
11-27
Cisco ONS 15454 Reference Manual, R8.5
78-18106-01
Chapter 11 Circuits and Tunnels
11.15 Automatic Circuit Routing
11.15 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 configuration. 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, 1:1, etc.) or SONET
topology (path protection, BLSR, etc.).
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. VT tunnels are preferable for VT circuits because VT tunnels are considered shortcuts
when CTC calculates a circuit path in path-protected mesh networks.
•
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.
0xEA
STS-1 with 10 VTx PDs
0xEB
STS-1 with 11 VTx PDs
0xEC
STS-1 with 12 VTx PDs
0xED
STS-1 with 13 VTx PDs
0xEE
STS-1 with 14 VTx PDs
0xEF
STS-1 with 15 VTx PDs
0xF0
STS-1 with 16 VTx PDs
0xF1
STS-1 with 17 VTx PDs
0xF2
STS-1 with 18 VTx PDs
0xF3
STS-1 with 19 VTx PDs
0xF4
STS-1 with 20 VTx PDs
0xF5
STS-1 with 21 VTx PDs
0xF6
STS-1 with 22 VTx PDs
0xF7
STS-1 with 23 VTx PDs
0xF8
STS-1 with 24 VTx PDs
0xF9
STS-1 with 25 VTx PDs
0xFA
STS-1 with 26 VTx PDs
0xFB
STS-1 with 27 VTx PDs
0xFC
VT-structured STS-1 SPE with 28 VT1.5
(Payload defects or a non-VT-structured STS-1 or STS-Nc SPE with a payload
defect.)
0xFF
Reserved
Table 11-11
STS Path Signal Label Assignments for Signals with Payload Defects (continued)
Hex Code
Content of the STS SPE
Содержание 15454-DS1-14= - 1.544Mbps Expansion Module
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Страница 49: ...xlix Cisco ONS 15454 Reference Manual R8 5 78 18106 01 About this Manual ...
Страница 51: ...li Cisco ONS 15454 Reference Manual R8 5 78 18106 01 About this Manual ...
Страница 168: ...2 34 Cisco ONS 15454 Reference Manual R8 5 78 18106 01 Chapter 2 Common Control Cards 2 7 6 Data Communications Channel ...
Страница 296: ...5 40 Cisco ONS 15454 Reference Manual R8 5 78 18106 01 Chapter 5 Ethernet Cards 5 14 4 SFP Description ...
Страница 320: ...7 16 Cisco ONS 15454 Reference Manual R8 5 78 18106 01 Chapter 7 Card Protection 7 5 External Switching Commands ...
Страница 358: ...10 6 Cisco ONS 15454 Reference Manual R8 5 78 18106 01 Chapter 10 Timing 10 3 2 SDH SSM Messages ...
Страница 584: ...15 56 Cisco ONS 15454 Reference Manual R8 5 78 18106 01 Chapter 15 Performance Monitoring 15 9 3 FC_MR 4 History Window ...
Страница 608: ...16 24 Cisco ONS 15454 Reference Manual R8 5 78 18106 01 Chapter 16 SNMP 16 10 7 Event RMON Group ...
Страница 796: ...C 122 Cisco ONS 15454 Reference Manual R8 5 78 18106 01 Appendix C Network Element Defaults C 4 CTC Default Settings ...
Страница 826: ...Index IN 30 Cisco ONS 15454 Reference Manual R8 5 78 18106 01 ...