dual vlt stacks in one environment with vrrp

Question

Hi People,

Is this the right place to get some validation on a configuration?

The deployment scenario is basically this:

Top pair has trunked connections from 3 x esxi servers (VSS switches with multiple VLAN networks) and bottom pair has connection out the the rest of the network for the multiple VLAN's

So, I have 4 x S4112F-ON switches installed in one rack in adjacent RU's (top pair, bottom pair). Both pairs are connected EW via 2 x 100Gb (1/1/13-1/1/14) ports to form a VLTi - the top pair and bottom pair are configured with different VLT mac's and Domain's. The top VLT pair and bottom VLT pair are connected NS to each other using 4 x 10Gb (1/1/1-1/1/4) port's configured as a trunk with vlt-port-channel which all vlans are allowed. Each individual switch's has the same VLAN interface configuration with sequential ip addresses and one vrrp-group and a common vrrp virtual-address for each VLAN. The top left switch has a priority set and is the master the other 3 are slave. Using static routes. Attached is the basic layout.

Switch Setup VRRP.png

I can upload sanitised configs all all switches if it make it easier.

Regards,

Lee.

DELL-Josh Cr · Answer

Hi Lee,   It looks like a good config. Let us know if you run into any issues when setting it up.

leecha · Answer

Thanks Josh

FlabbyPanda · Answer

Sorry to bump such an old thread but I've inherited and identical design and am having trouble getting traffic going over the vrrp between sites. Did you have any issues with this?

At the moment on site A (left side) there are existing vrrp/vlans working fine. On site B (right side) we are trying to create new vrrp/vlans but I can only get it working if I create the vrrp/vlans on site A and just create regular vlans on site B. This isn't ideal since the specific workloads exist in site B only.

DELL-Erman O · Answer

Hi,

I'm not sure what cause it not working on site B. Please checking the configuration of the switches on site B to ensure they are properly configured for VRRP and VLANs. Verify that the VRRP group and virtual address are correctly set up on site B switches. Additionally, check the network connectivity between the switches on site B and ensure there are no issues with the trunk connections or VLT configuration. Or might be thread owner reply it.

FlabbyPanda · Answer

Thanks Erman, connections are good as traffic flows once we set vlans without vrrp on site B. I've seen some documentation suggesting that we need eVLT configured (but I can't find the documentation on how to actually do this) between the 2 sites.

DELL-Erman O · Answer

Please take a look below steps. I could find a general outline:

- Log in to the CLI (Command Line Interface) of each switch using SSH or a serial connection.
- Enter configuration mode by typing configure.
- Create the eVLT domain by typing evlt domain <domain-id>.
- Assign the appropriate ports to the eVLT domain. For example, you can use the evlt port-channel <port-channel-id> command to add the 100Gb ports (1/1/13-1/1/14) to the eVLT domain.
- Exit configuration mode by typing exit and save the configuration using the copy running-config startup-config command.
Verify the eVLT configuration by checking the status of the eVLT domain and ensuring that the ports are correctly assigned. You can use the show evlt domain <domain-id> command to view the status and configuration details of the eVLT domain.

FlabbyPanda · Answer

evlt is not a recognised command when I try it on my switches. They are Z9264F-ON running 10.5.4.3

DELL-Charles R · Answer

Hello,

There is not a eVLT command. eVLT is a “design” that combines 2 VLT domains in one so that Virtual machines and migrate across data centers transparently.

The Dell OS10 User Guide has a sample configuration for eVLT from page 1741

https://dell.to/44g5b4w

In this example Data Center 1 is (C1, D1), Data Center 2 is (C2, D2), connected in eVLT.

A few things to note that may be wrong:

-In that example the vlan 100 in in all 4 core switches.

-The VLT Port-channel 10 that carries that vlan 100 cross connects the 4 switches (switch C1 has one link going to C2 and the other to D2 and so on). The diagram in this post does not show cross connection.

-These are 2 separate domains 10 and 20, each domain has the same vlt mac between its 2 switches

-peer-routing is enabled under the VLT domain config

-the vrrp-group 10 is the same on all switches for vlan 100.

-for L3 there is OSPF that is redistributing connected routes.

Networking General

dual vlt stacks in one environment with vrrp

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