Virtual Private LAN Services
Page 372 7210 SAS-X, R6 OS Services Guide
config>template>vpls-template
Description Specifies the aging time for remotely learned MAC addresses in the forwarding database (FDB) for
the Virtual Private LAN Service (VPLS) instance. In a VPLS service, MAC addresses are associated
with a Service Access Point (SAP) or with a Service Distribution Point (SDP). MACs associated with
a SAP are classified as local MACs, and MACs associated with an SDP are remote MACs.
Like in a layer 2 switch, learned MACs can be aged out if no packets are sourced from the MAC
address for a period of time (the aging time). In each VPLS service instance, there are independent
aging timers for local learned MAC and remote learned MAC entries in the FDB. The remote-age
timer specifies the aging time for remote learned MAC addresses. To reduce the amount of signaling
required between switches configure this timer larger than the local-age timer.
The no form of this command returns the remote aging timer to the default value.
Default remote age 900 — Remote MACs aged after 900 seconds
Parameters seconds — The aging time for remote MACs expressed in seconds.
Values 60 — 86400
send-flush-on-failure
Syntax [no] send-flush-on-failure
Context config>service>vpls
Description This command enables sending out “flush-all-from-ME” messages to all LDP peers included in
affected VPLS, in the event of physical port failures or “oper-down” events of individual SAPs. This
feature provides an LDP-based mechanism for recovering a physical link failure in a dual-homed
connection to a VPLS service. This method provides an alternative to RSTP solutions where dual
homing redundancy and recovery, in the case of link failure, is resolved by RSTP running between a
PE router and CE devices. If the endpoint is configured within the VPLS and send-flush-on-failure is
enabled, flush-all-from-me messages will be sent out only when all spoke SDPs associated with the
endpoint go down.
This feature cannot be enabled on management VPLS.
Default no send-flush-on-failure
service-mtu
Syntax service-mtu octets
no service-mtu
Context config>service>vpls
Description This command configures the service payload (Maximum Transmission Unit – MTU), in bytes, for
the service. This 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 SAP and SDP binding’s
operational state within the service.
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