If the reply mode command is used in IP SLA operation mode, it sets the reply mode of echo reply packets
for the specific operation being configured. If the reply mode command is used in IP SLA MPLS LSP monitor
mode, it sets the reply mode of echo reply packets for all operations associated with the monitored provider
edge (PE) routers. This configuration is inherited by all LSP operations that are created automatically.
The router-alert reply mode forces an echo reply packet to be specially handled by the transit LSR router at
each intermediate hop as it moves back to the destination. Because this reply mode is more expensive, it is
recommended only if the headend router does not receive echo replies using the default reply mode.
Task ID
OperationsTask ID
read, writemonitor
Examples
The following example shows how to use the reply mode command with the router-alert keyword:
RP/0/0/CPU0:router# configure
RP/0/0/CPU0:router(config)# ipsla
RP/0/0/CPU0:router(config-ipsla)# operation 1
RP/0/0/CPU0:router(config-ipsla-op)# type mpls lsp trace
RP/0/0/CPU0:router(config-ipsla-mpls-lsp-trace)# reply mode router-alert
The following example shows how to use the reply mode command with the control-channel keyword:
RP/0/0/CPU0:router# configure
RP/0/0/CPU0:router(config)# ipsla
RP/0/0/CPU0:router(config-ipsla)# operation 1
RP/0/0/CPU0:router(config-ipsla-op)# type mpls lsp ping
RP/0/0/CPU0:router(config-ipsla-mpls-lsp-ping)# target pseudowire 192.168.1.4 4211
RP/0/0/CPU0:router(config-ipsla-mpls-lsp-ping)# reply mode control-channel
Related Commands
DescriptionCommand
Configures an IP SLA operation.operation, on page 174
Schedules an IP SLA operation.schedule operation, on page 215
Tests connectivity in an LSP path in an MPLS VPN.type mpls lsp ping, on page 286
Traces the hop-by-hop route of an LSP path in an
MPLS VPN.
type mpls lsp trace, on page 288
Cisco IOS XR System Monitoring Command Reference for the Cisco XR 12000 Series Router, Release 4.1
208 OL-24735-01
IP Service Level Agreement Commands
reply mode
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