I just finished the bridging section of the cod yesterday and was going to do a write up on it, but Barooq has his up on cciecandidate. It is a good write up, and worth reading just to get a brief overview.

Bridging is an obscure topic in CCIE R&S study.
It can be divided in three types

1) IRB (Integrated Routing and Bridging)
2) CRB (Concurrent Routing and Bridging
3) Fall back bridging

IRB is discussed in Lab 3 of internetworkExpert labs.

Basically IRB and CRB are generally used on routers to bridging different VLAN domains. If IRB is used, we can route IP over these bridged interfaces. The topic that is least discussed is Fall Back Bridging that we configure on switches. It is basically for non-IP traffic, and thats why chances of it appearing on the LAB are slim.

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I happened across CCIE Pursuit’s post today and was shocked at what I read. You can read his whole post here. Sometimes I sit and wonder if all this time I take away from my family really worth it? Today I skipped a picnic at my wife’s mom’s house. There are alot of times I skip little things with the family and so forth. It just got me thinking about everything. I will crawl ahead, but I am starting to think I will skip less time with everyone…

I wish the best for his wife and children in their time ahead.

I missed this post last week, but caught it from my igoogle home page. It is a interesting read.There is a good point made asking can you really test someone’s design ability on with a computer based test?

At the beginning of this year, Cisco launched the written test for its Cisco Certified Design Expert (CCDE) program, which lets IT pros demonstrate expertise in network infrastructure design principles and fundamental concepts.

The missing piece – until now – was the practical exam. How would Cisco create a test to objectively measure network design, which some would argue is far from being an exact science?

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A good read for your QOS studies…

“Look at the diagram above. Both router links are clocked at 128Kbps, and the test packet flow has packet size of 1000 bytes each, being sent at a sustained rate of 16 packets per second, effectively saturating the 128Kbps link. Consider what happens when we shape the flow down to 64Kbps. Egress packets are also serialized at 128Kbps – therefore the shaper needs to buffer and delay packets to obtain the target average rate of 64Kbps. Shaper performs that by delaying every burst each Tc interval. For this example, the Bc value (shaper burst) equals to packet size, so effectively every 1/16s interval egress link is busy and the next 1/16s interval it is idle. The average bps rate is total volume of (4*1000) divided by 1/2s (time to send) and multiplied by 8 (to get bps) yielding the result of 64000bps.”

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…If you purchase a bootcamp seat. You do not need to pick a date from what I can tell, you just need to reserve a seat. This seems like a pretty good deal, it would be like getting the full end-to-end program from Internetwork Expert free with signing up for a boot camp.

If you are unable to attend a bootcamp you can also purchase the blended solution for only $999. I don’t use IPexpert for my material so this is coming from a neutral voice 🙂

My question is do you get to attend a Narbik camp for the free material?

Full link here

Very interesting news. Last week when I was given a heads up about some big news coming from IPExpert after the Scott Morris news I was thinking that this was going to happen. I figured how many other big free agent CCIE trainers were out there in the world? This does make for some very interesting news today…

“It is with great excitement that we reunite with Narbik Kocharians to offer the most incredible CCIE training value available anywhere! Narbik is a well-recognized triple-CCIE with an outstanding name in the CCIE training space, known for his unique style and magnetic personality.”

Full link here

I always lose my bookmark for this command and have to search around for it so thought I would toss it up on the blog.

If you want to upgrade your switch IOS and use the http device manager and don’t already use it you need to upgrade your current version from the command line using:

archive download-sw tftp://tftp_server_ip/image_file_name

There are two options you can use:

/leave-old-sw leaves the current version there incase you need to downgrade or have issues

/overwrite to overwrite your current verison

If you are upgrading from a normal .bin image you will have to erase that image file from flash or you will not have enough space.

Once you have the device manager running you can always upgrade it right through the site itself.

Completed tasks

  • Day 5 of the internetwork expert cod
  • Some multicast volume 1 labs

Goals for this week

  • Complete day 6 of the internetwork expert cod
  • Start taking a look at the RIP volume 1 beta labs

Well it was a quiet week for studying. I did get through day 5 and onto day 6 this week. I am hoping with the holiday weekend coming up I can finish all of day 6 and get into day 7, but I am not counting on it.

My wife will hit 37 weeks next week or so. In all honestly I could get the call at anytime that her water broke. She has been packing her bag and prepping everything for the hospital. I tried to sneak in a few Cisco press books in my food bag she packed, but once those were found they just became flying projectiles through the house. I don’t think she is going to let me bring my laptop to lab on Dynamips the whole time either.

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He writes a great blog and is moving on to his CCNP. Send him a congrats if you get a chance!

CCNA pass post

This is a basic example of a Dynamic ACL by allowing web access to a remote server. What we are doing here is allowing a host (R1’s vlan network) to access a web server ( R2’s vlan network) on a remote box. Again this is basic as it is going to get.

First configure the access-list on R2 for the Dynamic ACL

  • access-list 101 permit tcp any any eq 23 (we need to allow telnet through so we can authenticate. Now we can get away without this line here since we have permit ip any any at the bottom of the ACL. This will all depend on how you have to build out the ACL if you need this or not.)
  • access-list 101 dynamic HTTP permit tcp any any eq 80 (we could specify a specific host that is allowed access here or a subnet but we want to allow anyone that can authenticate for this example.)
  • access-list 101 deny tcp any any eq 80 (Here we are blocking access to anyone that doesn’t authenticate for web traffic.)
  • access-list 101 permit ip any any (Here we are allowing the rest of the incoming traffic in.)

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