MLAG issue

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we want to createing MLAG between 2 switches X620. During MLAG creation does IP of all VLAN between 2 switches be same using or same subnet range using.
Suppose that 2 switches(X620) we have and we have 5 vlan and there vlan-IP applied on switch-1. Does IP of all vlan's of switch-1 would be same using on switch-2 or any same subnet range.
Switch-1(X620)
VLAN2=192.168.1.2
VLAN3=10.10.10.1
Switch-2(X620)
VLAN2=192.168.1.2
VLAN3=10.10.10.1
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Alok Shukla

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Posted 9 months ago

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Andrew Imam, Alum

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Hi Alok,

If you intend to configure/enable VRRP on each of the MLAG peers to provide Layer 3 Gateway Redundancy, then for each VLAN you can assign a unique IP address and configure another IP address to be used for VRRP (the same IP on both switches). For example:

Switch-1(X620)
VLAN2=192.168.1.2/24 /VRRP IP=192.168.1.254/24
VLAN3=10.10.10.2/24 /VRRP IP=10.10.10.254/24
Switch-2(X620)
VLAN2=192.168.1.3/24 /VRRP IP=192.168.1.254/24
VLAN3=10.10.10.3/24  /VRRP IP=10.10.10.254/24

As part of your network design, you would need to determine whether you want to setup VRRP with one switch as the VRRP master and the second switch as the VRRP Backup or you would like to have Active-Active VRRP.

Please let us know if you have any other questions.
Thank you.

Best regards,
Andrew 
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Alok Shukla

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 For Creatting VRRP which is best for me VRRP active- active or active-standby?
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Sushruth Sathyamurthy, Employee

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Active-active can be used. You will need to write an ACL to block the VRRP advertisements in order to achieve this. Andrew has attached a link to an article earlier in this thread.
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Grosjean, Stephane, Employee

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Starting with 16.1 (16.2?), you have Fabric Routing to do that active/active VRRP without the ACL trick.
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Alok Shukla

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How do we create root bridge for Switch-A to vlan-1 and root bridge for Switch-B to vlan-2 in MLAG?
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Erik Auerswald, Embassador

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You don't, MLAG uses all links at the same time. STP is not supported on MLAG ports on EXOS, see e.g. "Can I combine MLAG and STP?".
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Nick Yakimenko

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How are you going to define connection to switch-1 and switch-2 within a single vlan, having same ip?
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Alok Shukla

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How do we create root bridge for Switch-A to vlan-1 and root bridge for Switch-B to vlan-2 in MLAG?
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Erik Auerswald, Embassador

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Hi Alok,

with MLAG you do not define a root bridge. You define a root bridge for STP, but EXOS does not allow the use of STP on an MLAG port.

Thanks,
Erik