In the process of building a small network across three DC locations. Each DC is using 2x VSP4900’s in each location as a RSMLT cluster. Intend on using DVR across each of the sites, predominantly based on the details provided in the Automated Campus Extreme Evaluated Design.
- We are only using DVR controllers, no leaf nodes. is DVR still Ok to use in this scenario
- When I enable the vrf-scaling boot flag, which I’m prompted to do when entering the command ‘dvr controller 100’ you get the following message:
Warning: Vlan 3500 to 3998 will be reserved for internal use.
Warning: Vrf-scaling boot flag is enabled on DVR Node, make sure it is enabled
on all DVR Nodes in domain.
Warning: Please save the configuration and reboot the switch
for this configuration to take effect.
Do you know if that’s normal? This is potentially a problem pinching those VLAN ID’s that could already be in use i.e. doing a migration or certainly good to know prior to building the network.
Do you know why it needs them and why it reserves so many?
Best answer by Miguel-Angel RODRIGUEZ-GARCIA
Per documentation:”On switches that support the vrf-scaling and spbm-config-mode boot configuration flags, if you enable these flags, the system also reserves VLAN IDs 3500 to 3998”
So, yes it is normal.
the why is because the system needs to reserve resources and the memory an CPU is limited.
So cannibalising the other resources is a way to achieve a higher number of VRFs (requiring a higher number of resources).
If the VLANs already exists elsewhere, you can map them in an I-SID and change the VLAN id in your core