Cisco 7604 User Manual

8-5
Cisco 7600 Series Router Cisco IOS Software Configuration Guide, Release 12.2SX
OL-4266-08
Chapter 8 Configuring RPR and RPR+ Supervisor Engine Redundancy
Supervisor Engine Redundancy Guidelines and Restrictions
RPR+ Guidelines and Restrictions
These guidelines and restrictions apply to RPR+:
• Network services are disrupted until the redundant supervisor engine takes over and the router
recovers.
• The Forwarding Information Base (FIB) tables are cleared on a switchover. As a result, routed traffic
is interrupted until route tables reconverge.
• Static IP routes are maintained across a switchover because they are configured from entries in the
configuration file.
• Information about dynamic states maintained on the active supervisor engine is not synchronized to
the redundant supervisor engine and is lost on switchover.
These are examples of dynamic state information that is lost at switchover:
– Frame Relay Switched Virtual Circuits (SVCs)
Note Frame Relay-switched DLCI information is maintained across a switchover because Frame
Relay-switched DLCI configuration is in the configuration file.
– All terminated PPP sessions
– All ATM SVC information
– All terminated TCP and other connection-oriented Layer 3 and Layer 4 sessions
– BGP sessions
– All Automatic Protection System (APS) state information
• Both supervisor engines must run the same version of Cisco IOS software. If the supervisor engines
are not running the same version of Cisco IOS software, the redundant supervisor engine comes
online in RPR mode.
• Supervisor engine redundancy does not support nondefault VLAN data file names or locations. Do
not enter the vtp file file_name command on a router that has a redundant supervisor engine.
• Before installing a redundant supervisor engine, enter the no vtp file command to return to the
default configuration.
• Supervisor engine redundancy does not support configuration entered in VLAN database mode. Use
global configuration mode with RPR+ redundancy (see Chapter 14, “Configuring VLANs”).
Hardware Configuration Guidelines and Restrictions
For redundant operation, the following guidelines and restrictions must be met:
• Cisco IOS running on the supervisor engine and the MSFC supports redundant configurations where
the supervisor engines and MSFC routers are identical. If they are not identical, one will boot first
and become active and hold the other supervisor engine and MSFC in a reset condition.
• Each supervisor engine must have the resources to run the router on its own, which means all
supervisor engine resources are duplicated, including all flash devices.
• Make separate console connections to each supervisor engine. Do not connect a Y cable to the
console ports.

Cisco 7604 Specifications

General

Brand	Cisco
Model	7604
Category	Network Router
Language	English