Cisco Cisco ONS 15454 SONET Multiservice Provisioning Platform (MSPP) Guía De Diseño
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Figure 5-13: ONS 15454 Network with STP After Link Failure
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ONS 15454
#1
ONS 15454
#2
ONS 15454
#3
Workstation
Workstation
192.168.1.25
255.255.255.0
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VLAN Blue
192.168.1.50
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Slot 15/Port 1
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Slot 5/Ports 1&2
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Failure
E-Series Multi-Instance Spanning Tree and VLANs
The ONS 15454 can operate multiple instances of STP to support VLANs in a looped topology.
The ONS 15454 supports one STP instance per circuit and a maximum of eight STP instances
per ONS 15454. You can dedicate separate circuits across the SONET ring for different VLAN
groups (i.e., one for private TLS services and one for Internet access). Each circuit runs its own
STP to maintain VLAN connectivity in a multi-ring environment.
Spanning Tree on a Circuit-by-Circuit Basis
You can also disable or enable spanning tree on a circuit-by-circuit basis on unstitched Ethernet
cards in a point-to-point configuration. This feature allows customers to mix spanning tree
protected circuits with unprotected circuits on the same card. It also allows two single-card
EtherSwitch Ethernet cards on the same node to form an intranode circuit.
E-Series Spanning Tree Parameters
Default spanning tree parameters listed in Table 5-3 are appropriate for most situations, but can
be modified as required.