Port Features
Page 60
7750 SR OS Interface Configuration Guide
Multi-Chassis APS
The APS functionality can protect against nodal (7750 SR) failure by configuring the working
circuit of an APS group on one 7750 SR node while configuring the protect circuit of the same
APS group on a different 7750 SR node.
These two nodes connect to each other with an IP link that is used to establish a signalling path
between the two 7750 SRs. Note that the working circuit and the protect circuit must have
compatible configurations (such as the same speed, framing, and port-type). The relevant APS
groups in both the working and protection routers must have same group ID, but they can have
different names (for example, group port descriptions). The configuration consistency between the
working circuit/router and the protection circuit/router is not enforced by the 7750 SR. Service or
network-specific configuration data is not signalled and synchronized between the two service
routers.
Signalling is provided using the direct connection between the two service routers. A heartbeat
protocol can be used to add robustness to the interaction between the two routers. Signalling
functionality includes support for:
•
APS group matches between service routers.
•
Verification that one side is configured as a working circuit and the other side is
configured as the protect circuit. In case of a mismatch, a trap (incompatible-neighbor) is
generated.
•
Change in working circuit status is sent from the working router to keep the protect router
in sync.
•
Protect router, based on K1/K2 byte data, member circuit status, and external request,
selects the active circuit, and informs the working router to activate or de-activate the
working circuit.
Note that external requests like lockout, force, and manual switches are allowed only on the APS
group having the protection circuit.
Multi-chassis APS is supported for channels with PPP and ATM encapsulation. Multi-chassis APS
is supported for multilink-bundles of type PPP but not for multlink-bundles of type IMA. Multi-
chassis APS is not supported for channels with cHDLC and frame-relay encapsulation. on ATM
MDA and ASAP MDA. It is also supported for ATM and PPP channelized interfaces, and for
MLPPP bundles on ASAP MDA.
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Страница 8: ...Page 8 7750 SR OS Interface Configuration Guide List of Tables ...
Страница 10: ...Page 10 7750 SR OS Interface Configuration Guide List of Figures ...
Страница 14: ...Preface Page 14 7750 SR OS Interface Configuration Guide ...
Страница 16: ...Getting Started Page 16 7750 SR OS Interface Configuration Guide ...
Страница 184: ...Card MDA and Port Command Reference Page 184 7750 SR OS Interface Configuration Guide ...
Страница 417: ...Interface Configuration 7750 SR OS Interface Configuration Guide Page 417 4 5 SAP PVT 1 1 up up A ima2 ...
Страница 429: ...Interface Configuration 7750 SR OS Interface Configuration Guide Page 429 Cells 0 0 Unknown VPI VCI Cells 0 A ALA 49 ...
Страница 437: ...Interface Configuration 7750 SR OS Interface Configuration Guide Page 437 bundle num 1 256 type ppp ...
Страница 438: ...Debug Commands Page 438 7750 SR OS Interface Configuration Guide ...
Страница 444: ...Index Page 444 7750 SR OS Interface Configuration ...