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REVIEW DRAFT—CISCO CONFIDENTIAL
Glossary
GL-3
Cisco Prime Network 4.0 User Guide
OL-29343-01
G
GRE
Generic routing encapsulation (GRE) is a tunneling protocol, originated by Cisco Systems and
standardized in RFC 2784. GRE encapsulates a variety of network layer packets inside IP tunneling
packets, creating a virtual point-to-point link to devices at remote points over an IP network.
H
Home Agent
A router on a mobile node’s home network which tunnels datagrams for delivery to the mobile node
when it is away from home. It maintains current location (IP address) information for the mobile node.
It is used with one or more foreign agents.
HSGW
HRPD Serving Gateway, a component in the evolved High Rate Packet Data (eHRPD) mobile
network. It terminates the eHRPD access network interface from the Evolved Access Network (eAN)
or Evolved Packet Core Function (ePCF) and routes UE-originated or terminated packet data traffic.
HSRP
Hot Standby Router Protocol (HSRP) is a protocol that provides backup to a router in case of failure.
Using HSRP, several routers are connected to the same Ethernet network segment and work together
to present the appearance of a single virtual router.
H-VPLS
Partitions the network into several edge domains that are interconnected using an MPLS core. The
edge devices learn only of their local N-PE devices and therefore do not need large routing table
support.
I
IP Multicast
A bandwidth-conserving technology that reduces traffic by simultaneously delivering a single stream
of information to thousands of corporate recipients and homes.
IP Pool
An IP pool is a sequential range of IP addresses within a certain network. IP addresses can be assigned
dynamically from a single pool or from a group of pools for services running on a network element.
IPSec
The Internet Protocol Security suite that interacts with one another to provide secure private
communications across IP networks.
IS-IS
Intermediate System-to-Intermediate System (IS-IS) protocol is a routing protocol developed by the
ISO. It is a link-state protocol where IS routers exchange routing information based on a single metric
to determine network topology.
L
LAC
Layer 2 Tunnel Access Concentrator, which allows users and telecommuters to connect to their
corporate intranets or extranets using L2TP. In other words, it forwards packets to and from the LNS
and a remote system.
link
A physical or logical connection between two devices in the network, a device and an aggregation, or
two aggregations.