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Cisco ONS 15454 SDH Product Overview

Ethernet

Cisco ONS 15454 SDH Product Overview, R3.4

September 2002

Spanning Tree Protocol

The ONS 15454 SDH uses the IEEE 802.1D standard to provide Spanning Tree

Protocol (STP) on the E-series cards. STP detects and eliminates network loops

both internally and externally. Internally, it detects multiple circuit paths between

any two network ports and blocks ports until only one path exists. The single path

eliminates possible bridge loops.

Externally, you can enable STP at the Ethernet port level to allow parallel

connections to external networking equipment. STP allows only one connection

to be used at any given time.

Single-Card and Multicard EtherSwitch

The ONS 15454 SDH supports Single-card and Multicard EtherSwitch on the

E-series Ethernet cards.

When you provision a Single-card EtherSwitch (Figure 17), each Ethernet card is a

single switching entity within the ONS 15454 SDH. This option allows a full

VC4-4c worth of bandwidth between two Ethernet circuit points. Single-card

EtherSwitch supports one VC4-4c, two VC4-2c, one VC4-2c plus two VC4s, or four

VC4s.

Note When configuring one VC4-2c plus two VC4s, the VC4-2c must be

provisioned before either of the VC4 circuits.

Figure 17 Single-card EtherSwitch

ONS NodeONS Node

Router

Ethernet card #3

Router

Ethernet card #1

Ethernet card #4

Ethernet card #2

VLAN B

VLAN A

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Cisco ONS 15454 SDH Especificaciones Pagina 34