Virtual Private LAN Services
7750 SR OS Services Guide Page 471
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.
Default VPLS: 1514
The following table displays MTU values for specific VC types.
octets — The size of the MTU in octets, expressed as a decimal integer.
Values 1 — 9194
split-horizon-group
Syntax [no] split-horizon-group [group-name] [residential-group]
Context config>service>vpls
Description 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.
VC-Type Example
Service MTU
Advertised
MTU
Ethernet 1514 1500
Ethernet (with preserved dot1q) 1518 1504
VPLS 1514 1500
VPLS (with preserved dot1q) 1518 1504
VLAN (dot1p transparent to MTU value) 1514 1500
VLAN (QinQ with preserved bottom Qtag) 1518 1504
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