Juniper JUNOSE 11.1.X - LINK LAYER CONFIGURATION 4-7-2010, Руководство по настройке

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Running ATM Ping
Keep in mind the following when you use ATM ping:
■
Before you can run ATM ping, you need to add a PVC for the VPI and VCI over
which you run the ping.
■
Because ATM ping requires the receipt of OAM cells, make sure that the receipt
and transmission of OAM cells is not disabled (using “atm oam flush” on page 37
). To reenable the receipt and transmission of OAM cells, enter
no atm oam
flush .
■
Disabling receipt of OAM cells during a ping operation stops all outstanding ping
operations. You need to manually restart the ping operation after receipt of OAM
cells for the interface is enabled.
■
Because ATM ping is a dynamic (on-demand) operation, none of the configuration
related to ATM ping is saved. To avoid acquiring excessive bandwidth for OAM,
the number of outstanding ping operations on each interface is limited to 12.
ping atm interface atm
■
Use to send loopback cells from an ATM interface or circuit.
■
The VPI and VCI fields determine the type of loopback cells used for the ping
operation. By default F5 end-to-end loopback OAM cells are used.
■
To send F4 segment loopback cells, set the VCI to 3.
■
To send F4 end-to-end loopback cells, set the VCI to 4.
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Use the end-loopback keyword to send the ping to the connection endpoint.
■
Use the seg-loopback keyword to send the ping to the first segment point (for
example, the next neighbor switch).
■
Use the destination option to specify the value of the location ID included in the
loopback cell. The location ID is a 16-octet field, and the destination portion is
4 octets. You can set the location ID to a specific destination or to 0s (zeros) or
1s (ones).
■
If you set the destination to 0, the loopback location ID in the loopback cell
is initialized to all 0s, and each segment point in the network responds to
the ping.
■
If you set the destination to 1s, the loopback location ID in the loopback cell
is initialized to all 1s, and only the connection endpoint responds to the ping.
■
If you use the default value of 0xFFFFFFFF, the loopback location ID in the
loopback cell is initialized to all 1s.
For information about how the router handles loopback cells based on location
ID, see Table 6 on page 20.
■
The count keyword sets the number of OAM loopback cells to send to the
destination. The default value is 5. The maximum is 32.
■
The timeout keyword sets the amount of time to wait for a response to the sent
OAM loopback cell. The default value is 5 seconds.
38 ■
Configuring OAM
JUNOSe 11.1.x Link Layer Configuration Guide