Archive for June, 2007
BGP allowas-in, BGP local-as tips and tricks…
BGP Local-AS
BGP allows you to manipulate your Autonomous System (AS) number in a number of different ways including confederations, local-as, and remote-as commands. This article focuses on manipulating your AS as seen by other remote AS’s using the local-as command. We will also look at some tips and tricks using this in conjunction with BGP [...]
Implementing Weighted Fair Queing, Part II
But Wait…theres still more! QoS Group based WFQ
In my previous article on WFQ, we really only talked about flow based WFQ. Flow based WFQ automatically sorts out traffic flows or conversations into separate queues. Smaller flower get precedence over larger flow. But what about frames that are classified with a QoS marking. If we have [...]
Implementing Weighted Fair Queuing
Fairness for the Little Guy.
Weighted Fair Queue (WFQ) is another congestion management strategy. It is very different from the other two congestion management strategies we have looked at (PQ and CQ), in that it does not need classification options configured. Traffic is automatically sorted and put into different queues without any kind of access-list [...]
CAR & CIR – What the hell is the difference?
What is the difference?
When we are talking about Committed Information Rate we are usually talking about Traffic Shaping. This is especially true of Frame Relay Traffic Shaping (FRTS). In FRTS we might configure a CIR with the frame-relay cir command:
For example:
interface serial0
encapsulation frame-relay
frame-relay traffic-shaping
frame-relay interface-dlci 200
class adjust_vc_class_rate
!
map-class frame-relay adjust_vc_class_rate
frame-relay cir [...]
VLAN Access Lists
I read this over on group study, which i thought was a really good example of how of why in the CCIE lab we should try and deny the traffic you don’t want and permit the rest. You will probably run into a lot less trouble. This goes against the usual security advice of permit [...]
Configuring Custom Queuing
In my previous post, I talked a little bit about congestion management focusing on priority queuing. Priority queuing is great in making sure that VIP traffic gets to looked first dibs on that output queue when congestion occurs. The problem with priority queuing was starvation. If there was frames always waiting in the high queue [...]
Configuring Priority Queuing
What is Congestion Management?
Priority Queuing is a QoS congestion management mechanism. What the hell is a congestion management mechanism I hear you ask? Congestion management is how a router deals with what happens when its output queue is full. A router can’t really do much to control traffic, all it does is collect frames, figure [...]
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