Cisco Router IOS XR Getting Started Manual page 60

Integrated Switch System
Table 3-4
Rack Type
Intra-Rack Switch
Inter-Rack Switch
Integrated Switch Functions
The 22-port SCGE performs the following functions:
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In active mode, you can perform the following functions:
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In standby mode, you can perform the following functions:
Cisco IOS XR Getting Started Guide
3-22
Differences Between Intra-Rack and Inter-Rack
Arbitrate for shelf ownership (active mode or standby mode) with the other 22-port SCGE card that
is installed on the rack.
Provide 22 GE ports for external system management communication across racks.
Performs the same type of control plane functions as the current SCGE for the multichassis system.
Performs the same type of control plane management functions as the Catalyst 6509. For example,
22-port SCGE card provides physical GE ports that allow control plane traffic to be distributed
throughout the fabric and line card chassis.
Supports 22 GE ports and has the capability to support up to 72 line card chassis.
Allows you to perform a hitless migration from an external Catalyst 6509 switch based network to
an internal 22-port SCGE based network with no loss of user or control traffic. For more
information, see Cisco CRS-1 Carrier Routing System Multishelf System Upgrade and Conversion
Guide.
Validates the link state before running the Spanning Tree Protocol (STP) that prevents a link from
being unidirectional and causes a spanning tree loop.
Checks the link for any unidirectional mode when a cable is plugged into the 22-port SCGE. If the
22-port SCGE software detects this condition, the port cannot be allowed to participate in the
spanning tree algorithm.
Download the Ethernet MAC addresses from the backplane EPROM and assign them to all boards
in the rack.
Start up and monitor power supplies, rack fans, and thermal sensors within the fabric rack upon
request from the system management network.
Start up board power supplies, download software images to the fabric cards in the rack upon request
from the system management network. Start and reset board processors.
Send alarms, reset, and shut down portions of the rack hardware in case of abnormal or dangerous
conditions in the rack.
Keep a log of the 22-port SCGE cards and rack activity on nonvolatile memory. Take core dumps
onto the hard disk.
Initiate a self-reset and rearbitration for shelf ownership in case of a watchdog timeout.
Control and monitor the fan speed.
Chapter 3 Bringing Up the Cisco IOS XR Software on a Multishelf System
Description
Provides connectivity inside the rack through FE ports. These
switches are similar to the RPs.
The GE1 link on intra-rack switches on the 22-port SCGE card
Note
is not connected.
Provides connectivity between the racks.
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