Solved

Multicast in a layer 2 to layer 3 migration

Posted on 2016-10-18
1
85 Views
Last Modified: 2016-10-22
I have 10 buildings and they are connected via fiber in a ring topology. It is currently layer 2 with the core at one building doing the routing. I am in the process of implementing EIGRP between the building to keep STP locally to the building. I have a couple of questions:
- Will it be a downtime when I start configuring EIGRP?
- Can I perform the work remotely?
- My network currently has multicast routing running with auto-RP. Will multicast be affected by the migration to layer 3?

Thanks
0
Comment
Question by:leblanc
[X]
Welcome to Experts Exchange

Add your voice to the tech community where 5M+ people just like you are talking about what matters.

  • Help others & share knowledge
  • Earn cash & points
  • Learn & ask questions
1 Comment
 
LVL 30

Accepted Solution

by:
Predrag Jovic earned 500 total points
ID: 41849435
I have 10 buildings and they are connected via fiber in a ring topology. It is currently layer 2 with the core at one building doing the routing.
Extremely bad STP is created for 7 "hops" diameter max.-
Will it be a downtime when I start configuring EIGRP?
Yes. Since, most liklely, you can't just implement EIGRP you also will need to change IP address ranges on local VLANs in buildings. In the case that you don't have to rearrange IP addresses you still need to change location of default gateway so default gateway will have different MAC address and you can expect at least 15 to 45 seconds of downtime for hosts, in some cases even longer (arp need to be cleared on hosts and switches - manually or automatically). However, with a careful planning it could be smooth implementation but sure there will be downtime... Do not forget that if you want move links between buildings to EIGRP most likely you will need do reconfigure VLANs, since you can't have the same IP address ranges on 2 locations.  
Can I perform the work remotely?
Yes, with extremely good planning of the steps (one wrong step order and you cut yourself from the network or a part of the network permanently). The first issue reload command and start to work. :)
My network currently has multicast routing running with auto-RP. Will multicast be affected by the migration to layer 3?
Sure it will. You are moving from L2 to L3 topology between buildings, that fact alone is enough to disrupt traffic flow and there may be need to reconfigure multicast configurations.

Another architectural part:
It would be highly recommendable for more than 3 buildings to implement some other topology (with redundant core switches), not just to move links between buildings to L3. Ring topology is simply not flexible enough.
0

Featured Post

Online Training Solution

Drastically shorten your training time with WalkMe's advanced online training solution that Guides your trainees to action. Forget about retraining and skyrocket knowledge retention rates.

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

I had an issue with InstallShield not being able to use Computer Browser service on Windows Server 2012. Here is the solution I found.
This article will inform Clients about common and important expectations from the freelancers (Experts) who are looking at your Gig.
After creating this article (http://www.experts-exchange.com/articles/23699/Setup-Mikrotik-routers-with-OSPF.html), I decided to make a video (no audio) to show you how to configure the routers and run some trace routes and pings between the 7 sites…
If you're a developer or IT admin, you’re probably tasked with managing multiple websites, servers, applications, and levels of security on a daily basis. While this can be extremely time consuming, it can also be frustrating when systems aren't wor…

688 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question