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Archive for June, 2007

BGP allowas-in, BGP local-as tips and tricks…

By Arden Packeer, CCIE #20716 ⋅ June 15, 2007 ⋅ 4 comments

Thanks for visiting! If you’re new here, you may want to subscribe to my RSS feed. This blog posts regular tutorials, news, and study tips about networking, especially about Cisco CCIE related topics. Go ahead, subscribe to the rss feed! You can also receive updates from this blog via email. Thanks for visiting!BGP Local-AS
BGP allows [...]

Implementing Weighted Fair Queing, Part II

By Arden Packeer, CCIE #20716 ⋅ June 14, 2007 ⋅ Post a comment

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

By Arden Packeer, CCIE #20716 ⋅ June 14, 2007 ⋅ Post a comment

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?

By Arden Packeer, CCIE #20716 ⋅ June 13, 2007 ⋅ Post a comment

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

By Arden Packeer, CCIE #20716 ⋅ June 13, 2007 ⋅ Post a comment

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

By Arden Packeer, CCIE #20716 ⋅ June 12, 2007 ⋅ Post a comment

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

By Arden Packeer, CCIE #20716 ⋅ June 11, 2007 ⋅ One comment

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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