R0106-HP MSR Router Series Layer 2 - WAN Command Reference(V7)

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[Sysname] interface atm 2/4/0
[Sysname-ATM2/4/0] pvc-group 2
[Sysname-ATM2/4/0-pvc-group-2] pvc 1/33
[Sysname-ATM2/4/0-pvc-group-2-pvc-1/33] oam cc both
oam loopback
Use oam loopback to enable OAM F5 Loopback cell transmission and retransmission detection and
modify related parameters.
Use undo oam loopback to disable OAM F5 Loopback cell transmission and retransmission detection.
Syntax
oam loopback interval [ up up-count down down-count retry retry-interval ]
undo oam loopback
Default
OAM F5 Loopback cell transmission is disabled. Responses are sent if OAM F5 Loopback cells are
received.
Views
PVC view, PVC view in a PVC-group
Predefined user roles
network-admin
Parameters
interval: Specifies the interval for sending OAM F5 Loopback cells, in the range of 1 to 600 seconds.
up up-count: Specifies the number of successive OAM F5 Loopback cells received before the PVC comes
up. The value range for the up-count argument is 1 to 600, and the default is 3.
down down-count: Specifies the number of successive OAM F5 Loopback cells not received before the
PVC goes down. The value range for the down-count argument is 1 to 600, and the default is 5.
retry retry-interval: Specifies the interval for sending retransmission detection cells before PVC state
change. The value range for the retry-interval argument is 1 to 1000 seconds, and the default is 1
second.
Usage guidelines
After you enable OAM F5 Loopback cell transmission and retransmission detection on a PVC, the PVC
sends OAM F5 Loopback cells at the interval specified by the interval argument. If the PVC receives no
responses after a time period specified by the retry-interval argument, it immediately sends OAM F5
Loopback cells again.
The PVC state is updated during the OAM F5 Loopback cell transmission and retransmission detection
process:
• If the PVC is down, it comes up when the number of successive OAM F5 Loopback cells received
reaches the value specified by the up-seconds argument.
• If the PVC is up, it goes down when the number of successive OAM F5 Loopback cells not received
reaches the value specified by the down-count argument.