Dell PowerSwitch S5212F-ON OS10 Enterprise Edition User Guide Release 10.4.3.0 - Page 688
DHCP relay on VTEPs
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OS10 Switch scaled-overlay-routing S52xx-ON series: default-overlay-routing disable-overlay-routing balanced-overlay-routing scaled-overlay-routing S4248-ON: default-overlay-routing Overlay nexthop entries 40960 Underlay nexthop entries 8192 Overlay L3 RIF entries 8192 Underlay L3 RIF entries 10240 - 8192 0 32768 53248 - 57344 65536 32768 12288 - 2048 0 8192 12288 - 14336 16384 8192 4096 - 20480 - 110592 - 4096 - 28672 NOTE: The S4248-ON switch supports only one default profile to reserve resources for overlay ARP entries. To activate the profile after you configure an overlay routing profile, save the configuration and reload the switch. Configure an overlay routing profile • Enable an overlay routing profile in Configuration mode or disable the configured profile and return to the default. OS10# hardware overlay-routing-profile {disable-overlay-routing | balanced-overlay-routing | scaled-overlay-routing} Display overlay routing profiles • View the hardware resources available for overlay routing in different profiles; for example, in the S5200-ON series: OS10# show hardware overlay-routing-profile mode all Mode Overlay Next-hop Underlay Next-hop Entries Entries default-overlay-routing 8192 57344 disable-overlay-routing 0 65536 balanced-overlay-routing 32768 32768 scaled-overlay-routing 53248 12288 Overlay L3 RIF Entries 2048 0 8192 12288 Underlay L3 RIF Entries 14336 16384 8192 4096 • View the currently configured overlay routing profile; for example, in the S5200-ON series: show hardware overlay-routing-profile mode Overlay Setting Mode Next-hop Entries Current default-overlay-routing 8192 Next-boot default-overlay-routing 8192 Underlay Next-hop Entries 57344 57344 Overlay L3 RIF Entries 2048 2048 Underlay L3 RIF Entries 14336 14336 DHCP relay on VTEPs Dynamic Host Configuration Protocol (DHCP) clients on hosts in the overlay communicate with a DHCP server using a DHCP relay on the VTEP switch. In OS10, DHCP relay is supported on VTEPs only if you locate the DHCP server in the underlay network. To work seamlessly, VTEP DHCP relay transmits the virtual-network IP address of the relay interface to the DHCP server. By default, DHCP uses the giaddr packet field to carry these addresses to the server. In a VxLAN, which has overlay and underlay subnets in the same default VRF, DHCP relay on VTEPs operates without user intervention. However, in a VXLAN in which the underlay and overlay are in different VRFs, the default DHCP method is not successful. The IP tenant subnet is in the overlay address space. The IP address where the VTEP is reachable is in the underlay address space. To transmit the IP subnet of the client separately from the IP address where the VTEP is reachable, you must configure an additional DHCP sub-option (5 or 151) in DHCP relay agent option 82. Because OS10 does not support the required sub-options in DHCP relay agent option 82, the giaddr packet field must contain the virtual-network IP address of the relay interface, and this IP address must be reachable from the DHCP server in the underlay. Each VTEP 688 VXLAN
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