Tiered Networks 13-13
IGX Routing Hubs in a Tiered Network
Communication includes the real time notification of the addition or deletion of a connection
segment and the ability to pass the availability (active state) or unavailability (inactive state) of the
connections crossing this interface.
A proprietary extension to the Annex G protocol is implemented which supports the exchange of
node information between an interface shelf and the routing network. This information is used to
support the IP Relay feature and the Robust Update feature used by network management.
Network Management access to the interface shelves is through the IP Relay mechanism supported
by the SNMP and TFTP or by direct attachment to the interface shelf. The IP Relay mechanism
relays traffic from the routing network to the attached interface shelves. No IP Relay support is
provided from the interface shelves into the routing network.
IGX routing hubs are the source of the network clock for its associated feeder nodes. Feeders
synchronize their time and date to match their routing hub.
Robust Object and Alarm Updates are sent to a network manager which has subscribed to the Robust
Updates feature. Object Updates are generated whenever an interface shelf is added or removed from
the hub node and when the interface shelf name or IP Address is modified on the interface shelf.
Alarm Updates are generated whenever the alarm state of the interface shelf changes between
Unreachable, Major, Minor and OK alarm states.
An interface shelf is displayed as a unique icon in the SV+ Network Management topology displays.
The colors of the icon and connecting trunks indicate the alarm state of each. Channel statistics are
supported by CVM, HDM, and LDM endpoints. Trunk Statistics are supported for the feeder trunk
and are identical to the existing IGX trunk statistics.
Preferred Routing
Preferred routing within the routing network can be used on all connections. Priority bumping is
supported within the routing network, but not in the interface shelves. All other connection features
such as conditioning, rrtcon, upcon, dncon, etc. are also supported.
Local and Remote Loopbacks
Connection local and remote loopbacks are managed at the user interface of the voice or data
endpoint Routing Node or interface shelf. The existing IGX voice and data port loopback features
are supported on the IGX interface shelf.
Testcon and Testdly
Tstcon is supported at the voice and data endpoints in a non-integrated fashion and is limited to a
pass/fail loopback test. Fault isolation is not performed. Intermediate endpoints at the BTM cards do
not support the tstcon feature. Tstdelay is also supported for the in a non-integrated fashion similar
to that of the tstcon command.
IGX Interface Shelf Description
The IGX interface shelf supports the termination of voice and data connection segments to a BTM.
The IGX interface shelf connects to the routing network via a BTM and associated BMT-E1 back
card on both the interface shelf and the IGX routing hub.
IGX interface shelves support the following network management features:
• Interval Statistics enable/disable/collection
