User`s guide

68 XSR Users Guide
General IP Features Chapter 5
Configuring IP
IRDP allows hosts to locate routers and can also infer router locations by
checking RIP updates. When the XSR operates as a client, router discovery
packets are generated. When the device operates as a host, router discovery
packets are received. The IRDP client/server implementation does not
actually examine or store full routing tables sent by routing devices, it merely
keeps track of which systems are sending such data.
Using IRDP, the XSR can specify both a priority and the time after which a
device should be assumed down if no further packets are received.
The XSR enables router discovery and associated values with the ip irdp
command. The router also supports the redirection of packets routed through
the same port they were received on with the
ip redirect command.
TCP
The Transmission Control Protocol (TCP) is a transport layer language providing
a connection-oriented, reliable, byte-stream service described by RFC-793.
UDP
The User Datagram Protocol (UDP) is a simple, datagram-oriented, transport
layer protocol where each operation by a process produces exactly one UDP
datagram, which causes one IP datagram to be sent. RFC-768 describes UDP.
Telnet
Telnet provides a general, bi-directional, 8-bit byte-oriented communications
facility that is always enabled on the XSR. It is a standard method by which
terminal devices and terminal-oriented processes interface, as described by
RFC-854. A Telnet connection is a TCP connection used to transmit data with
interspersed Telnet control data. Two entities compose a Telnet link:
A Telnet server is the host which provides some service
A Telnet user is the host which initiates communications
Telnet port (23) and server settings can be configured on the XSR with the
ip
telnet port
and ip telnet server commands. You can also configure
Telnet client service to other servers with the
telnet ip_address command.
Refer to the XSR CLI Reference Guide for more information.