Dcc Connection Lost; Loss Of Ip Communication Between Nodes On An Ospf Lan; Circuits And Timing; Ons 15600 Sdh Switches Timing Reference - Cisco ONS 15600 SDH Troubleshooting Manual

1.7.11 DCC Connection Lost

1.7.11 DCC Connection Lost
Symptom
alarms, such as EOC.
Table 1-16
Table 1-16
Possible Problem
The DCC connection is
lost.

1.7.12 Loss of IP Communication Between Nodes on an OSPF LAN

Symptom
ONS 15600 SDH connected to Router 2 on the same LAN in OSPF backbone Area 0.
Table 1-17
Table 1-17
Possible Problem
The OSPF backbone
Area 0 has segmented
into multiple gateway
network elements
(GNEs_.
A broken link between
two routers on the LAN
in OSPF backbone
Area 0.

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
Table 1-18
Cisco ONS 15600 SDH Troubleshooting Guide, R8.0
1-66
A span between nodes on the network view is gray or the node is reporting DCC termination
describes the potential cause of the symptom and the solution.
DCC Connection Lost
Solution
Clear the EOC alarm and verify the DCC connection as described in the
"EOC" alarm on page
The CTC session on an ONS 15600 SDH connected to Router 1 loses communication with the
describes the potential causes of the symptom and the solutions.
Loss of IP Communication in Segmented OSPF Area
Solution
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.
Timing references switch when one or more problems occur.
describes the potential causes of the symptom and the solutions.
Chapter 1 General Troubleshooting
2-42.
July 2010