Hot Swapping Modules; Power Management And Environmental Monitoring; Limiting Connection Distances - Cisco 7600 Series Module Manual

Hot Swapping Modules

interface in the system, learns the MAC addresses, and then initializes appropriate hardware and data
structures. Each VLAN in the spanning tree has one unique MAC address. This addressing scheme gives
the router the intelligence to identify the state (connected or not connected) of each interface. When you
hot swap a module, the MAC address changes with the module.
Hot Swapping Modules
You can remove and replace modules without powering down the router. This feature is known as hot
swapping.
When you remove or insert a module while the router is powered on and operating, the router does the
following:
1.
2.
3.
4.
The router runs diagnostic tests on any new interfaces. If the test passes, the router is operating normally.
If the new module is faulty, the router resumes normal operation but leaves the new interface disabled.
If the diagnostic test fails, the router crashes, which usually indicates that the new module has a problem
in the bus and should be removed.
To avoid erroneous failure messages, note the current configuration of all interfaces before you remove
Caution
or replace another module, and allow at least 15 seconds for the system to reinitialize after a module has
been removed or replaced.
For router module removal and installation procedures, refer to the Cisco 7600 Series Router Module
Installation Guide.

Power Management and Environmental Monitoring

For detailed information on power management and environmental monitoring, refer to the appropriate
Cisco 7600 Series Cisco IOS Software Configuration Guide for your software release.

Limiting Connection Distances

The length of your networks and the distances between connections depend on the type of signal, the
signal speed, and the transmission media (the type of cabling used to transmit the signals). For example,
fiber-optic cable has a greater channel capacity than twisted-pair cabling. The distance and rate limits in
this chapter are the IEEE-recommended maximum speeds and distances for signaling. However, if you
understand the electrical problems that may arise and can compensate for them, you should get good
results with rates and distances greater than those described here, although you do so at your own risk.
Cisco 7600 Series Router Module Guide
1-4
Determines if there is sufficient power for the module.
Scans the backplane for configuration changes.
Initializes all newly inserted modules, notes any removed modules, and places them in the
administratively shutdown state.
Places any previously configured interfaces on the module back to the state they were in when they
were removed. Any newly inserted interfaces are put in the administratively shutdown state, as if
they were present (but unconfigured) at boot time. If you insert a similar module type into a slot, its
ports are configured and brought online up to the port count of the original module.
Chapter 1 Modules Overview
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