H3C S5560X-EI Series Configuration Manual

Also see for S5560X-EI Series: Command reference Installation guide

Contents

H3C S5560X-EI Series Configuration Manual Manual pdf 20 page image

14Setting the destination UDP port number ofVXLAN packetsStep Command Remarks1. Enter system view. system-view N/A2. Set a destination UDPport for VXLAN packets. vxlan udp-port port-numberBy default, the destination UDP portnumber is 4789 for VXLAN packets.You must configure the samedestination UDP port number on allVTEPs in a VXLAN.If you modify the destination UDP portnumber, only VXLAN tunnelsestablished after the modification usethe new port number for sending VXLANpackets. For the new port number totake effect on VXLAN tunnels createdbefore the modification, you mustdisconnect and re-establish the tunnels.Enabling ARP flood suppressionUse ARP flood suppression to reduce ARP request broadcasts.The aging timer is fixed at 25 minutes for ARP flood suppression entries. If the suppression table isfull, the VTEP stops learning new entries. For the VTEP to learn new entries, you must wait for oldentries to age out, or use the reset arp suppression vsi command to clear the table.If the flooding disable command is configured, set the MAC aging timer to a higher value than theaging timer for ARP flood suppression entries on all VTEPs. This setting prevents the trafficblackhole that occurs when a MAC address entry ages out before its ARP flood suppression entryages out. To set the MAC aging timer, use the mac-address timer command.When remote ARP learning is disabled for VXLANs, the device does not use ARP flood suppressionentries to respond to ARP requests received on VXLAN tunnels.To enable ARP flood suppression:Step Command Remarks1. Enter system view. system-view N/A2. Enter VSI view. vsi vsi-name N/A3. Enable ARP floodsuppression. arp suppression enable By default, ARP flood suppressionis disabled.Disabling remote ARP learning for VXLANsBy default, the device learns ARP information of remote user terminals from packets received onVXLAN tunnel interfaces. To save resources on VTEPs in an SDN transport network, you cantemporarily disable remote ARP learning when the controller and VTEPs are synchronizing entries.After the entry synchronization is completed, use the undo vxlan tunnel arp-learning disablecommand to enable remote ARP learning.