Design Reference

multiplexing
(CWDM)
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 separates 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.
Customer MAC (C-MAC)
158 Network Design Reference for Avaya VSP 4000 February 2014
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