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Posts tagged BGP
BGP Backdoor Lab
Nov 12th
In this article we’ll be going over the BGP Backdoor feature. This is used in cases where two systems are connected via an IGP, but also receiving routes to the same system through BGP. I stumbled across this feature while checking out one of the labs on Darren’s Blog. The only way I could think of to complete one of his criteria was changing the Administrative Distance of either BGP or the IGP. That is essentially what this feature does, but on a route-by-route basis instead of changing the AD of an entire protocol. I asked Darren if that was the only solution and he pointed me to “BGP Backdoor”. As usual, 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 Serial0/0 ip address 10.1.1.1 255.255.255.0 ! interface Serial0/1 ip address 10.1.3.1 255.255.255.0 ! router bgp 65000 no synchronization bgp log-neighbor-changes neighbor 10.1.1.2 remote-as 65525 neighbor 10.1.3.2 remote-as 65535 no auto-summary |
JUNOS As A Second Language
Oct 27th
So I’ve been realizing how lost I am in JUNOS and it bugs me. I’ve been going through the JSL course that a friend linked me to me awhile back. Juniper offers this course for free (very smart, IMO) and you can view it online or download it. Here’s a blurb from their site:
About This Course
For those of you who are familiar with Cisco's IOS, learning Juniper Networks JUNOS operating system is now made easy with JUNOS as a Second Language. Using an advanced graphical display, this course compares the similarities and the differences between both operating systems and shows the benefits of using JUNOS software. This 90-minute program is designed for network engineers who are already well-versed in Cisco's IOS software but who might not be as familiar with Juniper Networks JUNOS software.
Building on existing IOS configuration knowledge to provide a high-level overview of the JUNOS software, how it works, and how it compares with IOS, this course covers the following:
* JUNOS Software Fundamentals
* The CLI
* Configuration Fundamentals
* Interface Configuration
* Ethernet Interfaces
* Serial Interfaces
* Interface Monitoring
* Firewall Filters
* Routing Protocol Fundamentals
* OSPF
* BGP
Upon completing this program, users who were new to the JUNOS software will now have a good familiarity with it and be a step closer to qualifying to attain the JNCIA-ER certification.
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.
(click image for fullsize)
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.
PeerIX Project
Sep 16th
What is PeerIX:
PeerIX is a project a bunch of other nerds and I are working on. Most of us know each other from HardForum and/or Networking-Forum. The idea is to develop a functional “mini-internet” to learn and gain experience with enterprise and service provider technologies.
What are the requirements?
A network device that supports IPsec, GRE and BGP. Other routing protocols may be considered but will be “corner case” as the core will be eBGP.
What devices work?
Cisco routers
Vyatta
Currently most Cisco routers will work permitted that you are running an IOS that supports the core technologies above.
You can use the IOS feature navigator to verify if your IOS/device supports the required features.
What technologies are you talking about?
The sky is the limit here, but the main core technologies are IPSec, GRE and BGP. Right now we have limited things going on within this network but eventually the hope is to grow it much larger with more services.
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