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Posts tagged CCIE
OSPF LSA Types
Nov 4th
I can never seem to remember OSPF LSA Types for very long. I can cram them into my head for exams, but a week or so later they’re gone completely. I found a table from Internetwork Expert that is very, very helpful. I’m posting it here so I always have a copy and also in hopes that other people will find it useful as well.
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ODR Lab
Oct 31st
In this article we’ll do a short ODR (On Demand Routing) lab. ODR is a simple routing protocol targeted at hub and spoke topologies, it uses CDP to propagate routing updates. This is one of the technologies that might be on the CCIE exams. I will be including my Dynagen/GNS3 .net file at the end of this post. Here is our topology:
Let’s go through the config:
R1
hostname R1 ! interface Loopback0 ip address 1.1.1.1 255.255.255.255 ! interface Serial0/0 ip address 10.1.0.1 255.255.255.252 ! interface Serial0/1 ip address 10.1.1.1 255.255.255.252 ! interface Serial0/2 ip address 10.1.2.1 255.255.255.252 ! router odr |
We configure the hostname and our Loppback and Serial interfaces. The important command here is “router odr”, this turns ODR on. This command is ONLY run on the hub.
R2:
hostname R2 ! interface Loopback0 ip address 2.2.2.2 255.255.255.255 ! interface Serial0/0 ip address 10.1.0.2 255.255.255.252 |
R3:
hostname R3 ! interface Loopback0 ip address 3.3.3.3 255.255.255.255 ! interface Serial0/0 ip address 10.1.1.2 255.255.255.252 |
R4:
hostname R4 interface Loopback0 ip address 4.4.4.4 255.255.255.255 ! interface Serial0/0 ip address 10.1.2.2 255.255.255.252 |
We now have our hostnames and interfaces configured on R1, R2 and R3. Notice we DO NOT use the “router odr” command on the spokes.
Surprisingly, that is all there is to it! Let’s verify our config:
CCIEv4 Lab Preview
Oct 26th
If you keep up with the Cisco Certification news then you already know about the CCIE change from version 3 to version 4. With this come some interesting changes, namely the addition of the two hour Troubleshooting section to the Lab exam. Wendell Odom gives us a nice run through of the beta lab he got to take:
A Sneak Peek at the CCIE R/S Lab
If you don’t already read Wendell’s blog you should definitely start. He posts wonderfully helpful and informative articles. His archives also have a wealth of information, the CCNA and CCNP Lab articles were invaluable when I was going for those certs.
Basic AToM Lab
Oct 14th
In this article we’ll go over a simple AToM (Any Transport over MPLS) configuration. I’ve been studying MPLS a lot lately and this is my first time playing with AToM and it’s very cool stuff. This article could be useful for anyone studying MPLS and/or CCIP/CCIE topics, or just someone who is interested in learning new things. I will be including my Dynagen/GNS3 .net file with this. Here is our topology:
Let’s go through the config:
P Router:
hostname P ! mpls label protocol ldp mpls ldp router-id lo0 force ! interface Loopback0 ip address 1.1.1.1 255.255.255.255 ! interface FastEthernet1/0 ip address 10.1.1.1 255.255.255.252 duplex auto speed auto mpls ip ! interface FastEthernet1/1 ip address 10.1.2.1 255.255.255.252 duplex auto speed auto mpls ip ! router ospf 100 router-id 1.1.1.1 log-adjacency-changes network 1.1.1.1 0.0.0.0 area 0 network 10.1.1.0 0.0.0.3 area 0 network 10.1.2.0 0.0.0.3 area 0 |
Here we’ve set the hostname, configured the MPLS label protocol (note: LDP is the default on new IOSes), we set a loopback interface that will be our RID for MPLS and OSPF. We also configured our connections to the PE routers and brought up OSPF as our IGP.
PE1 Router:
hostname PE1 ! mpls label protocol ldp mpls ldp router-id lo0 force ! pseudowire-class one encapsulation mpls ! interface Loopback0 ip address 2.2.2.2 255.255.255.255 ! interface FastEthernet1/0 ip address 10.1.1.2 255.255.255.252 duplex auto speed auto mpls ip ! interface Serial2/0 no ip address xconnect 3.3.3.3 100 pw-class one ! router ospf 100 router-id 2.2.2.2 log-adjacency-changes network 2.2.2.2 0.0.0.0 area 0 network 10.1.1.0 0.0.0.3 area 0 |
PE2 Router:
hostname PE2 ! mpls label protocol ldp mpls ldp router-id lo0 force ! pseudowire-class one encapsulation mpls ! interface Loopback0 ip address 3.3.3.3 255.255.255.255 ! interface FastEthernet1/0 ip address 10.1.2.2 255.255.255.252 duplex auto speed auto mpls ip ! interface Serial2/0 no ip address xconnect 2.2.2.2 100 pw-class one ! router ospf 100 router-id 3.3.3.3 log-adjacency-changes network 2.2.2.2 0.0.0.0 area 0 network 10.1.2.0 0.0.0.3 area 0 |
Great MPLS and BGP Lab
Oct 12th
I got this over at Networking-Forum.com, a member named Fred created it, he was even kind enough to provide the Visio diagram, IP scheme spreadsheet and, most importantly, the .net file for Dynagen/GNS3. I spent a lot of my Saturday working on this beast. I thought I should share it here as it is great practice for MPLS VPNs and BGP along with some OSPF, NAT, IPSEC and GRE exposure.
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Internet
* The two Internet routers should serve as transit AS’s. No other routers should permit transit traffic.
* Internet sites (modeled by loopbacks) should be accessible by all lan IP’s.
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