SONiC automation flow

 


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eBGP sonic lab + Ansible config & validation

#Containerlab root@digi-oss:/home/labadmin/mohan/sonic2# cat sonic-evpn.clab.yml name: sonic-evpn topology:   nodes:     spine:       kind: sonic-vs       image: docker-sonic-vs:latest     leaf1:       kind: sonic-vs       image: docker-sonic-vs:latest     leaf2:       kind: sonic-vs       image: docker-sonic-vs:latest     host1:       kind: linux       image: alpine:latest     host2:       kind: linux       image: alpine:latest   links:     - endpoints: ["leaf1:eth1","spine:eth1"]     - endpoints: ["leaf2:eth1","spine:eth2"]     - endpoints: ["leaf1:eth2","host1:eth1"]     - endpoints: ["leaf2:eth2","host2:eth1"] root@digi-oss:/home/labadmin/mohan/sonic2# containerlab destroy -t sonic-evpn.clab.yml root@digi-oss:/home/labadmin/mohan/sonic2#...
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SONiC-2

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  1.SONiC Architecture - Layers Layer                What it does           Speed           Analogy 1.User Space        Logic, protocols   Slow              Brain 2.Kernel Space        OS networking           Medium        Nervous system 3.Hardware        Packet forwarding   Very fast        Muscles Big Picture User Space  →     Kernel Space  →  Hardware (SONiC apps)      (Linux OS)            (ASIC) a. User Space (SONiC Layer) - This is where SONiC containers + daemons run Includes: swss → orchagent, vlanmgrd, etc. bgp → bgpd, zebra teamd, lldp, snmp Redis (database container) Role: Process configs Run routing protocols Decide what...
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RDMA RoCE

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  INCAST Spectrum-X switches Bluefield DPUs Flow level loadbalancing vs packet level loadbalancing (spraying) Leads to out-of-order  NVIDIA's RoCE (RDMA over Converged Ethernet) RDMA HPC - high performance computing Need for - high speed low latency connections  Eveyday internet use TCP/IP not good for this Application > OS > TCP/IP stack > NIC card (CPU intence) - adds latency RDMA Approach -rNIC offlocading (OS,stack) 1.Infiniband (dedicated nw switch & nic) 2.iWARP - internet wide area RDMS protocol (need iWARP capablie NICs) 3a.RoCE 3b.RoCEv2 (UDP+IP packets) for RDMA lossless is must *traditional ethernet is lossy when there is a congestion 1.MTU 2.QoS - prioritse roce packet dscp 3.PFC - priority flow control    Network switch (receving switch send a pause frame to sending switch , this will make sending switch to stop sending for some time)    this will help in lossless transaction but intraduce Head-of-line-blocaking  4.DCQCN ...
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