Cisco Cisco ONS 15454 SONET Multiservice Provisioning Platform (MSPP) Guía De Diseño
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Figure 5-1: Block Diagram of E-Series Ethernet Cards
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Port 12
Port 11
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STS 12
STS 11
STS 10
STS 9
STS 8
STS 7
STS 6
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E100T-12
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E100T-12-G
GBIC
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Port 2
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STS 12
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STS 1
E1000-2
or
E1000-2-G
The E100T-G is the functional equivalent of the E100T-12. An ONS 15454 using XC-10G cross-
connect cards requires the G versions of the E-Series Ethernet cards. The E1000-2 is the
functional equivalent of the E1000-2-G. An ONS 15454 using XC-10G cross-connect cards
requires the G versions of the E-Series Ethernet cards.
E-Series cards support VLAN, IEEE 802.1Q, spanning tree, and IEEE 802.1D. These cards
conform to the general specifications of RFC 1619, but uses Cisco’s proprietary HDLC
encapsulation protocol. HDLC encapsulation adds 5 overhead bytes to the payload (1 byte =
flag, 1 byte = address, 1 byte = control, 1 byte = byte 1 of CRC-16, 1 byte = byte 2 of CRC-16).
Because of the proprietary nature of encapsulation, E-Series Ethernet circuits have to be
‘book-ended”. That is, E-Series Ethernet circuits must terminate only on E-Series cards. E-
Series circuits cannot terminate on G-Series cards or be handed off to an external device in its
native STS format (via an optical interface).
A single ONS 15454 can support a maximum of ten Ethernet cards, which can be installed in
slots 1 to 6 and 12 to 17. The ONS 15454 supports single-card EtherSwitch, multi-card
EtherSwitch group, and port-mapped modes for E-Series cards. Port-mapped mode is only
available on systems running Release 4.0 and higher.
E-Series Single-card EtherSwitch
Single-card EtherSwitch allows each Ethernet card to remain a single switching entity within the
ONS 15454 node. This option allows a full STS-12c worth of bandwidth between two Ethernet
circuit points. Figure 5-2 illustrates a single-card EtherSwitch configuration.