Port Features
Page 90
7750 SR OS Interface Configuration Guide
Remote Loopback
EFM OAM provides a link-layer frame loopback mode that can be remotely controlled.
To initiate remote loopback, the local EFM OAM client sends a loopback control OAM PDU by
enabling the OAM remote-loopback command. After receiving the loopback control OAM PDU,
the remote OAM client puts the remote port into local loopback mode.
To exit remote loopback, the local EFM OAM client sends a loopback control OAM PDU by
disabling the OAM remote-loopback command. After receiving the loopback control OAM PDU,
the remote OAM client puts the port back into normal forwarding mode.
Note that during remote loopback test operation, all frames except EFM OAM PDUs are dropped
at the local port for the receive direction, where remote loopback is enabled. If local loopback is
enabled, then all frames except EFM OAM PDUs are dropped at the local port for both the receive
and transmit directions. This behavior may result in many protocols (e.g., STP, LAG) resetting
their state machines.
Note that when a port is in loopback mode, service mirroring will not work if the port is a mirror-
source or a mirror-destination.
802.3ah OAM PDU Tunneling for Epipe Service
The 7750 routers support 802.3ah. Customers who subscribe to Epipe service treat the Epipe as a
wire, so they demand the ability to run 802.3ah between their devices which are located at each
end of the Epipe.
Note: This feature only applies to port-based Epipe SAPs because 802.3ah runs at port level not
VLAN level.
When OAM PDU tunneling is enabled, 802.3ah OAM PDUs received at one end of an Epipe are
forwarded through the Epipe. 802.3ah can run between devices that are located at each end of the
Epipe. When OAM PDU tunneling is disabled (by default), OAM PDUs are dropped or processed
locally according to the
efm-oam
configuration (shutdown or not shutdown).
Note that by enabling 802.3ah for a specific port and enabling OAM PDU tunneling for the same
port are mutually exclusive. Enforcement is performed on the CLI level.
Содержание 7750 SR OS
Страница 6: ...Page 6 7750 SR OS Interface Configuration Guide Table of Contents ...
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 ...