D-Link DGS-1510/ME Series Reference Manual page 225

DGS-1510/ME Series Metro Ethernet Switch CLI Reference Guide
26-5 config erps raps_vlan
Description
This command is used to configure the ERPS R-APS VLAN settings.
The ring MEL is one field in the R-APS PDU. Note that if CFM (Connectivity Fault Management) and ERPS are
used at the same time, the R-APS PDU is one of a suite of Ethernet OAM PDU. The behavior for forwarding of R-
APS PDU should follow the Ethernet OAM. If the MEL of R-APS PDU is not higher than the level of the MEP with
the same VLAN on the ring ports, the R-APS PDU cannot be forwarded on the ring.
Restrictions apply for ports that are included in a link aggregation group. A link aggregation group can be
configured as a ring port by specifying the master port of the link aggregation port. Only the master port can be
specified as a ring port. If the specified link aggregation group is eliminated, the master port retains its ring port
status. If the ring port configured on virtual channel, the ring which the port connects to will be considered as a sub-
ring.
RPL port - Specifies one of the R-APS VLAN ring ports as the RPL port. To remove an RPL port from an R-APS
VLAN, use the none designation for rpl_port.
RPL owner - Specifies the node as the RPL owner.
Note that the virtual channel cannot be configured as RPL. For example, if a ring port is configured on the virtual
channel and the ring port is configured as an RPL port, an error message will be display and the configuration will
fail.
The R-APS VLAN cannot be the protected VLAN. The protected VLAN can be one that has already been created,
or it can be used for a VLAN that has not yet been created.
Hold-off timer - The Hold-off timer is used to filter out intermittent link faults when link failures occur during the
protection switching process. When a ring node detects a link failure, it will start the hold-off timer and report the
link failure event (R-APS BPDU with SF flag) after the link failure is confirmed within period of time specified.
Guard timer - Guard timer is used to prevent ring nodes from receiving outdated R-APS messages. This timer is
used during the protection switching process after the link failure recovers. When the link node detects the
recovery of the link, it will report the link failure recovery event (R-APS PDU with NR flag) and start the guard timer.
Before the guard timer expires, all received R-APS messages are ignored by this ring node, except in the case
where a burst of three R-APS event messages that indicates the topology of a sub-ring has changed and the node
needs to flush FDB are received on the node. In this case the recovered link does not go into a blocking state. The
Guard Timer should be greater than the maximum expected forwarding delay for which one R-APS message
circles around the ring.
WTR timer - WTR timer is used to prevent frequent operation of the protection switch due to an intermittent defect.
This timer is used during the protection switching process when a link failure recovers. It is only used by the RPL
owner. When the RPL owner in protection state receives R-APS PDU with an NR flag, it will start the WTR timer.
The RPL owner will block the original unblocked RPL port and start to send R-APS PDU with an RB flag after the
link recovery is confirmed within this period of time.
Revertive mode- When revertive is enabled, the traffic link is restored to the working transport link. When revertive
is disabled, the traffic link is allowed to use the RPL, after recovering from a failure.
When both the global state and the specified ring ERPS state are enabled, the specified ring will be activated. STP
and LBD should be disabled on the ring ports before the specified ring is activated.
The ring cannot be enabled before the R-APS VLAN is created, and ring ports, RPL port, RPL owner, are
configured. Note that these parameters cannot be changed when the ring is activated.
In order to guarantee correct operation, the following integrity will be checked when the ring is enabled and the
global ERPS state is enabled.
1. R-APS VLAN is created.
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