LevelOne GTL-2691 User Manual
Page 466
C
HAPTER
14
| Basic Administration Protocols
Ethernet Ring Protection Switching
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Configuration Guidelines for ERPS
1.
Create an ERPS ring (
): The ring name is used
as an index in the G.8032 database.
2.
Configure the east and west interfaces (
): Each node on the ring connects to it through two ring ports.
Configure one port connected to the next node in the ring to the east
(or clockwise direction) and another port facing west in the ring.
3.
Configure the RPL owner (
Configure Domain – Configure Details
Configure one node in the ring as the Ring Protection Link (RPL) owner.
When this switch is configured as the RPL owner, the west ring port is
set as being connected to the RPL. Under normal operations (Idle
state), the RPL is blocked to ensure that a loop cannot form in the ring.
If a signal failure brings down any other link in the ring, the RPL will be
unblocked (Protection state) to ensure proper connectivity among all
ring nodes until the failure is recovered.
4.
Configure ERPS timers (
Configure Domain – Configure Details
): Set the
Guard timer to prevent ring nodes from receiving outdated R-APS
messages, the Hold-off timer command to filter out intermittent link
faults, and the WTR timer command to verify that the ring has
stabilized before blocking the RPL after recovery from a signal failure.
5.
Configure the ERPS Control VLAN (
): Specify the control VLAN (CVLAN) used to pass R-APS ring
maintenance commands. The CVLAN must NOT be configured with an
IP address. In addition, only ring ports may be added to the CVLAN
(prior to configuring the VLAN as a CVLAN). No other ports can be
members of this VLAN (once set as a CVLAN). Also, the ring ports of the
CVLAN must be tagged. Failure to observe these restrictions can result
in a loop in the network.
6.
Enable ERPS (
): Before enabling a ring as described in
the next step, first globally enable ERPS on the switch. If ERPS has not
yet been enabled or has been disabled, no ERPS rings will work.
7.
Enable an ERPS ring (
Configure Domain – Configure Details
): Before an
EAPS ring can work, it must be enabled. When configuration is
completed and the ring enabled, R-APS messages will start flowing in
the control VLAN, and normal traffic will begin to flow in the data
VLANs. A ring can be stopped by disabling the Admin Status on any
node.
8.
Display ERPS status information (
): Display
ERPS status information for all configured rings.
Configuration Limitations for ERPS
The following configuration limitations apply to ERPS:
◆
One switch only supports two ERPS rings – each ring must have one
Control VLAN, and at most 255 Data VLANs.