Cisco Systems Cisco IOS XR manual Verify that the Links are Not Unidirectional

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

Configuring the External Cisco Catalyst 6509 Switches

The listed interfaces should include the port to which you have connected. If the port is not listed, contact Cisco Technical Support. For contact information, see the “Obtaining Technical Assistance” section on page xiv.

CAT6k-1#show spanning-tree

MST00

Spanning tree enabled protocol mstp

Root ID Priority 0

Address 0013.1a4f.75c0

This bridge is the root

Hello Time 1 sec Max Age 8 sec Forward Delay 6 sec

Bridge ID Priority 0 (priority 0 sys-id-ext 0)

Address 0013.1a4f.75c0

Hello Time 1 sec Max Age 8 sec Forward Delay 6 sec

Interface Role Sts Cost Prio.Nbr Type

---------------- ---- --- --------- -------- --------------------------------

Gi1/1 Desg FWD	20000	128.1	P2p
Gi1/2 Desg FWD	20000	128.2	P2p
Gi1/3 Desg FWD	20000	128.3	P2p
Gi1/4 Desg FWD	20000	128.4	P2p
Gi1/5 Desg FWD	20000	128.5	P2p
Gi1/6 Desg FWD	20000	128.6	P2p
MST01
Spanning tree enabled protocol				mstp
Root ID Priority 1
Address 0013.1a4f.75c0
This bridge is the root
Hello Time 1 sec Max		Age 8 sec		Forward Delay 6 sec
Bridge ID Priority 1		(priority		0 sys-id-ext 1)
Address 0013.1a4f.75c0
Hello Time 1 sec Max		Age 8 sec		Forward Delay 6 sec
Interface Role Sts Cost Prio.Nbr Type

---------------- ---- --- --------- -------- --------------------------------

Gi1/1 Desg FWD 20000 128.1 P2p

Gi1/2 Desg FWD 20000 128.2 P2p

Gi1/3 Desg FWD 20000 128.3 P2p

Gi1/4 Desg FWD 20000 128.4 P2p

Gi1/5 Desg FWD 20000 128.5 P2p

Gi1/6 Desg FWD 20000 128.6 P2p

CAT6k-1#

Verify that the Links are Not Unidirectional

After an LCC or FCC is brought up, verify that the Catalyst links are operating correctly. If a link has a partial fiber cut or a bad optic, the control Ethernet network can become unidirectional and cause a loop.

To verify the links in a Catalyst switch using the Cisco IOS software, enter the command show interface in EXEC mode.

In the following example, the command is entered for a specific port. The keywords inc Gig narrows the output to Gigabit Ethernet ports.

Router# show interface gi 6/1 inc Gig

GigabitEthernet6/1 is up, line protocol is up (connected)

	Cisco IOS XR Getting Started Guide
OL-10957-02		3-19