Configuring 2 SVIs with the same IP Addresses in 2 Separate Switches.

Configuring 2  SVIs with the same IP Addresses in 2 Separate Switches.

Just  want to verify if  this is doable:
let's say we have ESX host with Network adapters teamed up, and each Network adapter is connected to separate switch (same Vlans) , on each Switch the SVI (Switch Virtual IP address) is the default gateway for ESX Host using the teamed NICs.
Example

ESX Host 1 has NIC1 and NIC2  teamed up with IP address : 192.168.12.80
NIC1 is physically connect to Switch 1 and NIC2 is connected to Switch2
on Switch1 we configure SVI with IP address 192.168.12.81 and on Switch2 we configure SVI with same IP address 192.168.12.81

ESX Host Default Gateway : 192.168.12.81

OR

 we have to give 2 different IP addresses for each SVI? for instance


Switch1 SVI: 192.168.12.81
Switch2 SVI : 192.168.12.82

in this case what would be the ESX Host default Gateway ?

Thank you
jskfanAsked:
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JustInCaseCommented:
Typically it is use case for FHRP (e.g HSRP, VRRP , GLBP).
2 different IP addresses would be configured under SVI's and for gateway would be configured virtual IP address.
SW1
interface vlan 10
 ip address 192.168.12.81 255.255.255.0
 standby 10 ip 192.168.12.85
 standby 10 priority 120
 standby 10 preempt delay minimum 60

Open in new window

SW2
interface vlan 10
 ip address 192.168.12.82 255.255.255.0
 standby 10 ip 192.168.12.85

Open in new window

So in this case IP address 192.168.12.85 would be used as default gateway. SW1 would be used as active default gateway and SW2 would be active if SW1 is not available for some reason.
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jskfanAuthor Commented:
On ESX Host, how would you configure your Default Gateway ? which IP address will be used as DG ? considering that ESX host has 2 Nics teamed up one is connected to a port in switch1 and the other is connected to a port in Switch2.
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JustInCaseCommented:
Standby IP address should be configured as default gateway (in above example 192.168.12.85).
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jskfanAuthor Commented:
Predrag Jovic,

I believe when you Team up the Nics on ESX Host  and assign them IP address , this IP will  be the IP address you configure on the ESX host itself (Management IP address) , you just need to plug both ends of the ethernet cables to the same VLAN on both switches.

I know this Question is Vmware + Networking.
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jskfanAuthor Commented:
But another Head Scratch, when IP address is configured on ESX host,  it will still need DG... Wonder to which IP address the DG should point to ?

My Guess is   the switches that the teamed up Nics are connected to do not use SVI, and they are connected to the same L3 switch and same VLAN in the back  that will be configured with SVI and IP address that will be the DG for ESX host.
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jskfanAuthor Commented:
Thank you
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JustInCaseCommented:
You're welcome.
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