Atag sequence numbers, Topology enhancements, Vt management on a upsr – Nortel Networks OPTera Metro 3500 User Manual
Page 213: Atag sequence numbers 2-175, Vt management on a upsr 2-175
Operation, administration, and maintenance (OAM) features 2-175
Planning and Ordering Guide—Part 1 of 2 NTRN10AN Rel 12.1 Standard Iss 1 Apr 2004
ATAG sequence numbers
ATAG is a numeric transaction identifier similar to CTAG. The ATAG value is
automatically generated by a TL1 agent and is used exclusively as a sequence
number for autonomous messages. It is a number from 1 to 999999. The first
ATAG used is 1 when the agent first initializes or is reset. The ATAG
automatically wraps to 1 for the next autonomous message when the previous
message is assigned 999999.
Each instance of a Database change (DBCHG), Log (LOG), or Inventory
(INVENTORY) event is assigned a unique ATAG value. ATAGs survive
warm / cold restarts, circuit pack pulls, and circuit pack swaps. ATAGs do not
survive save and restore activities. ATAGs are global to the entire network
element (that is, the sequence is continuous and uninterrupted spanning all
users and sessions on a network element).
Topology enhancements
OPTera Metro 3500 Release 11.0 introduced the following enhancements to
the topology mapping feature:
•
a network processor will recognize an adjacent OPTera Metro 3000
network element outside the network processor span of control
•
a network processor will recognize an adjacent OPTera Connect DX
network element
•
the MAC address of an OPTera Connect DX is displayed
In order for a network processor to retrieve a connection to an adjacent
network element, there must be an SDCC connection between the network
processor’s local shelf and the adjacent neighbor.
VT management option on STX equipped OPTera Metro 3500
OPTera Metro 3500 equipped with STX-192 circuit packs is a cross-connect
which operates at STS-1 and higher granularity. When you use STS-managed
OPTera Metro 3500 NEs with equipment that supports virtual tributaries (VT),
such as OPTera Metro 3000 equipped with VTX-series circuit packs, consider
VT management when planning traffic flow and the path originating and
terminating points.
This section discusses VT management on subtending UPSR and VT
grooming.
VT management on a UPSR
Since the STS-managed OPTera Metro 3500(with STX) does not switch at the
VT level, when you provision a connection between two VT-managed OPTera
Metro 3000 NEs that pass through STS-managed OPTera Metro 3500, use the
same VT and VT group number at the OPTera Metro 3000 endpoints.