Specifications

5-15
Cisco ONS 15454 Installation and Operations Guide, R3.2
March 2002
Chapter 5 SONET Topologies
Bidirectional Line Switched Rings
Procedure: Provision the BLSR
Step 1 Log into one BLSR node.
Step 2 Select the Provisioning > Ring tabs.
Step 3 Click Create.
Step 4 On the Create BLSR dialog box (Figure 5-15), set the BLSR properties:
• Ring Type—select the BLSR ring type, either two-fiber or four-fiber.
• Ring ID—Assign a ring ID (a number between 0 and 9999). Nodes in the same BLSR must have the
same Ring ID.
• Node ID—Assign a Node ID. The Node ID identifies the node to the BLSR. Nodes in the same
BLSR must have unique Node IDs.
• Ring Reversion—Set the amount of time that will pass before the traffic reverts to the original
working path. The default is 5 minutes. All nodes in a BLSR ring should have the same ring
reversion setting, particularly if “never” (i.e., non-revertive) is selected.
• West Port—Assign the west BLSR port for the node from the pull-down menu. (In Figure 5-12, this
is Slot 5.)
• East Port—Assign the east BLSR port for the node from the pull-down menu. (In Figure 5-12, this
is Slot 12.)
The east and west ports must match the fiber connections and DCC terminations set up in the “Install
the BLSR Trunk Cards” procedure on page 5-11 and the “Create the BLSR DCC Terminations”
procedure on page 5-13.
For four-fiber BLSRs, complete the following:
• Span Reversion—Set the amount of time that will pass before the traffic reverts to the original
working path following a span reversion. The default is 5 minutes. Span reversions can be set to
Never. If you set a ring reversion time, the times must be the same for both ends of the span. That
is, if Node A’s west fiber is connected to Node B’s east port, the Node A west span reversion time
must be the same as the Node B east span reversion time. To avoid reversion time mismatches, Cisco
recommends that you use the same span reversion time throughout the ring.
• West Protect—Assign the west BLSR port that will connect to the west protect fiber from the
pull-down menu. (In Figure 5-13, this is Slot 6.)
• East Protect—Assign the east BLSR port that will connect to the east protect fiber from the
pull-down menu. (In Figure 5-13, this is Slot 13.)
Figure 5-15 Setting BLSR properties
Step 5
Click OK.