Perform this procedure to change the maximum number of VRFs and Layer 3 VSNs that the switch supports. Increasing the number of VRFs or Layer 3 VSNs can be useful in a WAN scenario or other large network.
The maximum number of supported VRFs and Layer 3 VSNs differs depending on the hardware platform. For more information about maximum scaling numbers, see Fabric Engine Release Notes.
Important
If you enable this boot config flag, and the switch operates in SPBM mode (default configuration), the switch reduces the number of configurable VLANs. In such a configuration, the switch reserves VLANs 3500 to 3998 for internal use. You cannot use these VLANs as either platform VLANs or B-VLANs. You can still use the reserved VLAN range for customer VLANs (C-VLAN) on Flex UNI and B-VLANs on FE-VID.
If the switch operates in SPBM mode, before you enable the boot config flag, perform the following actions:
Check in-VLAN filters. If a filter references a VLAN in the 3500 to 3998 range, you must delete the filter or the filter configuration fails when you restart the switch.
Delete VLANs in the 3500 to 3998 range.
Enable the boot config flag to increase the maximum number of VRFs and Layer 3 VSNs. In the following example, the switch operates in SPBM mode and reserves the VLAN ID range of 3500 to 3999. If the switch does not operate in SPBM mode, the system does not display the VLAN warning message when you enable VRF scaling.
Switch:1>en
Switch:1#configure terminal
Enter configuration commands, one per line. End with CNTL/Z.
Switch:1(config)#boot config flag vrf-scaling
Warning: Vlan 3500 to 3999 will be reserved for internal use.
Warning: Please save the configuration and reboot the switch
for this configuration to take effect.
Note
Flag support can vary across hardware models.
Switch:1#show boot config flags flags advanced-feature-bandwidth-reservation low flags block-snmp false flags debug-config false flags debugmode false flags dvr-leaf-mode false flags enhancedsecure-mode false flags factorydefaults false flags flow-control-mode true flags ftpd true flags hsecure false flags ipv6-egress-filter true flags ipv6-mode false flags logging true flags macsec false flags nni-mstp false flags reboot true flags spanning-tree-mode mstp flags spbm-config-mode true flags spbm-node-scaling true flags sshd true flags syslog-rfc5424-format true flags telnetd true flags tftpd true flags trace-logging false flags urpf-mode true flags verify-config true flags vrf-scaling true
The following example shows the message that the system displays it if you try to enable the boot config flag and configured VLANs use IDs between 3500 and 3999.
Switch:1>en Switch:1#configure terminal Enter configuration commands, one per line. End with CNTL/Z. Switch:1(config)#boot config flag vrf-scaling Error: Delete all configured platform vlans between 3500 and 3999 to enable vrf-scaling.