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Cisco IOS XR Troubleshooting Guide for the Cisco CRS-1 Router
OL-21483-02
Chapter 4 Troubleshooting Router Switch Fabric
Verifying and Troubleshooting the Fabric Plane State
The following output shows Fabric Plane 1 marked as MCAST_DOWN:
RP/0/RP0/CPU0:router(admin)# show controllers fabric plane all detail
Flags: P - plane admin down, p - plane oper down
C - card admin down, c - card oper down
L - link port admin down, l - linkport oper down
A - asic admin down, a - asic oper down
B - bundle port admin Down, b - bundle port oper down
I - bundle admin down, i - bundle oper down
N - node admin down, n - node down
o - other end of link down d - data down
f - failed component downstream
m - plane multicast down
Plane Admin Oper Down Total Down
Id State State Flags Bundles Bundles
------------------------------------------------------
0 UP UP 0 0
1 UP MCAST_DOWN m 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
The fabric plane is operational, but not all destination fabric queue application-specific integrated circuit
(ASICs) can be reached through this fabric plane, as far as the ingress modular services cards (MSCs)
are concerned. Because destinations of multicast traffic cannot be predetermined due to their dynamic
nature, the fabric plane is shown as MCAST_DOWN. Multicast traffic uses the other fabric planes to
deliver data to the appropriate egress MSCs. Unicast traffic continues to use the fabric plane if traffic is
destined to a fabric queue ASIC that is still reachable. If traffic is destined for a fabric queue ASIC that
is deemed unreachable, the other available fabric plane is used instead of the plane in the
MCAST_DOWN state. To change the operational state of a fabric plane from MCAST_DOWN to up,
contact Cisco Technical Support. See the “Obtaining Documentation and Submitting a Service Request”
section on page viii in the Preface.
The following output shows Fabric Plane 0 as administratively shut down:
RP/0/RP0/CPU0:router(admin)# show controllers fabric plane all detail
Flags: P - plane admin down, p - plane oper down
C - card admin down, c - card oper down
L - link port admin down, l - linkport oper down
A - asic admin down, a - asic oper down
B - bundle port admin Down, b - bundle port oper down
I - bundle admin down, i - bundle oper down
N - node admin down, n - node down
o - other end of link down d - data down
f - failed component downstream
m - plane multicast down
Plane Admin Oper Down Total Down
Id State State Flags Bundles Bundles
------------------------------------------------------
0 DOWN DOWN P 0 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
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