Cisco 7609 User Manual

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Cisco 7600 Series Router Cisco IOS Software Configuration Guide—12.1E
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Chapter 5 Configuring RPR and RPR+ Supervisor Engine Redundancy
Supervisor Engine Redundancy Guidelines and Restrictions
Supervisor Engine Redundancy Guidelines and Restrictions
These sections describe supervisor engine redundancy configuration guidelines and restrictions:
• RPR+ Guidelines and Restrictions, page 5-4
• Hardware Configuration Guidelines and Restrictions, page 5-5
• Configuration Mode Restrictions, page 5-6
RPR+ Guidelines and Restrictions
The following guidelines and restrictions apply to RPR+:
Restrictions
• RPR+ redundancy does not support configuration entered in VLAN database mode. Use global
configuration mode with RPR+ redundancy (see Chapter 9, “Configuring VLANs”).
• Configuration changes made through SNMP are not synchronized to the redundant supervisor
engine. Enter a copy running-config startup-config command to synchronize the configuration on
the redundant supervisor engine.
• Supervisor engine redundancy does not provide supervisor engine mirroring or supervisor engine
load balancing. Only one supervisor engine is active. Network services are disrupted until the
redundant supervisor engine takes over and the router recovers.
• With RPR+, 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.
• 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

Cisco 7609 Specifications

General

Brand	Cisco
Model	7609
Category	Network Router
Language	English