Chapter 3 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
Table 3-9 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
Figure 3-14
.)
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
EO
Host A
Network 1.0.0.0
EO
Host B
S6755
Host A
Network 2.0.0.0
