Nokia 7330 - Sample Configuration; Services Overview

FD 100/320Gbps NT and FX NT IHub Services Guide Services Overview
Issue: 13 3HH-11985-AAAA-TQZZA 67
Ethernet R-APS can be configured on any port configured for access or hybrid mode
using dot1q encapsulation enabling support for Ethernet RAPS protected services
on the service edge towards the customer site, or within the Ethernet backbone. The
intention of this is to cause minimum disruption to the service during Ethernet RAPS
failure detection and recovery.
In the ISAM implementation the Ethernet Ring is built from a VPLS (or v-VPLS)
service on each node with VPLS SAPs that provides Ring path with SAPs. As a
result, most of the VPLS SAP features are available on Ethernet rings if desired. This
results in a fairly feature rich ring service.
The control tag defined under each eth-ring is used for encapsulating and forwarding
the CCMs and the G.8032 messages used for the protection function. If a failure of
a link or node affects an active Ethernet ring segment, the services will fail to receive
the CC messages exchanged on that segment or will receive a fault indication from
the Link Layer OAM module.
For fault detection using CCMs three CC messages plus a configurable hold-off timer
must be missed for a fault to be declared on the associated path. The latter
mechanism is required to accommodate the existence of additional, 50 ms resiliency
mechanism in the optical layer. After it receives the fault indication, the protection
module will declare the associated ring link down and the G.8032 state machine will
send the appropriate messages to open the RPL and flush the learned addresses.
Flushing is triggered by the G.8032 state machine and the ISAM implementation
allows flooding of traffic during the flushing interval to expedite traffic recovery.
3.11.2 Sample configuration
Configuring eth-ring instance and paths:
configure eth-ring 1
description "RPL owner mode"
revert-time 100
guard-time 5
ccm-hold-time down 100 up 200
rpl-node owner
path a nt-a:xfp:1 raps-tag 100
description "To A ring link"
eth-cfm
mep 1 domain 1 association 1
control-mep
ccm-enable
no shutdown
exit
exit
no shutdown
exit
path b lag-10 raps-tag 100
description "to B Ring Link"
eth-cfm
mep 2 domain 1 association 2
control-mep
ccm-enable