Thanks for the reply. what happens in the first scenario if a failure occurs on one of the links and my internal core switch keeps forwarding the traffic over the link that no longers exists?
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Designing for two WAN (non Internet) links.
Hi Guys,
I have tried to make the attached diagram as simple as I could. The scenario is:
Till recently we had only one ISP1 giving us intrasite MPLS VPN connectivity. We ran into major support issues with them and have hence decided to bring in a second ISP2 providing us alternative MPLS VPN links to three of our Site offices spread across two continents. We are sitting in say: Site 1.
At all the three sites, the MPLS links terminate on ISP administered routers (1800 ciscos).
Till now, it was simple, the ethernet interface used to come in and terminate on our L3 core swiitches but the problem starts now when second ISP2 will terminate his connections.
Is there a way I can utilise both the links in a load balancing manner rather than keeping one link purely in the passive way?
Which all routing routers will I have to bring into picture? Can GLBP be of help here? I need to minimise my dependence on this I have to involve ISP1 for they take months to even ad a summarised route onto their network when we raise a request to them.
ISP2 will hopefully be more proactive and they are even willing to administer the 'ISP2 Router1' which will eventually sit in our premises.
Pls advise
- MPLS-103.jpg
- 62 KB
WAN links diagram
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Answers
You can terminate both the ISP routers on your L3 switch 1 and 2 ( refer the attached diagram, you can even use an unmanaged switch for splitting), and do dynamic routing with your ISP routers. IGP like EIGRP or OSPF are easiest to implement equal cost path load balancing.
You will need to do this at all 3 sites. Using a dynamic protocol will enable you to learn if any of the ISP is down.
ISPs generally run BGP within their network but you are fine if you convience them to run EIGRP between your switch and the ISP router. They can redistribute the routes on their router and your L3 switches will knw when the link is down.
Since you are running HSRP between switch 1 and 2, one of them would be active and the other would be passive. If you will not split the link between the ISP router and the L3 switches then you would unnecessarily send traffic over the trunk link between the two switches. It will also take care of the scenario when your primary L3 switch is completely down.
- MPLS-103.jpg
- 65 KB
suggestion to your MPLS architecture
Alternative to the complex cisco configurations and reduce my dependency on ISP1 and 2 for enabling BGP etc., is there a third party alternative who would give the required functionality of 'Links Redundancy', auto failover and certain level of 'load sharing' ot of the box?
If there was a way to increase the points I would have :(
If you want to keep things simple and load balance, then we are back to using equal cost static routes on your core switches. This will load balanace and send half the traffic out of ISP1 and half out of ISP2.
If you want automatic failover, then the best way to do this is using BGP.
what you are trying to do is by its nature complex, and there isn't really a simpler way of doing this.
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by: cstosgalePosted on 2009-03-22 at 15:47:45ID: 23953736
Very simply, at each site, get your core switches to have equal cost routes to each ISPs edge router for your other . you can even do this with static routes, although this won't detect a failure on one of your MPLS links. If you are doing dynamic routing with your MPLS service providers, just manipulate the routing in such a way that you have equal cost routes in your core switches routing tables. They will then automatically load balance between the routes.