Design Reference

separates a network into administrative domains called Maintenance
Domains (MD).
Customer MAC (C-
MAC)
For customer MAC (C-MAC) addresses, which is customer traffic, to
forward across the service provider back, SPBM uses IEEE 802.1ah
Provider Backbone Bridging MAC-in-MAC encapsulation. The system
encapsulates C-MAC addresses within a backbone MAC (B-MAC) address
pair made up of a BMAC destination address (BMAC-DA) and a BMAC
source address (BMAC-SA).
dense wavelength
division multiplexing
(DWDM)
A technology that uses many optical signals (16 or more) with different
wavelengths to simultaneously transmit in the same direction across one
fiber, and then separate by wavelength at the distant end.
Designated
Intermediate System
(DIS)
A Designated Intermediate System (DIS) is the designated router in
Intermediate System to Intermediate System (IS-IS) terminology. You can
modify the priority to affect the likelihood of a router being elected the
designated router. The higher the priority, the more likely the router is to be
elected as the DIS. If two routers have the same priority, the router with the
highest MAC address (Sequence Number Packet [SNP] address) is elected
as the DIS.
Global routing
engine (GRE)
The base router or routing instance 0 in the Virtual Routing and Forwarding
(VRF).
Intermediate System
to Intermediate
System (IS-IS)
Intermediate System to Intermediate System( IS-IS) is a link-state, interior
gateway protocol. ISO terminology refers to routers as Intermediate
Systems (IS), hence the name Intermediate System to Intermediate System
(IS-IS). IS-IS operation is similar to Open Shortest Path First (OSPF).
In Shortest Path Bridging MAC (SPBM) networks, IS-IS discovers network
topology and builds shortest path trees between network nodes that IS-IS
uses for forwarding unicast traffic and determining the forwarding table for
multicast traffic. SPBM employs IS-IS as the interior gateway protocol and
implements additional Type-Length-Values (TLVs) to support additional
functionality.
Internet Protocol
security (IPsec)
A secure version of the Internet Protocol (IP) that provides optional
authentication and encryption at the packet level.
jitter The delay variance between received packets. Packets may not arrive at
the destination address in consecutive order, or on a timely basis, and the
signal can vary from its original reference timing. This distortion damages
multimedia traffic.
last member query
interval (LMQI)
The time between when the last Internet Group Management Protocol
(IGMP) member leaves the group and the stream stops.
Glossary
152 Network Design Reference for Avaya VSP 4000 Series December 2014
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