Stinger OC3-ATM Trunk Module Guide
2-1
2
Configuring Trunk Port Redundancy
Administrators can choose to run the full trunk-side bandwidth or to set up a redundant
configuration.
The Stinger unit can obtain its system clock by sourcing the ATM network clock on one of the
trunk ports. One or more of the ports can be designated as eligible clock sources, and assigned
a priority for use as the clock source.
Introducing trunk port redundancy
Trunk port redundancy provides a 1:1 sparing function for trunk port failure. The trunk port to
be backed up (the primary trunk port) does not have to be of the same type as the spare trunk
port. Both automatic and manual trunk port redundancy are supported.
When the redundancy function is invoked, the primary trunk port is deactivated. Its logical
connections are terminated and then reestablished on the spare trunk port. With manual trunk
port redundancy, an administrator invokes the sparing function manually by setting the
Sparing-Mode parameter to
manual
, and manually disables it by setting the Sparing-Mode
parameter to
inactive
. When the sparing function is disabled, the spare trunk port is
deactivated. Its logical connections are terminated and reestablished on the primary trunk port.
Automatic trunk port redundancy is invoked when the system detects that a primary port has
become inactive. At that point, the spare port becomes active, and the primary port’s logical
connections are brought up on the spare. The connections are maintained on the spare until the
spare becomes inactive, at which point the system reestablishes the logical connections on the
primary port.
Trunk port redundancy settings
Following are the trunk port redundancy parameters, shown with default settings:
[in DS3-ATM/{ any-shelf any-slot 0 }]
name = ""
spare-physical-address = { any-shelf any-slot 0 }
sparing-mode = inactive
