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The number of cells can be from 1 through 32,000. For a configuration example,
see "Example: Configuring ATM2 IQ Interfaces" on page 360.
Defining the ATM OAM F5 Loopback Cell Period
For ATM1 and ATM2 IQ interfaces with an ATM encapsulation, you can configure
the OAM F5 loopback cell period on virtual circuits. This is the interval at which OAM
F5 loopback cells are transmitted.
By default, no OAM F5 loopback cells are sent. To send OAM F5 loopback cells,
include the
For a list of hierarchy levels at which you can include this statement, see oam-period.
The period can be from 1 through 900 seconds. You can also choose the
option to disable the OAM loopback cell transmit feature.
OAM VC-AIS and VC-RDI defect indication cells are used for identifying and reporting
VC defects end-to-end. When a physical link or interface failure occurs, intermediate
nodes insert OAM AIS cells into all the downstream VCs affected by the failure. Upon
receiving an AIS cell on a VC, the router marks the logical interface down and sends
an RDI cell on the same VC to notify the remote end of the error status. When an
RDI cell is received on a VC, the router sets the logical interface status to down. When
no AIS or RDI cells are received for 3 seconds, the router sets the logical interface
status to up. You do not need to configure anything to enable defect indication.
Configuring the ATM OAM F5 Loopback Cell Threshold
For ATM1 and ATM2 IQ interfaces with an ATM encapsulation, you can configure
the OAM F5 loopback cell threshold on VCs. This is the minimum number of
consecutive OAM F5 loopback cells received before a VC is declared up, or the
minimum number of consecutive OAM F5 loopback cells lost before a VC is declared
down.
By default, when five consecutive OAM F5 loopback cells are received, the VC is
considered to be up, and when five consecutive cells are lost, the VC is considered
to be down. To modify these values, include the
For a list of hierarchy levels at which you can include this statement, see oam-liveness.
The cell count can be a value from 1 through 255.
statement:
oam-period
oam-period (disable | seconds);
oam-liveness {
up-count cells;
down-count cells;
}
Chapter 13: Configuring ATM Interfaces
oam-liveness
Defining the ATM OAM F5 Loopback Cell Period
disable
statement:
337
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