Design Reference

Secure Sockets
Layer (SSL)
An Internet security encryption and authentication protocol for secure
point-to-point connections over the Internet and intranets, especially
between clients and servers.
Service Instance
Identifier (I-SID)
The SPBM B-MAC header includes a Service Instance Identifier (I-SID)
with a length of 24 bits. SPBM uses this I-SID to identify and transmit any
virtualized traffic in an encapsulated SPBM frame. SPBM uses I-SIDs to
virtualize VLANs (Layer 2 Virtual Services Network [VSN]) or VRFs
(Layer 3 Virtual Services Network [VSN]) across the MAC-in-MAC
backbone. With Layer 2 VSNs, you associate the I-SID with a customer
VLAN, which is then virtualized across the backbone. With Layer 3 VSNs,
you associate the I-SID with a customer VRF, which is also virtualized
across the backbone.
service level
agreement (SLA)
A service contract that specifies the forwarding service that traffic
receives.
Shortest Path
Bridging (SPB)
Shortest Path Bridging is a control Link State Protocol that provides a
loop free Ethernet topology. There are two versions of Shortest Path
Bridge: Shortest Path Bridging VLAN and Shortest Path Bridging MAC.
Shortest Path Bridging VLAN uses the Q-in-Q frame format and
encapsulates the source bridge ID into the VLAN header. Shortest Path
Bridging MAC uses the 802.1 ah MAC-in-MAC frame format and
encapsulates the source bridge identifier into the B-MAC header.
Shortest Path
Bridging MAC
(SPBM)
Shortest Path Bridging MAC (SPBM) uses the Intermediate-System-to-
Intermediate-System (IS-IS) link state routing protocol to provide a loop
free Ethernet topology that creates a shortest path topology from every
node to every other node in the network based on node MAC addresses.
SPBM uses the 802.1ah MAC-in-MAC frame format and encapsulates
the source bridge identifier into the B-MAC header. SPBM eliminates the
need for multiple overlay protocols in the core of the network by reducing
the core to a single Ethernet based link state protocol, which can provide
virtualization services, both layer 2 and layer 3, using a pure Ethernet
technology base.
shortest path tree
(SPT)
Creates a direct route between the receiver and the source for group
members in a Protocol Independent Multicast—Spare Mode (PIM-SM)
domain.
Simple Loop
Prevention
Protocol (SLPP)
Simple Hello Protocol that prevents loops in a Layer 2 network (VLAN).
single mode fiber
(SMF)
One of the various light waves transmitted in an optical fiber. Each optical
signal generates many modes, but in single-mode fiber only one mode
is transmitted. Transmission occurs through a small diameter core
(approximately ten micrometers), with a cladding that is 10 times the core
Secure Sockets Layer (SSL)
162 Network Design Reference for Avaya VSP 4000 February 2014
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