Nortel Networks NTRN10AN, 3500 manual 180Operation, administration, and maintenance OAM features

2-180Operation, administration, and maintenance (OAM) features

Figure 2-67

Improper use of STS path bridge and select on a shared VT-managed STS results in VT traffic loss in case of a fiber cut

EX1553p

VT#1, STS-1 #1

OM3500

X	OC-3/12/48
	UPSR ring

OM3500

VT#2, STS-1 #1

OM3500

(W/STX)

STS-1 #1

VTs

OK

X Fail

OK	STS-1 Path
X Fail	bridge & select
VTs
	STS-1 #1

Backbone

Network

Note 1: When an STS path bridge & select is applied to a shared VT-managed

STS between multiple sites, OPTera Metro 3500 (W/STX) might have to choose between two STS paths each containing different failed VTs, resulting in some VT traffic loss. Note 2: For simplicity only one direction is shown.

OPTera Metro 3500 Multiservice Platform NTRN10AN Rel 12.1 Standard Iss 1 Apr 2004