CHAPTER
6-147
Cisco IOS XR Troubleshooting Guide for the Cisco CRS-1 Router
OL-21483-02
6
Troubleshooting the Control Plane Ethernet
Network
This chapter describes techniques that you can use to troubleshoot the control plane Ethernet network
on routers using Cisco
IOS XR software. It includes the following sections:
• Cisco CRS-1 Control Plane Ethernet Network Overview, page 6-147
• Using the Online Diagnostics Tools, page 6-148
• Troubleshooting Booting the System Control Plane Ethernet Network, page 6-149
• Troubleshooting the Multishelf System Router Topology, page 6-153
• Troubleshooting the CRS-1, 4-slot, 8-slot, or 16-slot System Router Topology, page 6-159
Cisco CRS-1 Control Plane Ethernet Network Overview
The system control plane Ethernet network is used for processes on different devices to communicate
for functions such as system device discovery, image transfers, heartbeat messages, alarms, and
configuration management.
All devices in a system using Cisco IOS XR software connect to the system control plane Ethernet
network. There are two control planes in the control Ethernet topology:
• Intrachassis—Within a chassis, the control plane is provided using Fast Ethernet (FE) links between
nodes. The FE links are internal to the chassis and cannot be removed.
• Interchassis—System Control Plane connectivity between chassis in the system is provided using
Gigabit Ethernet (GE) links. Two links are presented on the front of each of the route processors
(active and standby) in each of the line card chassis (LCCs) and shelf controllers (active and
standby) in the fabric card chassis (FCC). Two ports are provided for redundancy purposes. This
control plane is supported on the Cisco
CRS-1 Multishelf System only.
See Figure 6-1 for an illustration of the Cisco CRS-1 control plane Ethernet network
See Figure 6-2 for an illustration of the Cisco CRS-1 Multishelf System control plane Ethernet network.
Two external Catalyst switches (WS-C6509-NEB-A) are used to provide connectivity between the FCC
and LCCs. In the Cisco
CRS-1 Multishelf System, the system control plane links from each route
processor (RP) and shelf controller (SC) connect to an external Catalyst switch. RPs and SCs are not
directly connected to each other. See
Figure 6-2.
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