Chapter3 Installing the Cisco XR 12406 Router
Connecting the PRP to an Ethernet Network
3-20
CiscoXR 12406 Router Installation Guide
OL-13831-01
Note Use cables that comply with EIA/TIA-568 standards. See Table 3-4 on pa ge 3-23
and Table3-5 on page 3-24 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 used primarily as Telnet ports into the 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 funct ions on these
ports.
Figure 3-10 shows an example of the functionality of an Ethernet port. In this
example, you cannot access Network 2.0.0.0 through the Ethern et 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, use an interface port on one of the 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 Figure3-10).