Alcatel-Lucent 7750 SR Manual page 635

Os services guide

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local age 300 — Local MACs aged after 300 seconds.

aging-timer — The aging time for local MACs expressed in seconds.

[no] mac-move

config>service>vpls

This command enables the context to configure MAC move attributes. A sustained high re-learn rate

can be a sign of a loop somewhere in the VPLS topology. Typically, STP detects loops in the

topology, but for those networks that do not run STP, the mac-move feature is an alternative way to

protect your network against loops.

When enabled in a VPLS, mac-move monitors the re-learn rate of each MAC. If the rate exceeds the

configured maximum allowed limit, it disables the SAP where the source MAC was last seen. The

SAP can be disabled permanently (until a shutdown/no shutdown command is executed) or for a

length of time that grows linearly with the number of times the given SAP was disabled. You have the

option of marking a SAP as non-blockable in the config>service>vpls>sap>limit-mac-move or

config>service>vpls>spoke-sdp>limit-mac-move contexts. This means that when the re-learn rate

has exceeded the limit, another (blockable) SAP will be disabled instead.

The mac-move command enables the feature at the service level for SAPs and spoke SDPs, as only

those objects can be blocked by this feature. Mesh SDPs are never blocked, but their re-learn rates

(sap-to-mesh/spoke-to-mesh or vice versa) are still measured.

The operation of this feature is the same on the SAP and spoke SDP. For example, if a MAC address

moves from SAP to SAP, from SAP to spoke SDP, or between spoke SDPs, one will be blocked to

prevent thrashing. If the MAC address moves between a SAP and mesh SDP or spoke SDP and mesh

SDP combinations, the respective SAP or spoke SDP will be blocked.

mac-move will disable a VPLS port when the number of relearns detected has reached the number of

relearns needed to reach the move-frequency in the 5-second interval. For example, when the move-

frequency is configured to 1 (relearn per second) mac-move will disable one of the VPLS ports when

5 relearns were detected during the 5-second interval because then the average move-frequency of 1

relearn per second has been reached. This can already occur in the first second if the real relearn rate

is 5 relearns per second or higher.

The no form of this command disables MAC move.

config>service>vpls

This command indicates whether or not this MAC is protected. When enabled, the agent will protect

the MAC from being learned or re-learned on a SAP that has restricted learning enabled.

7750 SR OS Services Guide

Virtual Private LAN Services