QoS – 1P3Q3T Queuing
April 20th, 2010
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The Cisco 2960, 2970, 3560 and 3750 Catalyst switches support a 1p3q3t que model which provides 3 thresholds in which to drop traffic. Read more…
Archive
Archive for the ‘CISCO’ Category
Cisco QoS Baseline (interim)
April 19th, 2010
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Deciding upon a QoS Classification and Marking strategy can be a difficult task. Cisco have provided certain recommendations which may be implemented as a baseline QoS strategy and then altered over time: Read more…
Basic QoS Model
April 19th, 2010
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The basic QoS Model
Actions at the ingress interface include classifying traffic, policing, and marking: Read more…
QoS – DSCP Classification Guidelines (RFC 4594)
April 19th, 2010
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RFC 4594 describes some example and provides guidelines for DiffServ service classification which may be used as guidelines or as a basis for a QoS Classification Strategy: Read more…
Modular QoS CLI (MQC)
April 19th, 2010
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The Modular QoS CLI (MQC) command structure found in Cisco IOS® Software requires a class map is built incorporating the ACLs that identify the traffic that will have QoS applied to them. Read more…
QoS – Classification and Marking
April 19th, 2010
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The first element to a QoS policy is to classify/identify the traffic that is to be treated differently. Following classification, certain “marking tools” can set an attribute of a frame or packet to a specific value. Such marking (or remarking) establishes a trust boundary that scheduling tools later depend on. Read more…
QoS Markings: Layer 2 and 3 and IPv6
April 19th, 2010
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When data is sent through a network, it is able to be tagged with a “priority value”. When the data passes through a network device, the network device uses that priority value to determine how it should treat the packet. Data can be tagged with a priority value as described in the following article. Read more…
IPv6 EUI-64 Addressing
April 18th, 2010
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Stretch, from Packetlife.net recently produced an excellent article explaining IPv6 and EUI-64 addressing. The article is reproduced, verbatim, here: Read more…
TCP and UDP Small Servers
April 15th, 2010
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TCP and UDP small servers are servers (daemons, in Unix parlance) that run in the router which are useful for diagnostics. Read more…
Configuring CBAC on Cisco 1841
April 10th, 2010
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Context-Based Access Control (CBAC) intelligently filters TCP and UDP packets based on application layer protocol session information and can be used for intranets, extranets and internets. CBAC can be configured to permit specified TCP and UDP traffic through a firewall only when the connection is initiated from within the network needing protection.
CBAC can inspect traffic for sessions that originate from either side of the firewall. This is the basic function of a stateful inspection firewall. Read more…
