Figure 279 e – Brocade Communications Systems Brocate Ethernet Access Switch 6910 User Manual
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Brocade 6910 Ethernet Access Switch Configuration Guide
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Ethernet Ring Protection Switching
42
FIGURE 279
ERPS Ring Components
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 (
Configure Domain – Configure Details
): 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ring nodes from receiving outdated R-APS messages, the Hold-off timer command to filter out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 (
Configure Domain – Configure Details
): 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 ERPS 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.
East Port
West Port
RPL Owner
CC Messages
RPL
x
CC Messages
(Idle State)