Figure - Cisco 12416 Installation And Configuration Manual

GRP Port Connection Guidelines
The GRP Ethernet port does not provide external routing functions. Its primary
roles are to act as a Telnet port into the router, and to boot or access Cisco IOS
software images over a network to which the GRP Ethernet port is directly
connected.
Cisco Express Forwarding (CEF) functions on these ports are switched off by
Caution
default for security reasons. Cisco strongly cautions you to consider the security
implications of switching on CEF routing functions on these ports.

Figure 2-14

•
•
Figure 2-14 Using the Ethernet Port on the GRP
(Cisco 12000
series router)
(Cisco 7500
series router)
Cisco 12016, Cisco 12416, and Cisco 12816 Router Installation and Configuration Guide
2-30
shows:
You cannot access Network 2.0.0.0 from Ethernet port (E0) on the GRP in
Router A. You can only access Host A, Host B, and Router C, which are in
Network 1.0.0.0 (see dotted-line arrows).
To access Network 2.0.0.0 from Router A, you must use an interface port on
one of the line cards (a POS line card in this example) in Router A. Data from
Router A is routed through Router B and Router C, to reach Network 2.0.0.0
(see solid-line arrows).
Router A
EO
POS
EO
Router B
Network 1.0.0.0
Host A
Host B
Router C
(Cisco 7500
series router)
Chapter 2 Preparing for Installation
Network 2.0.0.0
Host A
OL-11495-01