Stretch Single Internet Service Across Dual MX Units

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_Mark_
Conversationalist

Stretch Single Internet Service Across Dual MX Units

Hi,

 

Is it possible to stretch a single internet service using a /30 across a dual MX configuration using a layer 2 switch? Like the attached diagram.

 

Our service providers are generally unwilling to provide a /29 range or a dual-hand off, but we want to be able to have this connection to both MX devices at a site as a warm spare. We've had some partners at a high-level comment that it's possible but haven't actually seen it work and would expect we need to use a layer 3 switch in between.

 

Layer 2 Example:

_Mark__0-1643841732610.png

 

Layer 3 Example:

_Mark__1-1643841787923.png

 

1 Accepted Solution
cmr
Kind of a big deal
Kind of a big deal

@_Mark_ in a word, no.  You would either need a router and NAT the 1 IP to an internal 2-3 IPs or get a /29.  Each MX needs a public IP in the same subnet on the WAN port and ideally a third floating one (virtual IP) that the traffic actually uses.

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2 Replies 2
cmr
Kind of a big deal
Kind of a big deal

@_Mark_ in a word, no.  You would either need a router and NAT the 1 IP to an internal 2-3 IPs or get a /29.  Each MX needs a public IP in the same subnet on the WAN port and ideally a third floating one (virtual IP) that the traffic actually uses.

_Mark_
Conversationalist

Thanks, that is the solution we were coming too. Great to have confirmation.

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