Ports
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7710 SR OS Interface Configuration Guide
Protection of Upper Layer Protocols and Services
APS prevents upper layer protocols and services from being affected by the failure of the active
circuit.
The following example with figures and description illustrate how services are protected during a
single-chassis APS swithover.
Figure 11: APS Working and Protection Circuit Example
is an example in which the APS working circuit is connected to IOM-1 / MDA-1 and the
protection circuit is connected to IOM-2 / MDA-1. In this example, assume that the working
circuit is currently used to transmit and receive data.
Switchover Process for Transmitted Data
For packets arriving on all interfaces that need to be transmitted over APS protected interfaces, the
next hop associated with all these interfaces are programmed in all Flexible Fast-Path complexes
in each MDA with a logical next-hop index. This next hop-index identifies the actual next-hop
information used to direct traffic to the APS working circuit on IOM-1 / MDA-1.
All Flexible Fast-Path complexes in each MDA are also programmed with next hop information
used to direct traffic to the APS protect circuit on IOM-2 / MDA-1. When the transmitted data
needs to be switched from the working to the protect circuit, only the relevant next hop indexes
IOM-CPU
MDA-1
Flexible FastPath
Complex
MDA-2
Flexible FastPath
Complex
IOM-CPU
APS-CTL
Services
IOM-CPU
APS Working
MDA-1
Flexible FastPath
Complex
MDA-2
Flexible FastPath
Complex
MDA-1
Flexible FastPath
Complex
MDA-2
Flexible FastPath
Complex
APS Protect
IOM-1
IOM-2
IOM-3
Fig_4
Содержание 7710 SR SONET
Страница 6: ...Page 6 7710 SR OS Interface Configuration Guide Table of Contents...
Страница 8: ...Page 8 7710 SR OS Interface Configuration Guide List of Tables...
Страница 10: ...Page 10 7710 SR OS Interface Configuration Guide List of Figures...
Страница 14: ...Preface Page 14 7710 SR OS Interface Configuration Guide...
Страница 16: ...Getting Started Page 16 7710 SR OS Interface Configuration Guide...
Страница 18: ...Page 18 7710 SR OS Interface Configuration Guide Configuration Notes on page 107...
Страница 166: ...Service Management Tasks Page 152 7710 SR OS Interface Configuration Guide...
Страница 354: ...Multi Chassis Redundancy Commands Page 328 7710 SR OS Interface Configuration Guide...
Страница 494: ...Standards and Protocols Page 494 Standards and Protocols...
Страница 496: ...Index Page 496 7710 SR OS Interface Configuration Guide...