Cisco Cisco ONS 15454 SONET Multiservice Provisioning Platform (MSPP) Guía De Diseño

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The ML-Series offers Fast EtherChannel, Gigabit EtherChannel, and Packet-over-SONET (POS) 
channel link aggregation.  Link aggregation groups multiple ports into a larger logical port and 
provides resiliency during the failure of any individual ports.  The ML-Series supports a maximum 
of 4 Ethernet ports in Fast EtherChannel, 2 Ethernet ports in Gigabit EtherChannel, and 2 
SONET/SDH virtual ports in the POS channel. The POS channel is only supported with LEX 
encapsulation. 
 
Traffic flows map to individual ports based on MAC source address (SA)/destination address (DA) 
for bridged packets and IP SA/DA for routed packets.  There is no support for policing or class-
based packet priorities when link aggregation is configured. 
 
Traditionally EtherChannel is a trunking technology that groups together multiple full-duplex 802.3 
Ethernet interfaces to provide fault-tolerant high-speed links between switches, routers, and 
servers.  EtherChannel is a logical aggregation of multiple Ethernet interfaces.  EtherChannel 
forms a single higher bandwidth routing or bridging endpoint. EtherChannel is designed primarily 
for host-to-switch connectivity.  The ML-Series card extends this link aggregation technology to 
bridged POS interfaces. 
 
Link aggregation provides the following benefits: 
 

    Logical aggregation of bandwidth 

   Load 

balancing 

   Fault 

tolerance 

 
The EtherChannel interface, consisting of multiple Fast Ethernet, Gigabit Ethernet or POS 
interfaces, is treated as a single interface, which is called a port channel.  You must perform all 
EtherChannel configurations on the EtherChannel interface (port channel) rather than on the 
individual member Ethernet interfaces.  You can create the EtherChannel interface by entering 
the interface port-channel interface configuration command.  Each ML100T-12 supports up to 7 
Fast EtherChannel (FEC) interfaces or port channels (6 Fast Ethernet and 1 POS).  Each 
ML1000-2 supports up to 2 Gigabit EtherChannel (GEC) interfaces or port channels (1 Gigabit 
Ethernet and 1 POS.) 
 
EtherChannel connections are fully compatible with IEEE 802.1Q trunking and routing 
technologies.  802.1Q trunking can carry multiple VLANs across an EtherChannel. 
 
Cisco’s FEC technology builds upon standards-based 802.3 full-duplex Fast Ethernet to provide a 
reliable high-speed solution for the campus network backbone.  FEC provides bandwidth 
scalability within the campus by providing up to 400-Mbps full-duplex Fast Ethernet on the 
ML100-12. 
 
Cisco’s GEC technology provides bandwidth scalability by providing 2-Gbps full-duplex aggregate 
capacity on the ML1000-2. 
 
Cisco’s POS channel technology provide bandwidth scalability by providing up to 48 STSs or 
VC4-16c of aggregate capacity on either the ML100-12 or the ML1000-2. 
 

 
ML-Series cards feature two SONET virtual ports with a maximum combined bandwidth of STS-
48.  Each port carries an STS circuit with a size of STS-1, STS-3c, STS-6c, STS-9c, STS-12c, or 
STS-24c.  The ML-Series cards support the SONET circuits listed in Table 5-5.