Cisco Systems 12406, 12006

Chapter3 Installing the Router

Connecting to the Console and Auxiliary Ports

3-26

Cisco 12006 and Cisco 12406 Router Installation and Configuration Guide

OL-11497-03

Note Use cables that comply with EIA/TIA-568 standards. (See Table 3-8 on page 3-29

and Table3-9 on page 3-29 for cable recommendations and specifications.)

Caution The Ethernet ports are used primarily as Telnet ports into the router, and for

booting or accessing Cisco IOS 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 3-14 shows an example of the functionality of an Ethernet port. In this

example, you cannot access Network 2.0.0.0 via 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 Figure3-14.)

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 Figure 3-14.)

Figure 3-14 Using the Ethernet Port on the PRP

Router A

(Cisco 12000 series)

Router B

(Cisco 7500 series)

Router C

(Cisco 7500 series)

POS

Host A

Network 1.0.0.0

Host B

S6755

Host A

Network 2.0.0.0