Cisco CRS-1 - Carrier Routing System Router Migration Guide

2-24
Cisco CRS-1 Carrier Routing System to Cisco CRS-3 Carrier Routing System Migration Guide
OL-13669-03
Chapter 2 Downgrading Your Cisco CRS-3 Carrier Routing System Router Back to a Cisco CRS-1 Carrier Routing
System Router
Downgrading your Cisco CRS-3 Carrier Routing System 8-Slot Line Card Chassis Back to a Cisco CRS-1 Carrier Routing
System 8-Slot Line Card Chassis
• To avoid traffic loss, you must downgrade the switch fabric one plane at a time. To do that, you must
replace each FC-140G/S card with an FC/S card and restore service to that fabric plane before
downgrading the next fabric plane.
• You might want to perform the downgrade during a network maintenance window or when system
traffic is light.
Note Be sure to review the downgrade procedures before deciding when to schedule the
downgrade. That way, you can familiarize yourself with the downgrade procedure and
determine if there are other issues to consider before performing the downgrade.
• We recommend against moving a chassis after it is cabled. Before the fabric cables are installed, the
chassis should be fully installed with power supplies, console cables, grounded, and so forth
Administratively Disabling the Fabric Plane
Please note that these steps are to be performed for each Fabric Card one at a time. When one Fabric
Node has completed the downgrade process we should come back to this step for the next Fabric Node,
until all 8 Fabrics have been downgraded.
As a first step in the downgrade process, we administratively shutdown the fabric plane that is to be
downgraded. This takes the fabric out of traffic operation, the router now continues to forward traffic on
the remaining 7 planes – there should not be any traffic drop.
RP/0/RP0/CPU0:router#admin
RP/0/RP0/CPU0:router(admin)#config
RP/0/RP0/CPU0:router(admin-config)#controller fabric plane 0 shut
RP/0/RP0/CPU0:router(admin-config)#commit
Verify that fabric plane is now Admin-state Down.
RP/0/RP0/CPU0:router(admin)#show controllers fabric plane all
Plane Admin Oper up->dn up->mcast
Id State State counter counter
---------------------------------------------
0 DOWN DOWN 1 0
1 UP UP 0 0
2 UP UP 0 0
3 UP UP 0 0
4 UP UP 0 0
5 UP UP 0 0
6 UP UP 0 0
7 UP UP 0 0
Power Disable the Fabric Card
Next, we disable power to the Fabric node, and verify that node is moved to “UNPOWERED” state.
RP/0/RP0/CPU0:router#admin
RP/0/RP0/CPU0:router(admin)#config
RP/0/RP0/CPU0:router(admin-config)#hw-module power disable loc 0/SM0/SP
RP/0/RP0/CPU0:router(admin-config)#commit

Cisco CRS-1 - Carrier Routing System Router Specifications

General

Brand	Cisco
Model	CRS-1 - Carrier Routing System Router
Category	Network Router
Language	English