Router Installation Guide

Chapter 3 Installing the Router
Connecting the PRP to an Ethernet Network
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Cisco XR 12404 Router Installation Guide
OL-13830-02
RJ-45 cables are not available from Cisco Systems, but are available from outside
commercial cable vendors.
Note Only connect cables that comply with EIA/TIA-568 standards. See Table 3-4 and
Table 3-5 for cable recommendations and specifications.
Note To comply with Telcordia GR-1089 NEBS standard for electromagnetic
compatibility and safety, connect all console, auxiliary, and Ethernet interfaces
only to intrabuilding or non-exposed wiring or cabling. The intrabuilding cable
must be shielded and the shield must be grounded at both ends.
Caution The Ethernet ports are primarily used as a Telnet port into the Cisco XR 12000
Series Router, and for booting or accessing Cisco IOS XR software images over
a network to which an Ethernet port is directly connected. Cisco Express
Forwarding (CEF) functions are switched off by default for security reasons.
Cisco strongly cautions you to consider the security implications of switching on
CEF routing functions on these ports.
Figure 3-10 is an example of the functionality of an Ethernet port. In this example,
you cannot access Network 2.0.0.0 through the Ethernet port (ETH0) on the PRP
in router A; you can only access the hosts and router C, which are in Network
1.0.0.0 (see dotted arrows in Figure 3-10).
To access Network 2.0.0.0 from router A, you must use an interface port on one
of your line cards (in this example, a Packet-over-SONET (POS) line card in
router A) to go through router B, through router C, and into Network 2.0.0.0 (see
solid arrows in Figure 3-10).
todd.book Page 19 Tuesday, July 24, 2007 3:54 PM