Cisco Router IOS XR Getting Started Manual page 211

V
vertical cavity surface emitting laser.
VCSEL
A vm file is a Cisco IOS XR software file that can be installed from ROM Monitor mode. A vm file is
vm
typically used to install the Cisco IOS XR software when the software has not yet been installed or has
been corrupted.
Virtual Private Network. Enables IP traffic to travel securely over a public TCP/IP network by
VPN
encrypting all traffic from one network to another. A VPN uses "tunneling" to encrypt all information
at the IP level.
W
Weighted Random Early Detection. Queueing method that ensures that high-precedence traffic has
WRED
lower loss rates than other traffic during times of congestion.
X
Extensible Markup Language. A standard maintained by the World Wide Web Consortium (W3C) that
XML
defines a syntax that lets you create markup languages to specify information structures. Information
structures define the type of information, for example, subscriber name or address, not how the
information looks (bold, italic, and so on). External processes can manipulate these information
structures and publish them in a variety of formats. XML allows you to define your own customized
markup language.
A process on the router that is sent XML requests by XML clients and is responsible for carrying out
XML agent
the actions contained in the request and returning an XML response back to the client. The XML Agent
for CORBA is an example of an XML agent provided on the Cisco CRS-1 router.
An external application that sends an XML request to the router and receives XML responses to those
XML client
requests.
A portion of an XML request that specifies an operation that the XML client would like the XML agent
XML operation
to perform.
The router code that carries out a particular XML operation including parsing the operation XML,
XML operation
performing the operation, and assembling the operation XML response
provider
An XML document sent to the router containing a number of requested operations to be carried out.
XML request
The response to an XML request.
XML response
An XML document specifying the structure and possible contents of XML elements that can be
XML schema
contained in an XML document.
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Cisco IOS XR Getting Started Guide
Glossary
GL-13