Terms
| Term | Definition |
| Bytes Hit Ratio | The number of bytes of cached out traffic is divided by the sum of the number of bytes of not cached out traffic and cached traffic. For example, a 60% bytes hit ratio means that 60% of the overall bandwidth came from the cache and 40% came from the world. |
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Cache In |
A connection where the object requested by a subscriber does not exist in the cache (creates a “miss”), and the requested incoming data from the world is stored in the cache. |
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Cache Out |
A connection where the object requested by a subscriber exists in the cache (creates a “hit”. See Hit), and the request is served from the cache as outgoing traffic to the subscriber. |
| Cache Productivity | The total cached out traffic is divided by the total cached in traffic. This information is available for all protocols. |
| Clear | The status of a subscriber request when the requested file segment does not exist in the cache. Subsequently, this object is either cached in or forwarded. |
| CMDB Miss | The status of a subscriber request when the requested file segment does not exist in the cache due to an unexpected deletion or corruption. |
| Data | A connection where P2P or HTTP file segments are transferred. |
| Data Non-Data Ratio | The ratio of data to non-data. The average Data Non-Data Ratio is between 1% and 10%. |
| Downstream | Objects are transmitted from the world to the subscriber. Also called W2I. |
| Forward | The process of forwarding an object directly to its requesting subscriber without caching it. This is applied to an object that does not yet exist in the cache. At this stage, it is only listed in the cache, according to the platform's predefined license rules (see Verify), and will only be cached upon future request. |
| Hit | The status of an ISP subscriber request when the requested file segment exists in the cache. Subsequently, this object is cached out. |
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Hit Miss Ratio |
The number of hits is divided by the number of misses. |
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I2W |
Upstream data flows from the ISP to the world. |
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Incoming |
Downstream and upstream objects are transmitted from the redirector |
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IPMI |
Intelligent Platform Management Interface |
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KPI |
Key Performance Indicators |
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Miss |
A subscriber request that does not exist in the UltraBand cache. |
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Non-Data |
A connection through which P2P clients communicate with each other but do not transfer P2P file segments. For example, P2P clients may communicate the details of the file segments and the uploader queue number, but do not transfer the file segments. |
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Outgoing |
Downstream and upstream objects are transmitted out from the redirector. |
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P2P |
Peer to Peer |
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P2PP |
Peer-to-Peer Protocol |
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PBR |
Policy-Based-Routing |
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QoE |
Quality of Experience. Measured by comparing between the speed of traffic served from UltraBand (Cache QoE), and the speed of traffic served from the Internet (Clear QoE). |
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Request Hit Ratio |
The first time a new session arrives in the cache, it is labeled as cache out, cache in, or ignore. The request hit ratio represents the number of cache-out sessions divided by the number of non-cache-out sessions. That is, the request hit ratio measures the percentage of requests delivered from cache versus the world. |
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SNMP |
Simple Network Management Protocol |
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TIC |
Transparent Internet Caching |
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Total traffic |
All the traffic served from both the Internet (incoming traffic) and from UltraBand (cache out traffic), i.e. incoming traffic + cache out traffic. |
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Upstream |
Objects are transmitted from the subscriber to the world. Also called I2W. |
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Verify |
A predefined set of license dependent rules determining the caching |
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W2I |
Downstream data flows from the world to the subscriber. |
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World |
The World Wide Web (WWW). |
Acronyms
| Acronym | Definition |
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CE |
Cache Engine |
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MW |
Maintenance Window |
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MG |
Management Server |
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SP |
Small Platform |
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EP |
Enterprise Platform |
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Dev View |
Developer View |
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CDR |
Content Delivery Record |
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BFD |
Bidirectional Forwarding Detection |
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STP |
Spanning Tree Protocol |
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OSPF |
Open Shortest Path First |
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ISO |
International Organization for Standardization |
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PVST |
Per VLAN Spanning Tree |
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OID |
Object Identifiers |
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MIB |
Management Information Base |
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SNMP |
Simple Network Management Protocol |
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IDRAC |
Integrated Dell Remote Access Controller |
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PBR |
Policy Based Routing |
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ACL |
Access Controls List |
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QOS |
Quality of Service |
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CIDR |
Classless Inter-Domain Routing |
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IP SLA |
Internet Protocol Service Level Agreement |
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CMDB |
Cache Management Database |
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UDP |
User Datagram Protocol |
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IPDB |
IP data base |
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RAID |
Redundant Array of Independent Disks |
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MOP |
Method of Procedure |
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CIDR |
Classless Inter-Domain Routing |
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HASH ID |
A unique identifier for a file that is retrievable |
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CLI |
Command Line Interface |
Priyanka Bhotika
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