Optimization For Improved Convergence Time; Controlling Mrp Scope Using Mrp Policies - Alcatel-Lucent 7750 SR Manual

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Optimization for Improved Convergence Time

Assuming that MMRP is used in a certain B-VPLS, under failure conditions the time it takes for

the B-VPLS forwarding to resume may depend on the data plane and control plane convergence

plus the time it takes for MMRP exchanges to settle down the flooding trees on a per ISID basis.

In order to minimize the convergence time, Alcatel-Lucent's PBB implementation offers the

selection of a mode where B-VPLS forwarding reverts for a short time to flooding so that MMRP

has enough time to converge. This mode can be selected through configuration using the

configure>service>vpl> bvpls>mrp>flood-time value command where value represents the

amount of time in seconds that flooding will be enabled. Refer to the

If this behavior is selected, the forwarding plane reverts to B-VPLS flooding for a configurable

time period, for example, for a few seconds, then it reverts back to the MFIB entries installed by

The following B-VPLS events initiate the switch from per I-VPLS (MMRP) MFIB entries to "B-

VPLS flooding":

MMRP advertises the Group BMACs associated with ISIDs throughout the whole BVPLS context

regardless of whether a specific IVPLS is present in one or all the related PEs or BEBs. When

evaluating the overall scalability the resource consumption in both the control and data plane must

be considered:

In a multi-domain environment, for example multiple MANs interconnected through a WAN, the

BVPLS and implicitly MMRP advertisement may span across domains. The MMRP attributes

will be flooded throughout the BVPLS context indiscriminately, regardless of the distribution of

IVPLS sites.

7750 SR OS Services Guide

for command syntax and usage.

Reception or local triggering of a TCN

B-SAP failure

Failure of a B-SDP binding

Pseudowire activation in a primary/standby HVPLS resiliency solution

SF/CPM switchover due to STP reconvergence

Control plane - MMRP processing and number of attributes advertised

Data plane – one tree is instantiated per ISID or Group BMAC attribute

Virtual Private LAN Services

PBB Command Reference