Brocade Communications Systems Brocate Ethernet Access Switch 6910 User Manual
Page 1016
966
Brocade 6910 Ethernet Access Switch Configuration Guide
53-1002581-01
Ethernet Ring Protection Switching
42
•
WTR Timer – The wait-to-restore timer is used to verify that the ring has stabilized before
blocking the RPL after recovery from a signal failure. (Range: 5-12 minutes)
If the switch goes into ring protection state due to a signal failure, after the failure condition is
cleared, the RPL owner will start the wait-to-restore timer and wait until it expires to verify that
the ring has stabilized before blocking the RPL and returning to the Idle (normal operating)
state.
•
Control VLAN – A dedicated VLAN used for sending and receiving R-APS protocol messages.
(Range: 1-4093)
Configure one control VLAN for each ERPS ring. First create the VLAN to be used as the control
VLAN (see
on page 722), add the ring ports for the east and west
interface as tagged members to this VLAN (see
“Adding Static Members to VLANs”
page 724), and then use this parameter to add it to the ring.
The following restrictions are recommended to avoid creating a loop in the network or other
problems which may occur under some situations:
•
The Control VLAN must not be configured as a Layer 3 interface (with an IP address), a
dynamic VLAN (with GVRP enabled), nor as a private VLAN.
•
In addition, only ring ports may be added to the Control VLAN. No other ports can be
members of this VLAN.
•
Also, the ring ports of the Control VLAN must be tagged.
Once the ring has been activated, the configuration of the control VLAN cannot be modified.
Use the Admin Status parameter to stop the ERPS ring before making any configuration
changes to the control VLAN.
•
Non-ERPS Device Protection – Sends non-standard health-check packets when an owner node
enters protection state without any link down event having been detected through Signal Fault
messages. (For more information on this feature, refer to the
command.
•
Propagate TC – Enables propagation of topology change messages from a secondary ring to
the primary ring. (Default: Disabled)
When a secondary ring detects a topology change, it can pass a message about this event to
the major ring. When the major ring receives this kind of message from a secondary ring, it can
clear the MAC addresses on its ring ports to help the second ay ring restore its connections
more quickly through protection switching.
When the MAC addresses are cleared, data traffic may flood onto the major ring. The data
traffic will become stable after the MAC addresses are learned again. The major ring will not be
broken, but the bandwidth of data traffic on the major ring may suffer for a short period of time
due to this flooding behavior.
•
Sub Domain – A secondary ERPS ring which uses this primary ring for sending control packets.
•
Major Domain – The ERPS ring used for sending control packets.
This switch can support up to two rings. However, ERPS control packets can only be sent on
one ring. This parameter is used to indicate that the current ring is a secondary ring, and to
specify the major ring which will be used to send ERPS control packets.
The Ring Protection Link (RPL) is the west port and can not be configured. So the physical port
on a secondary ring must be the west port. In other words, if a domain has two physical ring
ports, this ring can only be a major ring, not a secondary ring (or sub-domain) which can have
only one physical ring port. The major domain therefore cannot be set if the east port is already
configured.