Alcatel-Lucent 7210 SAS M Service Manual page 219

When this command is enabled, the pseudowire standby bit (value 0x00000020) will be sent to T-
Description
LDP peer for each spoke-sdp of the endpoint that is selected as a standby.
This command is mutually exclusive with a VLL mate SAP created on a mc-lag/mc-aps or ICB. It is
also mutually exclusive with vc-switching.
no standby-signaling-master
Default
service-mtu
Note :This command is supported on 7210 SAS-M in Network mode.
service-mtu octets
Syntax
no service-mtu
Context config>service>epipe
This command configures the service payload (Maximum Transmission Unit – MTU), in bytes, for a
Description
service. The specified MTU value overrides the service-type default MTU. The service-mtu defines
the payload capabilities of the service. It is used by the system to validate the operational states of
SAP and SDP bindings in a service.
The service MTU and a SAP service delineation encapsulation overhead (that is, 4 bytes for a dot1q
tag) is used to derive the required MTU of the physical port or channel, on which the SAP is created.
If the required payload is larger than the port or channel MTU, the SAP transitions to an inoperative
state.
If the required MTU is equal to or less than the port or channel MTU, the SAP transitions to an
operative state.
The service MTU is compared to the path MTU associated with an SDP before binding an SDP to a
service. The path MTU can be administratively defined in the context of the SDP. The default or
administrative path MTU can be dynamically reduced based on:
If the service MTU is greater than the path MTU, the SDP binding for the service transitions to an
inoperative state. If the service MTU is equal to or less than the path MTU, the SDP binding
transitions to an operative state.
If a service MTU, path MTU or a channel MTU is dynamically or administratively modified, the
operational states of all associated SAP and SDP bindings are automatically re-evaluated.
The no form of the command restores the default service-mtu of the indicated service type to default
value.
Note: To disable service MTU check, execute the command no service-mtu-check. Disabling service
MTU check allows the packets to pass to the egress if the packet length is lesser than or equal to the
MTU configured on the port.
epipe: 1514
Default
The following table displays MTU values for specific VC types.
7210 SAS M Services Guide
• The MTU capabilities discovered by the tunneling mechanism of the SDP.
• The egress interface MTU capabilities based on the next hop in the tunnel path.
Virtual Leased Line Services
Page 219