Specifications

29
Cisco ONS 15327 Product Overview, R3.3
June 2002
Cisco ONS 15327 Product Overview
Spanning Tree Protocol
Figure 23 Ethernet aggregation and transport
Transparent Local Area Network Service
The ONS 15327 supports transparent LAN Service (TLS) that provides private
network service across a SONET backbone. You can define specific Ethernet ports
and SONET STS channels as a virtual local area network (VLAN) group. VLAN
groups isolate subscriber traffic from users outside the VLAN group and keep
traffic from "leaking" into the virtual private network (VPN).
Spanning Tree Protocol
The ONS 15327 operates spanning tree protocol (STP) using the IEEE 802.1D
Q-tag standard. STP detects and eliminates network loops. When STP detects
multiple paths between any two network hosts, STP blocks ports until only one
Backbone
router
Router
ONS 15327
To subscribers
Router
To subscribers
10/100 Mbps
Connection to routers
47090
ONS 15327ONS 15327
SONET
Ethernet