Alcatel-Lucent 7750 SR OS Interface Configuration Manual page 366

Configuration Commands
requests this option, it will be rejected. When transmitting echo-requests a magic number of 0 is used.
When responding to echo-requests a magic number of 0 is sent.
The magic number option is sent to the remote peer during protocol negotiation. If this option is
rejected by the remote peer, the router will bring the link up but will be unable to detect loopbacks
since the router will always send a magic number of 0 in the echo messages. If this option is accepted
by the remote peer, the router will send echo messages with randomly generated magic-numbers. If
the SR receives a config-req with the same magic number that was sent out, the router will calculate a
new magic number to use and send out another config-request. If the router is persistently seeing the
randomly generated magic number in the received config-req, the router will declare a loopback.
The no form of the command disables the loopback detection.
Default
no magic-number
multiclass
Syntax multiclass count
no multiclass
Context config>port>ml-bundle>multiclass
Description This command enables multi-class MLPPP as defined by RFC 2686, The Multi-Class Extension to
Multi-Link PPP, on a MLPPP bundle (including MLPPP bundle protection groups) with 2, 3 or 4
classes. For multiclass MLPPP bundles with a non-zero count, the class index takes valid values from
0 to one less than the maximum number of classes inclusive. For example a 4-class MLPPP bundle
has 4 classes with indices 0, 1, 2, and 3. A bundle must be shutdown with no links for this value to be
changed.
Entries are created and deleted by the system depending on the number of classes being used by a
given MLPPP bundle.
The no form of the command disables multi-class MLPPP.
Default
4
Parameters
count — Specifies the number of classes in a MLPPP bundle.
mrru
Syntax mrru mrru
no mrru
Context config>port>multilink-bundle
Description This command specifies the maximum received reconstructed unit (MRRU), similar to a maximum
transmission unit (MTU), but applies only to MLPPP multilink bundles. The MRRU is the maximum
frame size that can be reconstructed from multilink fragments. This command is only valid for
MLPPP bundles.
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Values
2 — 4
7750 SR OS Interface Configuration Guide