R3303-HP HSR6800 Routers Interface Command Reference

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The fr [ ietf | mfr interface-number | nonstandard ] option is supported by
HSR6802/HSR6804/HSR6808, but is not supported by FIP-600.
Examples
# Specify HDLC as the link protocol of interface POS 2/1/0.
<Sysname> system-view
[Sysname] interface pos 2/1/0
[Sysname-Pos2/1/0] link-protocol hdlc
loopback
Use loopback to enable loopback for a POS interface.
Use undo loopback to disable loopback.
Syntax
loopback { local | remote }
undo loopback
Default
Loopback is disabled.
Views
POS interface view
Default command level
2: System level
Parameters
local: Enables internal loopback.
remote: Enables external loopback.
Usage guidelines
Loopback is intended for test use. Disable it otherwise.
If you enable loopback on a POS interface encapsulated with PPP, it is normal that the state of the link
layer protocol is reported up.
Loopback and clock slave cannot be set at the same time; otherwise, POS interfaces cannot be
connected successfully.
Examples
# Enable internal loopback on interface POS 2/1/0.
<Sysname> system-view
[Sysname] interface pos 2/1/0
[Sysname-Pos2/1/0] loopback local
mtu
Use mtu to set the MTU size of the POS interface.
Use undo mtu to restore the default.