This document describes the procedure to upgrade a point-to-point (1+1)
configuration (with two nodes) to a two-fiber bidirection line switched ring
(BLSR) in an ONS 15454 network.
Cisco recommends that you have knowledge of these topics:
The information in this document is based on these software and
The information in this document was created from the devices in a
specific lab environment. All of the devices used in this document started with
a cleared (default) configuration. If your network is live, make sure that you
understand the potential impact of any command.
Technical Tips Conventions for more information on document
This document uses a lab setup with two nodes (Node1 and Node2) (see
Figure 1 – Topology
The current setup is a point-to-point (1+1) configuration. The line
capacity is OC-48. The working/active and protect/standby ports reside on slot
5 and slot 6 respectively (see Figure
Figure 2 – Point-to-Point (1+1)
There are currently two circuits (see Figure
Figure 3 – Two Circuits
Complete these steps in order to convert a point-to-point (1+1)
configuration to a two-fiber BLSR ring:
Log into one of the two nodes.
Check the Alarms and Conditions
tabs to ensure that there are no active alarms or conditions for the network.
Resolve any network-related alarms before you proceed.
Click the Circuits tab (see arrow A in
Figure 4 – Export CTC Data: Circuits
Export the CTC (circuits) data for reference, because you need to
delete some circuits and create those circuits again later. Complete these
Select File > Export (see arrow B in
Select a data format in the EXPORT dialog box (see
Figure 5). You have three options:
Figure 5 – EXPORT Dialog Box
As HTML—This option saves the data as a simple HTML table file
without graphics. You can view or edit the file with applications such as
Netscape Navigator, Microsoft Internet Explorer, or other applications that
have the capability to open HTML files.
As CSV—This option saves the CTC table as comma-separated
As TSV—This option saves the CTC table as tab-separated values
Navigate to a directory where you want to store the file.
Right-click a span adjacent to the logged in node, and click
Circuits from the shortcut menu (see Figure 6).
Figure 6 – Select Circuits from the Shortcut Menu
The Circuits on Span window appears (see Figure 7).
Figure 7 – Circuits on Span
Ensure that the total number of active Synchronous Transport Signal
(STS) circuits does not exceed 50 percent of the span bandwidth. Use the
circuit list that you exported in Step 4 to note any circuits that fall into
the upper 50 percent of bandwidth on the span. You need to delete these
circuits and create them again later in the procedure.
In the Circuit column, a block titled Unused
appears (see Figure 7). This number must exceed 50
percent of the span bandwidth. For an OC-48, you must not provision more than
24 STSs on the span. For an OC-12, you must not provision more than 6 STSs on
Repeat Steps 3 and 4 for each node involved in the point-to-point
to BLSR conversion.
Ensure that the 1+1 working slot is active at both ends of the span
that you want to convert to BLSR. Note down which slots work, and the protect
port for reference in Step 12. Complete these steps:
Click Maintenance > Protection in the Node
Verify whether the working slot/port in the Selected Group pane
appears as Working/Active under the Selected Group section (see
Delete a protection group at each node that supports the
point-to-point span. Complete these steps:
Click the Provisioning > Protection tabs in
the Node view.
Select the protection group you want to delete, and click
Delete (see Figure
Figure 8 – Delete a Protection Group
Click Yes in the Delete Protection Group
confirmation message box.
Figure 9 – Delete Protection Group
Repeat Steps (a) through (d) to delete the protection group at
each end of the span.
Verify the fiber from the protect port on one end node to the
protect port on the other end node.
Create SONET Data Communication Channel (SDCC) terminations on the
previous Protect slots that you noted in Step 8. On both node 1 and node 2,
execute this procedure:
Click Circuits > DCC/GCC in the Node view
(see Figure 10).
Figure 10 – Create SDCC Terminations
Click Create. The Create SDCC Terminations
dialog box appears (see Figure
Figure 11 – Create SDCC Terminations Dialog
Click the ports for SDCC termination. In order to select more
than one port, press the SHIFT key or the CTRL key.
Click the Set to IS radio button in the Port
State area (see arrow A in Figure
Ensure that the Disable OSPF on DCC Link check
box is not checked (see arrow B in Figure
Click OK (see arrow C in Figure
For circuits you provisioned on an STS that is now part of the
protection bandwidth (STSs 7 to 12 for an OC12 BLSR, STSs 25 to 48 for an OC-48
BLSR, and STSs 97 to 192 for an OC-192 BLSR), delete each circuit. Refer to the
notations on the circuit list from Step 6.
Note: Deletion of circuits can affect service.
Select Provisioning > BLSR in the network view,
and click Create BLSR (see Figure
Figure 12 – BLSR Creation
Set the BLSR properties in the BLSR Creation dialog box (see
Figure 13 – BLSR Attributes
Ring Type: Choose the BLSR ring type, either
two-fiber or four-fiber.
Speed: Choose the BLSR ring
Ring ID: Assign a ring ID. The value must be
between 0 and 9999.
Reversion time (Ring Reversion or Span
Reversion): Set the amount of time to pass before the traffic reverts to the
original working path after a ring switch. The default value is 5
Click Next. The network graphic appears (see
Figure 14 – BLSR Topology
Double-click a BLSR span line in the network graphic. If the span
line is DCC connected to other BLSR cards that constitute a complete ring, the
lines turn blue and the Finish button appears. If the lines do
not form a complete ring, double-click span lines until a complete ring
Click Finish to complete the two fiber BLSR
creation. The BLSR appears (see Figure
Figure 15 – Verification of 2 Fiber BLSR
Recreate the circuits that you deleted in step
In the network view, click Circuits. Under the
Protection column, both circuits show 2F-BLSR (see Figure 16). Before the conversion, both circuits show
1+1 (see Figure 3).
Figure 16 – Circuits