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Introduction vtun Example stackoverflow macvlan/macvtap Introduction TUN/TAP provides packet reception and transmission for user space programs. It can be seen as a simple Point-to-Point or Ethernet device, which, instead of receiving packets from physical media, receives them from user space program and instead of sending packets vi...

localport ovn 中localport的端口代表本地端口，这种端口只能与本chassis中的其他端口通信. 另外也可以通过localnet与external port通信。 A localport logical switch port is a special kind of VIF logical switch port. These ports are present in every chassis, not bound to any par‐ ticular one. Traffic to such a port will never be forwarded through a tunnel, and traff...

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VF LAG # https://bugzilla.redhat.com/show_bug.cgi?id=1642355#c13 1. Feature description: i. High Availability and load balancing for Virtual Functions of different physical ports in Switchdev mode. 2)Precondition: a. Need to create at least 1 VF on both Physical port and unbind the VF’s b. Mov...

HUAWEI CISCO IEEE Introduction Link Aggregation Control Protocol (LACP), LACP, as specified in IEEE 802.3ad, implements dynamic link aggregation and de-aggregation, allowing LACP-enabled switches at both ends to exchange Link Aggregation Control Protocol Data Units (LACPDUs). LACP provides a standard negotiation mechanism that a Huawei swi...

Red Hat Enterprise Linux Network Performance Tuning Guide how to tune your 100G host 100g Network Adapter Tuning PACKET RECEPTION IN THE LINUX KERNEL What is the relationship of DMA ring buffer and TX/RX ring for a network card? https://stackoverflow.com/questions/47450231/what-is-the-relationship-of-dma-ring-buffer-and-tx-rx-ring-for-a-netw...

kdump kdump early kdump grubby # config kdump # install kexec-tools package: yum install kexec-tools # The option crashkernel must be added to the kernel command line parameters in order to reserve memory for the kdump kernel: grubby --update-kernel=ALL --args="crashkernel=256M" # The location of the kdump vmcore can be specified in /etc/k...

External Port可以为外部端口提供DNS等服务。 install vms install two vms on both node rhel_version=rhel$(rpm -E %rhel) # libvirt && kvm yum -y install virt-install yum -y install libvirt yum install -y python3-lxml.x86_64 rpm -qa | grep qemu-kvm >/dev/null || yum -y install qemu-kvm if (($rhel_version < 7)); then service libvirtd rest...