Single Router Mode Redundancy - Cisco WS-X6066-SLB-APC - Content Switching Module Software Manual

Chapter 22 Configuring Redundancy

Single Router Mode Redundancy

These sections describe how to configure single router mode (SRM) redundancy:
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SRM redundancy is an alternative to internally redundant (dual) MSFC2 configurations where both
MSFC2s are active at the same time. In SRM redundancy, only the designated router is visible to the
network at any given time. The nondesignated router is booted up completely and participates in
configuration synchronization which is automatically enabled when entering SRM. All configuration
following the "alt" keyword is ignored in SRM. Due to this, the nondesignated router's configuration is
exactly the same as the designated router but its interfaces are kept in a line down state and are not visible
to the network. Processes, such as routing protocols, are created on the nondesignated router and the
designated router, but all nondesignated router interfaces are in a line down state; they do not send or
receive updates from the network.
When the designated router fails, the nondesignated router changes its state from a nondesignated router
to a designated router and its interface state changes to link up. It builds up its routing table while the
existing supervisor engine switch processor entries are used to forward Layer 3 traffic. After the newly
designated router builds its routing table, the entries in the switch processor are updated.
Hardware and Software Requirements
To configure SRM redundancy, you must have the following hardware and software:
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Note
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78-13315-02
Hardware and Software Requirements, page 22-41
Configuration Guidelines, page 22-42
Configuring Single Router Mode Redundancy, page 22-42
Upgrading Images with Single Router Mode Enabled, page 22-44
Getting Out of Single Router Mode, page 22-45
A single chassis with two identical supervisor engine daughter card configurations:
Supervisor Engine 2 with PFC2 and MSFC2
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Supervisor Engine 1 with PFC and MSFC or MSFC2
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Cisco IOS Release 12.1(8a)E4 provides initial support for single router mode (SRM)
redundancy with Supervisor Engine 1 and MSFC.
When using Supevisor Engine 1 with the MSFC or MSFC2 for SRM redundancy, be aware that
failover to the second MSFC is not stateful for multicast MLS. When the primary MSFC fails, all
multicast MLS entries are removed and are then recreated and reinstalled in the hardware by the
newly active MSFC.
Supervisor engine software release 6.3(1) or later releases
Cisco IOS Release 12.1(8a)E2 or later releases
Catalyst 6000 Family Software Configuration Guide—Releases 6.3 and 6.4
MSFC Redundancy
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