Cisco switches and smartport macros

Smartport macros are not more than some templates you can define on Cisco switches that will apply the same configuration on multiple ports. It’s not a subject that needs too many discussions, but it can be useful for your Cisco certification preparation or real life Cisco switch administration.

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Cisco STP forward-time command trick

This is more a topic for exams, like Cisco CCIE, but also it can appear in real-world environments.

Consider the following simple topology:
Simple L2 topology

SW1 is the spanning-tree root bridge for all VLANs. Imagine that you have a request which ask you that when a port becomes active, no matter of VLAN, it should wait 10 seconds until it transition to forwarding state.

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EtherChannel over 802.1q Tunneling

Consider the following topology:
EtherChannel over 802.1q Tunneling Topology

We have one Customer with two distributed locations (SW1, R1 and SW2, R2) connected over Provider backbone. What we want to create is something like this:

EtherChannel over Provider L2 cloud

If Provider support 802.1q and L2 tunneling we can achieve a nice Etherchannel between our 2 remote locations with direct CDP visibility. Also STP and VTP is supported, just like when these SW1 and SW2 switches are directly connected.

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Cisco 2600: How many IPv4 prefixes can fit in BGP table

Today I wanted to try and see how many IPv4 prefixes can a Cisco 2600 accommodate in BGP table both global and in VRF table. I have lying around a Cisco 2621XM with 64MB of RAM, so I said to stress it a bit like in the old days when it was productive.

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CCIE Home Lab, what to do when your router has too little Flash space for IOS

I already explained in an older post my home lab for CCIE preparation. My BB1-BB3 routers are Cisco 2600 series and the rest of R1-R6 are emulated with Dynamips. The only problem is that one of the C2600 has too little Flash space to hold the required IOS. Memory is sufficient, but Flash not.

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Overlay MPLS over provider backbone

Imagine that you have two or more sites which you want to connect together using MPLS technology. You cannot afford dark fiber and your Service Provider cannot offer you L2 connections of any kind. The only thing your SP can offer is L3 transport. Still, you want to build your own MPLS environment and there is no way to convince your SP to enable CsC.

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MSFC, PFC and DFC on Cisco 6500 series

If you are in routing and switching industry, it’s almost impossible not to hear words like MSFC, PFC and DFC in relation with Cisco Catalyst 6500 series, chassis, supervisor and modules. If you didn’t yet, you’re not almost there, working with large enterprise environments.

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[Twitter IT] Cisco Live 365 – Cornerstones of CCIE Success

Cisco Live 365 describe this as:

“Anthony Sequeira, CCIE, CCSI educates students on four key cornerstones for success in the journey to CCIE. These cornerstones include technical knowledge, study and lab strategies, proper mindset, and physical wellness.”

I can tell you it’s not essentially a technical knowledge session, and Anthony Sequeira mention this couple of times during presentation. Nevertheless this it’s damn good for your CCIE preparation and exam itself. What Anthony Sequeira does, he tries to “educate” the attendant behavior pre and during the exam so he or she won’t go crazy. If you have a Cisco Live 365 account (it’s free to subscribe) I would recommend this presentation.

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