17-28
Cisco ONS 15454 and Cisco ONS 15454 SDH Ethernet Card Software Feature and Configuration Guide, R8.0
Chapter 17 Configuring Cisco Proprietary Resilient Packet Ring
Understanding Cisco Proprietary RPR Link Fault Propagation
Step 28
Complete the following Cisco IOS configuration on the Adjacent Node 2 ML-Series card, beginning in
global configuration mode:
Step 29
Use a test set to verify that Ethernet connectivity exists on the Cisco proprietary RPR.
Step 30
Monitor Ethernet traffic and routing tables for at least one hour after the node deletion.
Stop. You have completed this procedure.
Understanding Cisco Proprietary RPR Link Fault Propagation
Link fault propagation (LFP), also known as link pass-through, decreases convergence times in networks
where routers interconnect through ML-Series card Cisco proprietary RPRs. It quickly relays link faults
from a master Gigabit Ethernet link to a remote slave link, either Gigabit Ethernet or Fast Ethernet. LFP
greatly improves the time it takes for a router connected to the slave link to fail over to an alternate path.
Under normal protection schemes, convergence might take as long as forty seconds. Using LFP, the slave
interface reflects the state of the master interface in less than a second. This feature is often used to
enable a link failure at a far-end hub site in order to trigger a link down state at a near-end access site.
Figure 17-13 illustrates LFP.
a.
Router(config)# interface pos
interface-number
Enters interface configuration mode for the POS port at one
endpoint of the second newly created circuit.
b.
Router(config-if)# no shutdown
Enables the port.
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