Link Capacity Adjustment Scheme (LCAS)
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LCAS
The X8PL, EPL4_E14, and EPL4_E132_75 option cards for Ethernet private line
applications and the ESW4_E14 Ethernet option card support the Link Capacity
Adjustment Scheme (LCAS).
LCAS defines a synchronization protocol between two termination points of a virtual
concatenated path that allows in-service dynamic sizing of the VCn-Xv bandwidth that
is available for Ethernet-over-SDH transmission. This bandwidth change can occur
either in response to a failure condition on one member or a requirement for a change
in bandwidth at an NE (provisioning action).
In case of failure, the bandwidth will be restored automatically after the failure clears.
The size of the VCn-Xv is increased or decreased in steps of one VCn. The
provisioning is performed by adding/removing paths to/from the Ethernet tributary
card.
The default LCAS hold-off timer is set to zero so that the LCAS mechanism will take
immediate action. However, if the path over which the LCAS protocol is run is
protected by a transmission protection mechanism such as MSP or SNCP the LCAS
hold-off timer value should be raised (~100 ms) to allow the generally faster MSP or
SNCP protection mechanisms to react before the LCAS undertakes any repair attempts.
In this way less packets are lost.
Features
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3-22
Lucent Technologies - Proprietary
See notice on first page
365-312-847R4.0
Issue 4, November 2006