https://www.juniper.net/documentation/en_US/junos/topics/concept/vcf-components.html
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3- Plug and play for the Leaves ( discover Neighbor and number of links and aggregate links auto)
4- ISSU
5- VxLAN L2 gw
VCF any port ? ( VC use backplane cable )
support NSSU on QFX5110 VCF in 19.3
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