Understanding Private VLANs
You may want to see the updated version of this post at: http://blog.internetworkexpert.com/2008/07/14/private-vlans-revisited/ — Private VLAN concepts are quite simple, but Cisco’s implemenation and...
View ArticleBridging the gap between 3550 and 3560 QoS: Part I
The 3560 QoS processing model is tightly coupled with it’s hardware architecture borrowed from the 3750 series switches. The most notable feature is the internal switch ring, which is used for the...
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Quick Notes on the 3560 Egress Queuing
The goal of this article is to discuss how would the following configuration work in the 3560 series switches: interface FastEthernet0/13 switchport mode access load-interval 30 speed 10 srr-queue...
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UDLD Modes of Operation
UDLD (Unidirectional Link Detection) is Cisco proprietary extension for detecting a mis-configured link. The idea behind it is pretty strighforward – allow two switches to verify if they can both send...
View Article802.3x Flow-Control
Generally, flow-control is a mechanics allowing the receiving party of a connection to control the rate of the sending party. You may see many different implementations of flow-control technologies at...
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Private VLANs Revisited
Due to the non-decreasing interest to the post about Private VLANs, I decided to make another one, more detailed – including a diagram and verification techniques. Introduction To begin with, recall...
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Comparing Traffic Policing Features in the 3550 and 3560 switches
People are often confused with per-VLAN classification, policing and marking features in the Catalyst 3550 and 3560 models. The biggest problem is lack of comprehensive examples in the Documentation...
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Traffic Classification in the 3550/3560 Switches
In this post we will look at the basic classification and marking features available in the 3550 and 3560 switches. Basic features include packet marking using port-level settings and port-level...
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How well do you know VTP?
Here ye, here ye, VTP experts. (We are not referring to the Vandenberg Test Program, although they are very likely experts in their field as well. ) Can you predict the results of a 3 switch VTP...
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