Juniper JUNOSE 11.2.X MULTICAST ROUTING, Руководство по настройке

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T3 layer
You can also configure the router to start loopback testing when it receives an appropriate
signal from a devices connected at any of these layers.
For a list of the modules that support remote loopback, see ERX Module Guide, Appendix
A, Module Protocol Support .
NOTE: There is no protocol that allows remote loopback on E1 links.
To enable remote loopback:
1.
Select a controller.
2.
Configure remote loopback at the desired layers in the interface.
path ds1|e1 loopback remote
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Use to place a remote device, connected at the T1 over SONET/SDH VT layer, in
loopback.
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Specify one of the following options:
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line fdl ansi (T1 only)—Sends a repeating 16-bit ESF data link code word (00001110
11111111) to the remote end requesting that it enter into a network line loopback. Specify
the ansi keyword to enable the remote line facilities data link (FDL) ANSI bit loopback
on the T1 line, according to the ANSI T1.403 specification.
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line fdl bellcore (T1 only)—Sends a repeating 16-bit ESF data link code word
(00010010 11111111) to the remote end requesting that it enter into a network line
loopback. Specify the bellcore keyword to enable the remote line FDL Bellcore bit
loopback on the T1 line, according to the Bellcore TR-TSY-000312 specification.
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payload [ fdl ] [ ansi ] (T1 only)—Sends a repeating 16-bit ESF data link code word
(00010100 11111111) to the remote end requesting that it enter into a network payload
loopback. Enables the remote payload FDL ANSI bit loopback on the T1 line. You
can optionally specify
fdl and ansi .
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Example
host1(config-controll)# path 12 ds1 1/3/4 loopback remote line fdl ansi
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Use the no version to send the 16-bit ESF data link code word to deactivate the loopback
at the remote end, depending on the last activate request sent to the remote end.
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See path ds1|e1 loopback.
path ds1 remote-loopback
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Use to enable the router to accept remote loopback requests from a remote device
connected at the T1 over SONET/SDH VT layer.
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Example
host1(config-controll)# path 12 ds1 1/3/4 remote-loopback
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JunosE 11.2.x Physical Layer Configuration Guide