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xStack® DGS-3420 Series Layer 2 Managed Stackable Gigabit Switch CLI Reference Guide
315
29-5 config erps raps_vlan
Description
This command is used to set the R-APS VLAN parameters. The ring_mel command is used to
configure the ring MEL for an R-APS VLAN. 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, 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 ring MEL is not higher than the highest MEL of the MEPs on the ring ports,
the R-APS PDU cannot be forwarded on the ring.
The ring_port command is used to configure the port that participates in the ERPS 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 is configured on a virtual channel, the ring
that the port is connected to will be considered as a sub-ring.
Note that modifying the ring port number may not take effect immediately when ERPS function is
enabled. The ring will run the old configuration’s protocol if the follow conditions are not met:
1. The Ring port is a tagged member port of the R-APS VLAN.
2. The RPL port is not virtual channel.
3. The Ring port is the master port if it belongs to a link aggregation group.
The rpl command is used to configure the RPL port and the RPL owner.
• 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 modifying the RPL port and RPL owner may not take effect immediately when the ERPS
function is enabled. The ring will run the old configuration’s protocol if the following conditions are
not met:
1. The RPL port is specified if the RPL owner is enabled.
2. The RPL port is not virtual channel.
The protected_vlan command is used to configure the VLANs that are protected by the ERPS
function. 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.
The timer commands are used to configure the protocol timers:
Holdoff timer - Hold-off timer is used to filter out intermittent link faults when link failure occurs.
This timer is used during the protection switching process when link failure occurs. When a ring
node detects a link’s failure, it will start the hold off timer. It will report the link failure event (R-APS
BPDU with SF flag) after the link failure is confirmed within this period of time.
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 when link failure recovers.