
password
RP/0/RP0/CPU0:router#