Specifications

8-6
Cisco MGX 8850 (PXM45) and MGX 8950 Software Configuration Guide
Release 3, Part Number 78-14788-01 Rev. C0, January 2004
Chapter 8 Switch Maintenance Procedures
Replacing Cards with the Same Card Type
Automatic Response for Redundant PXM45 Installations
For redundant PXM45 installations, the nativity check is performed only on the active PXM45 card set.
If an active PXM45 card set is operating correctly, you can replace any card in the standby or non-active
card set, and the active card set will attempt to configure the replacement card and bring it up in standby
mode.
Table 8-1 Automatic Response to Nativity Checks in Standalone Installations
Event Nativity Check Results Response
PXM45 front card and hard disk card
have not changed.
Both PXM45 cards are configured with
the correct chassis serial number.
No action is required.
PXM45 front card is replaced with an
unconfigured card.
PXM45 front card is not configured and
the hard disk card is configured with
the correct chassis serial number.
The switch builds the PXM45 front card
configuration from the configuration on the
hard disk.
PXM45 front card is replaced with a
previously configured front card.
PXM45 front card is not configured
with the correct chassis serial number.
The hard disk card is configured with
correct chassis serial number.
The switch rebuilds the PXM45 front card
configuration from the configuration on the
hard disk.
The hard disk card is replaced with
an unconfigured card.
PXM45 front card is configured with
the correct chassis serial number, but
the hard disk card is not configured.
The hard disk configuration cannot be
completely built from the configuration on
the front card. You must manually resolve
the configuration conflict as described in
the “Manually Responding to Nativity
Checks” section, which appears later in this
chapter.
The hard disk card is replaced with a
previously configured hard disk card.
PXM45 front card is configured with
the correct chassis serial number, but
the hard disk card is not configured
with correct chassis serial number.
The hard disk configuration cannot be
completely rebuilt from the configuration
on the front card. You must manually
resolve the configuration conflict as
described in the “Manually Responding to
Nativity Checks” section, which appears
later in this chapter.
PXM45 front card and hard disk card
are replaced with unconfigured
cards.
No configuration exists on either card. There is no existing configuration to use.
You must configure the switch or restore a
saved configuration.
PXM45 front card and hard disk card
are replaced with a set that was
configured in another switch.
PXM45 front card and hard disk card
are configured with matching chassis
serial numbers, but the configured
serial number does not match the
chassis serial number.
The switch uses the configuration on the
matched set.
Both PXM45 front card and hard disk
card are replaced with cards that
were configured in different
switches.
PXM45 front and hard disk cards are
configured with chassis serial numbers
that do not match each other or the
backplane serial number for the switch
in which they are installed.
In this scenario, you can clear the
configuration stored on the PXM45 cards,
restore a configuration from a saved file, or
you can use the configuration stored on the
hard disk. You must manually resolve the
configuration conflict as described in the
“Manually Responding to Nativity Checks”
section later in this chapter.