CPM redundancy and Data Plane connectivity

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Article ID: 169449

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Updated On:

Products

XOS

Issue/Introduction

Understanding "show module status reachability" command output when using CPM redundancyN/A

Cause

This article explains CPM redundancy and internal communication paths: data and control planes.

Resolution

The data plane is used for NPM communication with APM and CPM.
CPMs use the control plane to communicate with NPMs and APMs.
There is no data plane communication between CPMs, only control plane.
Furthermore, the data plane should only be UP on primary CPM as the database is not running on secondary CPM.

X80# show module status reachability
NA = Not Available, DP = Data Plane, CP = Control Plane
cp = Control Processor, ap = Application Processor, np = Network Processor


Slot 13:
Reachablity from np1 via CP ap4 ap5 ap6 ap7 ap10 cp1 cp2
Reachablity from np1 via DP ap4 ap5 ap6 ap7 ap10 cp1
Reachablity from np2 via CP none
Reachablity from np2 via DP none
Reachablity from ap4 via CP np1 ap5 ap6 ap7 ap10 cp1 cp2
Reachablity from ap4 via DP np1 ap5 ap6 ap7 ap10 cp1
Reachablity from ap5 via CP np1 ap4 ap6 ap7 ap10 cp1 cp2
Reachablity from ap5 via DP np1 ap4 ap6 ap7 ap10 cp1
Reachablity from ap6 via CP np1 ap4 ap5 ap7 ap10 cp1 cp2
Reachablity from ap6 via DP np1 ap4 ap5 ap7 ap10 cp1
Reachablity from ap7 via CP np1 ap4 ap5 ap6 ap10 cp1 cp2
Reachablity from ap7 via DP np1 ap4 ap5 ap6 ap10 cp1
Reachablity from ap10 via CP np1 ap4 ap5 ap6 ap7 cp1 cp2
Reachablity from ap10 via DP np1 ap4 ap5 ap6 ap7 cp1
Reachablity from cp1 via CP np1 ap4 ap5 ap6 ap7 ap10 cp2
Reachablity from cp1 via DP np1 ap4 ap5 ap6 ap7 ap10
Reachablity from cp2 via CP np1 ap4 ap5 ap6 ap7 ap10 cp1
Reachablity from cp2 via DP none



CP1 has full connectivity over the Control Plane, but not with the Data Plane:


Slot 13:
Board Type CP8600
Board Part Number 004313
Board Serial Number L811C003
<output removed>
cp1a Link Up
cp1b Link Up
cp1c Link Down
cp1d Link Down

Slot 14:
Board Type CP8600
Board Part Number 004313
Board Serial Number L810C054
<output removed>
cp2a Link Down
cp2b Link Down
cp2c Link Down
cp2d Link Down



This is normal behavior because CP2 is in Standby and doesn't have DP (Data Plane) connectivity, but only CP (Control
Plane).


------------------------ show chassis ------------------------
Chassis Status for X80:

Chassis Part Number: 004360
Chassis Serial Number: G806F006
Chassis Revision: C2
Chassis OCODE: A000
Slot Present Module Name Module Type Status
<output removed>
13 Yes cp1 CP8600 Up
14 Yes cp2 CP8600 Standby