MX250 warm spare config

[Newbee_Meraki]

Hi everyone,

I have a question about mx250 warm spare setup.

I have 2 x mx250 with 2 x ISPs and 2 x ms130.

so each ISP is connected to ms130 and they are connected to mx250 like below,

ISP1 - 1st ms130 - 1st & 2nd mx250

ISP2 - 2nd ms130 - 1st & 2nd mx250

I have a single public IP address per ISP so total 2 x public IP.

My question is how to setup warm spare on each mx250.

Upon checking, i need to use mx uplink ip instead of vip due to number of public ip.

Can someone please advise on this? Please let me know if you need further info on this. Thanks in advance.

[RWelch]

MX Warm Spare - High-Availability Pair 

[Newbee_Meraki]

Hi RWelch,

Thank you for the reply.

I have already checked the doc before raised this case here and still confused about IP setting.

There are two option here - VIP & MX uplink IPs

- MX uplink IPs option is not required additional public IP so i should go this one but this means i need 2 x IPs per ISP so one for mx250#1 and the other one for mx250#2?

How about this way. I have mx130 between ISP and mx250 so setup VLAN on ms130 like vlan10 for ISP1,vlan20 for ISP2 and same IP setup on both mx250, 

• mx250#1 WAN1 with ISP1 address
• mx250#1 WAN2 with ISP2 address
• mx250#2 WAN1 with ISP1 address
• mx250#2 WAN2 with ISP2 address

[Newbee_Meraki]

due to warm spare setup, 1st mx250 is active and the 2nd one is standby so IP conflict wont occur.

The benefit of this is i can use a single public IP per ISP. Do you think it will work?

[RWelch · Accepted solution]

There are several posts on the community that go in-depth about the pros/cons of using breakout switches.  It's not a suggested Meraki best practice but there are some links (see link below) about how to achieve what you are wanting to setup.  Personally I would refrain from breakout switches between the ISP and MX.

[Newbee_Meraki]

WOW! 

This is great advice. Thank you very much for your help. huge help!! 🙂

[RWelch]

There are several posts on the community page if you search for breakout switches, this is one of many for your consideration.

How to turn MS120 into WAN breakout for 2 ISPs and 2 MX250s in HA?