Cisco Systems Cisco IOS XR manual Implementing the Integrated Switch System, Off Link Down

Chapter 3 Bringing Up the Cisco IOS XR Software on a Multishelf System

Integrated Switch System

•Test the FE links to all the rack hardware periodically.

•Keep the local state information synchronized to the rack master.

•Rearbitrate the shelf ownership if the primary router releases ownership.

Integrated Switch Control Network Topology

Once the 22-port SCGE cards are installed, the control network topology ceases to be a simple hub-and-spoke set of connections.

A control network topology provides the following functions:

•Each RP in a line card chassis is connected to two different 22-port SCGE cards in a fabric chassis.

•The 22-port SCGE cards are interconnected in a full mesh to provide an available control network with multiple redundant Ethernet connections.

•The 22-port SCGE cards appear to be a backbone in which different RPs are connected from the outside.

•Both the 22-port SCGE cards and RPs run the rapid spanning tree protocol (RSTP) to provide a loop-free topology.

LED Definitions for the Integrated Switch System

The 22-port SCGE displays the LEDs on the front panel foe every port. Table 3-5lists the LEDs that are used to obtain information about the link.

Table 3-5	LEDs for the Integrated Switch
LED		Description
Green		Link Up
Blinking Green		Activity
Amber		Port error disabled Unidirectional Link Detection
		(UDLD)
Off		Link Down

Implementing the Integrated Switch System

This section presents topics on how to implement the integrated switch system:

•Implementing the Integrated Switch Through ROMMON, page 3-23

•Implementing the Integrated Switch in Cisco IOS XR, page 3-24

•Booting Up the Integrated Switch Network, page 3-24

•Reenabling the Ports, page 3-24

Implementing the Integrated Switch Through ROMMON

When the 22-port SCGE comes out of reset, ROMMON must initialize the switches so that no loops get formed and the processor can communicate with the rest of the system. ROMMON configures the switches.

	Cisco IOS XR Getting Started Guide
OL-10957-02		3-23