How to achieve link Failover

arpitshrm84
Here to help

How to achieve link Failover

Hi Guys,

 

This is my first query on this forum.

 

We have two ISPs but we are not able to achieve link failover to ISP-2 whenever ISP-1 fails.

 

We got /30 P2P and /29 subnet from both the ISPs. We have connected /30 P2P coming from ISP devices with MS-250 switches which are stacked together. The /29 subnet is used to connect MS stack with MX-100 HA pair. Also we are using Aryaka for WAN optimization so it is also taking one public IP.

 

We can't use /30 P2P for MX-100 pair directly as we need minimum 4 IPs for failover. Hence we have done static routing on the switch stack where it only allows one default route to ISP-1. We can't add default route for ISP-2.

 

So whenever ISP-1 fails there's no route for ISP-2 thus failing both the links. Could anyone of you suggest a better option to achieve failover?

 

Thanks

2 REPLIES 2
nwu1
Here to help

Hi arpitshrm84,

 

Could you possibly upload your topology and desired here so that we can take a look and provide a suggestion? Your correct in that the MS can only have 1 default route.

 

Ultimately, you may want to speak to your SE about this design issue.

 

Cheers,

Nick

 

This is the topology we are having.

 

  • Both ISP-1 & ISP-2 are connected to MS-250(two MS) stacked together through /30 subnet.
  • Two MX-100 in HA mode are connected to MS-250 through /29 subnet in HA mode.
  • Also Aryaka device(two) is connected to MS-250 through /29 subnet only in HA mode.

 

Please let me know if you want any other info.

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