Alcatel-Lucent 7750 SR OS Service Manual page 471

Service router - mobile gateway

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When binding an SDP to a service, the service MTU is compared to the path MTU associated with the

SDP. The path MTU can be administratively defined in the context of the SDP. The default or

administrative path MTU can be dynamically reduced due to the MTU capabilities discovered by the

tunneling mechanism of the SDP or the egress interface MTU capabilities based on the next hop in

the tunnel path. If the service MTU is larger than the path MTU, the SDP binding for the service will

be placed in an inoperative state. If the service MTU is equal to or less than the path MTU, then the

SDP binding will be placed in an operational state.

In the event that a service MTU, port or channel MTU, or path MTU is dynamically or

administratively modified, then all associated SAP and SDP binding operational states are

automatically re-evaluated.

The no form of this command returns the default service-mtu for the indicated service type to the

default value.

The following table displays MTU values for specific VC types.

octets — The size of the MTU in octets, expressed as a decimal integer.

split-horizon-group

[no] split-horizon-group [group-name] [residential-group]

config>service>vpls

This command creates a new split horizon group for the VPLS instance. Traffic arriving on a SAP or

spoke SDP within this split horizon group will not be copied to other SAPs or spoke SDPs in the same

split horizon group.

A split horizon group must be created before SAPs and spoke SDPs can be assigned to the group.

The split horizon group is defined within the context of a single VPLS. The same group-name can be

re-used in different VPLS instances.

Up to 30 split horizon groups can be defined per VPLS instance.

The no form of the command removes the group name from the configuration.

7750 SR OS Services Guide

Ethernet (with preserved dot1q)

VPLS (with preserved dot1q)

VLAN (dot1p transparent to MTU value)

VLAN (QinQ with preserved bottom Qtag)

Virtual Private LAN Services