MPLS Redundancy

[musthafa786]

Now I have one 2 MB link to ISP for MPLS , I need to get one more link for redundancy.

For the MPLS redundancy , which is good , going through same ISP or different ISP ? , need help . thanks

Regards,

Musthafa

[Giuseppe Larosa · Accepted solution]

Hello Musthafa,

for using a second MPLS SP all sites need to be connected to it.

From a redundancy point of view it would be better to use a different MPLS SP

Edit:

if you want to add redundancy to only one site there is no other choice then using the same MPLS SP

Hope to help

Giuseppe

[Liam Kenneally · Accepted solution]

Hi Musthafa,

If you have a single ISP & dual lines you will obviously have gateway redundancy(assuming you have two gateway routers). This however only provides hardware redundancy. For example if a gateway router goes pop, or a interface card fails. This however will NOT provide failover if your ISP goes down for some reason for example a fault on the line(s). Roadworkers dig though your lines or a fault at your EXCHANGE/POP.

Dual ISP - allows two lines one from each ISP, this will allow complete redundancy. This means if you loose an ISP to one of the faults above you will have the other ISP to fall back on.  If you want hardware redundancy aswell like stated above you will need two lines in from each ISP. One line to each gateway router.

One thing to note is as follows:- if you go with DUAL ISPs you MUST ensure your secondary carrier is not using your primary carriers infrastructure.

For Example in the UK.

If you use BT(British Telecom) as your primary ISP & Eclipse secondary ISP. This will NOT Provide ISP redundancy as Eclipse use BT(British Telecom) infrastructure. So if a roadworkers digs through BT lines it will take out both BT & Eclipse.

You need to source two ISPs that reside on their OWN infrastructure(Their own lines, own EXHANGES/POPs Etc.)

An example of this would be to have for example BT & Virgin Media. who both have their own infrastructure.

NOTE:- All ISPs you need to look at will need to be MPLS SPs and additionally you will have to use the same two SPs across all sites for redundancy to work.

HTH.

Kind Regards,

Liam

Musthafa

Musthafa

Musthafa

[Giuseppe Larosa · Accepted solution]

Hello Liam,

>> One thing to note is as follows:- if you go with DUAL ISPs you MUST ensure your secondary carrier is not using your primary carriers infrastructure.

very good point

Best Regards

Giuseppe

[musthafa786]

Hi Giuseppe,Laim,

Sorry , I didnt get exactly what u meant by " if you go with DUAL ISPs you MUST ensure your secondary carrier is not using your primary carriers infrastructure" point,  Could you explain more , thanks

Regards,

Musthafa

[Liam Kenneally · Accepted solution]

Musthafa

Musthafa

Hi Musthafa,

ISPs will Piggyback off of eachothers infrastructure for a number of reasons. Normally for geographical reach.

What this means is that an ISP (ISPA) will contact another ISP (ISPB) and say "If I pay you XYZ can you connect me to this region" this will allow ISPA to sell their service in a region they couldnt previosly reach....

Now what this means is that a customer in this defined geographical region buys 'redundant lines' from ISPA & ISPB... however if ISPB fails who is connecting the end user to ISPA. Both connections will drop as ISPA is connecting to the end-user via ISPB

What you need to do is find two ISPs that have their own infrastructure! not renting it off another ISP.

If you ring up your ISP and say for redundany reasons I need two independant carriers my primary ISP is ISPA they will go, sorry we cannot provide you this service as we connect to your building via ISPA.

Alternitivly they might say we have our own POP in your local area, which connects to our VPLS/MPLS backbone. We just need to charge you XYZ to run a line into your building.

I Hope this makes sence!

Kind Regards,

Liam

[musthafa786]

Hi Liam,

Thanks for your clarification.

do u think same ISP can give MPLS redundancy ?, In my case only single ISP is available.

if single ISP can provide local loop redundancy and  EXHANGES/POP redundancy would be ok for MPLS redundancy ?

Regards,

Musthafa.

[Liam Kenneally · Accepted solution]

Hi Musthafa,

No problem at all

If a single ISP is you only option redundant links to that ISP is always better then no Redundancy.

ISPs normally have very good SLAs anyway meaning faults on the lines are normally resolved very quickly.

For example if a line is cut it will affect multiple companies not just yourself, so support calls will be raised very quick. Therefore your ISP will mark it as urgent and have it fixed ASAP.

Additionally their is always the chance that their could be a fault on one of your lines but not the other therefore two lines would be an advantage.

Advantages of two lines from a single ISP are as follows

1. Redundancy on your site as I explained above as 'Hardware redundancy'
2. You can load balance traffic, for more efficient use of your lines.
3. If their is a fault on a single ISP line you have a backup.

HTHs

Kind Regards,

Liam

[milan.kulik · Accepted solution]

Hi,

To get a really  reliable backup line from the same ISP, you need to be sure it does not share any piece of the ISP infrastructure with the primary line. So you need to ask a special cable trace from the ISP. And you need two diverse cable entries to your site.

Possibly earth cable plus a radio link is the easiest way?

HTH,

Milan

[musthafa786]

Thanks all for your valuable information...

Regards,

Musthafa