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Cisco ONS 15600 Reference Manual, R7.2
Chapter 7 Circuits and Tunnels
7.10 Automatic Circuit Routing
SONET J0 section trace is not supported on ONS 15600 cards
The ONS 15600 supports both automatic and manual J1 path trace monitoring to detect and report the
contents of the 64-byte STS path trace message (nonterminated) for the designated STS path.
•
Automatic—The receiving port assumes that the first J1 string it receives is the baseline J1 string.
•
Manual—The receiving port uses a string that you manually enter as the baseline J1 string.
Note
When J1 path trace is enabled on a two-fiber BLSR circuit, CTC will not retrieve the path trace
information from the card view Maintenance > Path Trace subtab.
7.10 Automatic Circuit Routing
If you select automatic routing during circuit creation, CTC routes the circuit by dividing the entire
circuit route into segments based on protection domains. For unprotected segments of circuits
provisioned as fully protected, CTC finds an alternate route to protect the segment, creating a virtual
path protection. Each segment of a circuit path is a separate protection domain. Each protection domain
is protected in a specific protection scheme including card protection (1+1) or SONET topology (path
protection or BLSR).
The following list provides principles and characteristics of automatic circuit routing:
•
Circuit routing tries to use the shortest path within the user-specified or network-specified
constraints.
•
If you do not choose fully path protected during circuit creation, circuits can still contain protected
segments. Because circuit routing always selects the shortest path, one or more links and/or
segments can have some protection. CTC does not look at link protection while computing a path
for unprotected circuits.
•
Circuit routing does not use links that are down. If you want all links to be considered for routing,
do not create circuits when a link is down.
•
Circuit routing computes the shortest path when you add a new drop to an existing circuit. It tries to
find the shortest path from the new drop to any nodes on the existing circuit.
Table 7-6 ONS 15600 Cards Supporting J1 Path Trace
Card Receive Transmit
OC48/STM16 SR/SH 16 Port 1310 Yes No
OC48/STM16 LR/LH 16 Port 1550 Yes No
OC192/STM64 SR/SH 4 Port 1310 Yes No
OC192/STM64 LR/LH 4 Port 1550 Yes No
ASAP OC-N ports Yes No
ASAP Ethernet ports Yes Yes