Question

Site Topology Change recomendation

Asked by: snyderkv

We have 1 HUB and 3 spoke sites A,B,C in a hub-spoke topology using default site settings.

Two of the spoke sites A-B have a physical high speed 100mbps connections requiring 15 minute rep.

My question is, can I link two spoke sites together and reduce the rep interval OR do we keep all the spokes connected to the HUB and lower the rep interval between them instead?

The goal is less convergence time between spoke sites with 100mbps connections between the spokes. There is one physical connection between the HUB and spoke B.

Also, is there anything wrong with creating multiple logical connections to spokes that only have one physical connection to one of the spokes?

The before(top) after(botton). Notice the extra link between A and B at the bottom.
        __15__A    
       /
HUB ----30--B
       \______C
                              Note: HUB---B only physical connection. HUB-A and C are logical.
        __15__A
       /             |  15
HUB ---30---B
       \______C

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Asked On
2009-11-07 at 09:53:45ID24880675
Topic

Active Directory

Participating Experts
1
Points
500
Comments
7

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Answers

 

by: AwinishPosted on 2009-11-07 at 11:50:22ID: 25767752

The replication architect depends on no of factors.

Link speed

Distance between the sites.

No of user in a sites.

Mostly in enterprise replication is scheduled in right time to preserve the bandwidth.

If you make lot of changes in AD or users travel frequently you can have replication configure on 15min basis.

The replication you can configure to have from nearest site to get update from nearest dc.

 

by: snyderkvPosted on 2009-11-07 at 12:50:49ID: 25767977


1) 100 mbps A-B   |   20 mbps HUB to B
2) 1/2 mile A-B   |   Few miles from HUB to B
3) 2000 users in every spoke  |  5000 in HUB
4) Replication is open 24/7 at 30-60 minute intervals (Currently)
5) Lots of changes happen at spokes as well as HUB.

I'm not looking for formulas as much as "best practice" Do we keep our HUB to Spoke layout over a 20mbps llink from HUB or start connecting spokes together due to 100mbps links between those? Does the single physical 20mbps connection to these spokes make a difference in the decision? 20mbps is still very fast for AD replication correct. Currently no queues are building up that I know of.

 

by: snyderkvPosted on 2009-11-07 at 12:59:12ID: 25768009

       ___________A    
       /
HUB ---20-mbps---B
       \___________C

                              Note: HUB---B only physical connection. HUB-A and HUB-C are logical.
        ___________A    
       /                       |  <----100 mbps
HUB ---20-mbps---B
       \___________C

2000 users each spoke
5000 users for HUB

1) Is it or is it not against best practices to create links between spokes due to 100mbps connections?
2) Or is it better to have a single connection to each spoke instead?
     Note: the HUB has a single physical connection to site B. Logical connections exist from HUB-A and C

 

by: AwinishPosted on 2009-11-08 at 12:35:19ID: 25771756

20 MBPS is great speed & as distance between A & B is just half mile & speed is 100 MBPS so replicate A & C from B. You don't require  to make logical connection to Hub for A & C.

You should configure replication for A&C from B.

For MS best practices, they do & test with their own environment so you can explore & if its suiting you it becomes best practice for your environment.

So you can creae multiple connection to the same site & since you have 100 MBPS speed so its better & your Hub will also not get the traffic.

 

by: snyderkvPosted on 2009-11-08 at 15:44:31ID: 25772597

Ah ok so creating links between A-B-C will decrease replication traffic from the HUB.

Sounds good but HUB data to A and C will take two hops instead of one know what I mean? It will take 15 minutes from HUB to B and then 15 Minutes from B-A totalling 30 minutes instead of just 15 from HUB to A (directly) It's two hops instead of one direct connection. What do you think?

 

by: snyderkvPosted on 2009-11-08 at 18:26:57ID: 25773056

Just thought of something. If we lose the connections HUB-A and HUB-C then clients in sites A and C will not look for a DC in the hub when DCs in sites A and C are down.

This negates the bandwidth load benifits by linkig A-B and B-C

The point of linking A-B ad B-C is still to have those sites replicate data faster without having to go back to the HUB and from the HUB to the other sites increasing convergence time (I think is the correct term)

 

by: snyderkvPosted on 2009-12-01 at 22:01:48ID: 25949523

Going with a completely different topology change. Awarded points for Awinish comment

20120131-EE-VQP-002

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