A Cumulus Linux switch always provides at least one dedicated Ethernet management port called eth0. This interface is specifically for out-of-band management use. The management interface uses DHCPv4 for addressing by default.
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You can generate authentication keys to access a Cumulus Linux switch securely with the ssh-keygen component of the Secure Shell (SSH) protocol. Cumulus Linux uses the OpenSSH package to provide this functionality. This section describes how to generate an SSH key pair.
Cumulus Linux supports 802.1Qaz, Enhanced Transmission Selection, which allows the switch to assign bandwidth to egress queues and then schedule the transmission of traffic from each queue. 802.1Qaz supports Priority Queuing.
Cumulus Linux supports two levels of hierarchical traffic shaping: one at the egress queue level and one at the port level. This allows for minimum and maximum bandwidth guarantees for each egress-queue and a defined interface traffic shaping rate.
If you define a queue minimum shaping value of 0, there is no bandwidth guarantee for this queue. The maximum queue shaping value must not exceed the interface shaping value defined by port.shaper. The port.shaper value must not exceed the physical interface speed.
RoCEv2 requires flow control for lossless Ethernet. RoCEv2 uses the Infiniband (IB) Transport Protocol over UDP. The IB transport protocol includes an end-to-end reliable delivery mechanism and has its own sender notification mechanism.
Linux bonding provides a method for aggregating multiple network interfaces (slaves) into a single logical bonded interface (bond). Link aggregation is useful for linear scaling of bandwidth, load balancing, and failover protection.
The peer link carries little traffic when compared to the bandwidth consumed by data plane traffic. In a typical MLAG configuration, most connections between the two switches in the MLAG pair are dual-connected; the only traffic going across the peer link is traffic from the clagd process and some LLDP or LACP traffic. The switch does not forward traffic received on the peer link out of the dual-connected bonds.
Determine how much bandwidth is traveling across the single-connected interfaces and set half of that bandwidth to the peer link. On average, one half of the traffic destined to the single-connected host arrives on the switch directly connected to the single-connected host and the other half arrives on the switch that is not directly connected to the single-connected host. When this happens, only the traffic that arrives on the switch that is not directly connected to the single-connected host needs to traverse the peer link.
When planning for link failures for a full rack, you need only set enough bandwidth to meet your site strategy for handling failure scenarios. For example, for a full rack with 40 servers and two switches, you can plan for four to six servers to lose connectivity to a single switch and become single connected before you respond to the event. Therefore, if you have 40 hosts each with 20G of bandwidth dual-connected to the MLAG pair, you can set between 20G and 30G of bandwidth to the peer link, which accounts for half of the single-connected bandwidth for four to six hosts. 2ff7e9595c
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