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Cisco IOS XR Getting Started Guide
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Chapter3 Bringing Up the Cisco IOS XR Sof tware on a Multishelf System
Integrated Switch System
Verifying Bidirectionality
To verify the bidirection for the integrated switch, you can use the Uni directional Link Detection
(UDLD) protocol to detect unidirectional links on Ethernet ports. UDLD is a Layer 2 proto col. UDLD
is useful at linkup time. If the link is detected to be unidirectional, the port is shut down. In addition,
UDLD detects unidirectional failures after a port has been up and bidirectional for a certain time. If a
transceiver goes wrong, UDLD protects the control network from fa ulty transceivers that are plugged
into the control network.
To provide the port information that is dis abled (UDLD), use the show controllers switch udld ports
command.
Verifying Unidirectional Link Detection (UDLD) Protocol Information
To verify Unidirectional Link Detection (UDLD) protocol information for intra-rack switches, use the
show controllers switch inter-rack udld location command, as shown in the following example:
RP/0/RP0/CPU0:router(admin)# show controllers switch inter-rack udld all location
f0/sc0/cpu0
Interface Gig port# 13
---
…
Current bidirectional state: Bidirectional
Current operational state: Advertisement - Single neighbor detected
…
…
Entry 1
---
…
Device name: 0_RP0_CPU0_Switch
Port ID: GE_Port_0
Neighbor echo 1 device: nodeF0_SC0_CPU0
Neighbor echo 1 port: Gig port# 13
Verifying Spanning Tree Protocol Information
To verify Spanning Tree Protocol (STP) information for intra-rack switches, use the show controllers
switch stp location command, as shown in the following example:
RP/0/RP0/CPU0:router(admin)# show controllers switch stp location f0/sc0/CPU0
##### MST 0 vlans mapped: 2-4094
Bridge address 0800.453e.469a priority 36864 (36864 sysid 0)
Root address 5246.48f0.20ff priority 32768 (32768 sysid 0)
port GE_Port_0 path cost 0
Regional Root address 5246.48f0.20ff priority 32768 (32768 sysid 0)
internal cost 20000 rem hops 3
Operational hello time 1, forward delay 6, max age 8, txholdcount 6
Configured hello time 1, forward delay 6, max age 8, max hops 4
Interface Role Sts Cost Prio.Nbr Type
---------------- ---- --- --------- -------- ---------------------------
##### MST 1 vlans mapped: 1
Bridge address 0800.453e.469a priority 36865 (36864 sysid 1)
Root address 5246.48f0.20ff priority 32769 (32768 sysid 1)
port GE_Port_0 cost 20000 rem hops 3