Ip Interface Attached Vpls Service Constraints; Ip Interface And Vpls Operational State Coordination; Ip Interface Mtu And Fragmentation - Alcatel-Lucent 7210 SAS M Service Manual

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IP Interface Attached VPLS Service Constraints

Once a VPLS service has been bound to an IP interface through its service name, the service name

assigned to the service cannot be removed or changed unless the IP interface is first unbound from

the VPLS service name.

A VPLS service that is currently attached to an IP interface cannot be deleted from the system

unless the IP interface is unbound from the VPLS service name.

The allow-ip-int-binding flag within an IP interface attached VPLS service cannot be reset. The IP

interface must first be unbound from the VPLS service name to reset the flag.

When the IP interface is successfully attached to a VPLS service, the operational state of the IP

interface is dependent upon the operational state of the VPLS service.

The VPLS service itself remains down until at least one virtual port (SAP, spoke-SDP or Mesh-

SDP) is operational.

In 7210 SAS-M Access-Uplink mode, VPLS service MTU is not supported. The user must ensure

that the port MTU is configured appropriately so that the largest packet traversing through any of

the SAPs (virtual ports) of the VPLS service can be forwarded out of any of the SAPs. VPLS

services do not support fragmentation and can discard packets larger than the configured port

When an IP interface is associated with a VPLS service, the IP-MTU is based on either the

administrative value configured for the IP interface or an operational value derived from port

MTU. of all the SAPs configured in the service. The port MTU excluding the Layer 2 Header and

tags for all the ports which have SAPs configured in this VPLS service are considered and the

minimum value among those are computed (which is called computed MTU). The operational

value of the IP interface is set as follows:

If the configured (administrative) value of IP MTU is greater than the computed MTU,

then the operational IP MTU is set to the computed MTU.

If the configured (administrative) value of IP MTU is lesser than or equal to the computed

MTU, then operational IP MTU is set to the configured (administrative) value of IP MTU.

7210 SAS M Services Guide

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