Design Reference

link-state database
(LSDB)
A database built by each OSPF router to store LSA information. The router
uses the LSDB to calculate the shortest path to each destination in the
autonomous system (AS), with itself at the root of each path.
load balancing The practice of splitting communication into two (or more) routes or servers.
MAC-in-MAC
encapsulation
MAC-in-MAC encapsulation defines a BMAC-DA and BMAC-SA to identify
the backbone source and destination addresses. The originating node
creates a MAC header that the device uses for delivery from end to end. As
the MAC header stays the same across the network, there is no need to
swap a label or do a route lookup at each node, allowing the frame to follow
the most efficient forwarding path end to end.
management
information base
(MIB)
The MIB defines system operations and parameters used for the Simple
Network Management Protocol (SNMP).
multicast router
discovery (MRDISC)
Provides the automatic discovery of multicast-capable routers. By listening
to multicast router discovery messages, Layer 2 devices can determine
where to send multicast source data and Internet Group Management
Protocol (IGMP) host membership reports.
multihomed AS
An autonomous system that has multiple connections to one or more
autonomous systems and does not carry transit traffic.
multiplexing Carriage of multiple channels over a single transmission medium; a process
where a dedicated circuit is shared by multiple users. Typically, data
streams intersperse on a bit or byte basis (time division), or separate by
different carrier frequencies (frequency division).
next hop
The next hop to which a packet can be sent to advance the packet to the
destination.
not so stubby area
(NSSA)
Prevents the flooding of external link-state advertisements (LSA) into the
area by providing them with a default route. An NSSA is a configuration of
the Open Shortest Path First (OSPF) protocol.
out of band (OOB) Network dedicated for management access to chassis.
packet loss Expressed as a percentage of packets dropped over a specified interval.
Keep packet loss to a minimum to deliver effective IP telephony and IP
video services.
policing Ensures that a traffic stream follows the domain service-provisioning policy
or service-level agreement (SLA).
Protocol Data Units
(PDUs)
A unit of data that is specified in a protocol of a specific layer and that
consists of protocol-control information of the specific layer and possibly
user data of that layer.
Glossary
154 Network Design Reference for Avaya VSP 4000 Series December 2014
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