Cisco Catalyst 4500 Series, Software Configuration Manual

Page: 508 / 2086

11-6
Catalyst 4500 Series Switch, Cisco IOS Software Configuration Guide - Cisco IOS XE 3.9.xE and IOS 15.2(5)Ex
Chapter 11 Configuring Supervisor Engine Redundancy Using RPR and SSO on Supervisor Engine 6-E and Supervisor
Supervisor Engine Redundancy Guidelines and Restrictions
Step 4
Reload the standby supervisor engine with the redundancy reload peer command.
•
If you configure Supervisor Engine V-10GE to use both Gigabit Ethernet and 10-Gigabit Ethernet
uplinks without WS-X4302-GB in slot 10, module 10 is disabled and you cannot rollback the
configuration to use gigabit ports.
Enter the following commands to recover:
config t
hw-module uplink select tengigabitethernet // This sets the switch back to default
mode
!
ctrl z
wr me
redundancy reload shelf // The switch will reload with all 10 modules working ok
//The switch reloads
config t
hw-module uplink select gigabitethernet // This sets the switch to the desired link
!
ctrl z
wr me
redundancy reload shelf // The switch reloads with module 10 active with the gigabit
ethernet port(s) ON and the ten gigabit ethernet port(s) Off
•
RPR requires Cisco IOS Release 12.1(12c)EW, Release 12.1(19)E or later releases. SSO requires
Cisco IOS Release 12.2(20)EWA or later releases.
• The Catalyst 4507R switch and the 4510R switch are the only Catalyst 4500 series switches that
support supervisor engine redundancy.
•
In Cisco IOS Release 12.2(25)SG and later releases on a Catalyst 4507R series switch, 10-Gigabit
Ethernet and Gigabit Ethernet uplinks are concurrently usable.
• Redundancy requires both supervisor engines in the chassis to have the same components (model,
memory, NFL daughter card), and to use the same Cisco IOS software image.
•
When the WS-X4516 active and redundant supervisor engines are installed in the same chassis, the
four uplink ports (Gig1/1, Gig2/1, Gig 1/2, and Gig2/2) are available.
• The active and redundant supervisor engines in the chassis must be in slots 1 and 2.
•
Each supervisor engine in the chassis must have its own flash device and console port connections
to operate the switch on its own.
• Each supervisor engine must have a unique console connection. Do not connect a Y cable to the
console ports.
•
Supervisor engine redundancy does not provide supervisor engine load balancing.
• The Cisco Express Forwarding (CEF) table is cleared on a switchover. As a result, routed traffic is
interrupted until route tables reconverge. This reconvergence time is minimal because the SSO
feature reduces the supervisor engine redundancy switchover time from 30+ seconds to subsecond,
so Layer 3 also has a faster failover time if the switch is configured for SSO.
•
Static IP routes are maintained across a switchover because they are configured from entries in the
configuration file.
• Information about Layer 3 dynamic states that is maintained on the active supervisor engine is not
synchronized to the redundant supervisor engine and is lost on switchover.