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Cisco ONS 15600 SDH Troubleshooting Guide, R8.0
July 2010
Chapter 1 General Troubleshooting
1.7.11 DCC Connection Lost
1.7.11 DCC Connection Lost
Symptom
A span between nodes on the network view is gray or the node is reporting DCC termination
alarms, such as EOC.
describes the potential cause of the symptom and the solution.
1.7.12 Loss of IP Communication Between Nodes on an OSPF LAN
Symptom
The CTC session on an ONS 15600 SDH connected to Router 1 loses communication with the
ONS 15600 SDH connected to Router 2 on the same LAN in OSPF backbone Area 0.
describes the potential causes of the symptom and the solutions.
1.8 Circuits and Timing
This section provides solutions to circuit creation and reporting errors, as well as common timing
reference errors and alarms.
1.8.1 ONS 15600 SDH Switches Timing Reference
Symptom
Timing references switch when one or more problems occur.
describes the potential causes of the symptom and the solutions.
Table 1-16
DCC Connection Lost
Possible Problem
Solution
The DCC connection is
lost.
Clear the EOC alarm and verify the DCC connection as described in the
Table 1-17
Loss of IP Communication in Segmented OSPF Area
Possible Problem
Solution
The OSPF backbone
Area 0 has segmented
into multiple gateway
network elements
(GNEs_.
If multiple ONS 15600 SDH nodes and routers are connected to the same
LAN in OSPF backbone Area 0 and a link between two routers breaks, the
backbone OSPF area 0 could divide into multiple GNEs. If this occurs, the
CTC session on the ONS node connected to Router 1 will not be able to
communicate with the ONS 15600 SDH connected to Router 2. This is
standard behavior for an OSPF network.
To resolve this problem, you must repair the link between the routers or
provide another form of redundancy in the network. Refer to the
Cisco ONS 15600 SDH Procedure Guide
for procedures to repair the link
between the routers.
A broken link between
two routers on the LAN
in OSPF backbone
Area 0.
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