Cisco Systems 15454M6DC Manual De Usuario
5-39
Cisco ONS 15454 Installation and Operations Guide
November 2001
Chapter 5 SONET Topologies
Subtending Rings
c.
Click Apply.
d.
Repeat steps a – c for the second BLSR trunk card.
Step 9
Use the
to configure the BLSR.
Step 10
Follow Steps 1– 8 for the other nodes that will be in the BLSR.
Step 11
Go to the network view to see the subtending ring.
The ONS 15454 can support two BLSRs on the same node. This capability allows you to deploy an ONS
15454 in applications requiring SONET DCSs (digital cross connect systems) or multiple SONET
ADMs (add/drop multiplexers).
15454 in applications requiring SONET DCSs (digital cross connect systems) or multiple SONET
ADMs (add/drop multiplexers).
runs on Nodes 4, 5, 6, and 7. Two BLSR rings, Ring 1 and Ring 2, are provisioned on Node 4. Ring 1
uses cards in Slots 5 and 12, and Ring 2 uses cards in Slots 6 and 13.
uses cards in Slots 5 and 12, and Ring 2 uses cards in Slots 6 and 13.
Note
Although different node IDs are used for the two BLSRs shown in
, nodes in different
BLSRs can use the same node ID.
Figure 5-30 A BLSR subtending from a BLSR
After subtending two BLSRs, you can route circuits from nodes in one ring to nodes in the second ring.
For example in
For example in
, you can route a circuit from Node 1 to Node 7. The circuit would normally
travel from Node 1 to Node 4 to Node 7. If fiber breaks occur, for example between Nodes 1 and 4 and
Nodes 4 and 7, traffic is rerouted around each ring: in this example, Nodes 2 and 3 in Ring 1 and Nodes
5 and 6 in Ring 2.
Nodes 4 and 7, traffic is rerouted around each ring: in this example, Nodes 2 and 3 in Ring 1 and Nodes
5 and 6 in Ring 2.
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Node 5
Slot 6
West
East
Slot 13
Slot 13
Node 7
Slot 13
East
Slot 6
West
West
Slot 6
West
Slot 13
East
Node 6
Node 1
Slot 5
West
Slot 5
West
West
Slot 12
East
East
Slot 12
East
East
Node 3
Slot 12
East
Slot 5
West
West
Node 2
Slot 5
West
Slot 12
East
Slot 13
East
East
Slot 6
West
West
Node 4
BLSR
Ring 1
BLSR
Ring 2