• Author : Aniket Bhowmick


EVPN Multicast OISM Scenarios

Objective The objective of this article is to understand how EVPN OISM (Optimised Inter Subnet Multicast) operates in certain scenarios/designs and understanding the logical flow. This article is best suited if you have already read the below TOI and have some trouble understanding how it would work in real world: https://eos.arista.com/eos-4-25-1f/multicast-evpn-irb/ Scenarios Scenario 1 Topology In above topology, host Sender multicast traffic is in Vlan 10 connected to VTEP-1 and Receiver is Vlan 20, connected to VTEP-2. Please ignore VTEP-3 for now. Vxlan Configuration On both VTEP-1 and VTEP-2 (showing output only for VTEP-1): BGP Configuration VTEP-1 BGP Underlay neighbour...
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Platform Specific Discards

Objective This document is a guide to understand “input/output” discards (or congestion related drops) on various platforms and how to troubleshoot them. Introduction The term “Discards” in the world of Arista Networks refers to packets being dropped due to congestion- either on CPU level or interface level. Any other kind of drops , like drops due to- “Vlan not being allowed”, “route lookup failure”, “Incorrect Hardware state”, etc are not considered as “Discards” and are mostly considered as “Packet Processor” drops. Platforms to be covered 7050, 7060, 7260 and 7304 series 7280R, 7020R, 7500R series 7150 What is an Output...
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Troubleshooting based on Control Plane Policing (CoPP) for 7500R, 7280R, 7020R Platforms

Objective This article is going to explain few important Copp queues of Arista platforms- 7280 series, 7020 series, 7500 series that are responsible for handling various control-plane packets and how to troubleshoot based on that.  Copp or Control Plane Policing are various queues or buffers in Arista switches for handling various plane packets. Different Copp handles different kinds of control-plane packets and each has its own significance. The control plane policing (CoPP) feature increases security on the switch by protecting the CPU from unnecessary or DOS traffic and giving priority to important control plane traffic.. It also segregates different Control-plane...
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Virtual IPs in Vxlan and need for vVTEP

Objective Objective of this Document is to contrast the differences in the behaviour of “ip address virtual” and “ip virtual-router address” in VxLan and to understand the need for virtual VTEP IP (VVTEP) with or without L2 VTEP in a network. Topology VXLAN Direct Routing Model Virtual IP in SVI 100: Virtual IP in SVI 200: Virtual MAC: 0011.2233.4455 Virtual VTEP IP (VVTEP): Underlay Protocol used: OSPF Types of Virtual IPs: Types of Virtual IPs usually configured with Vxlan: 1) ip virtual-router address 2) ip address virtual RULE-1 : If ethernet source MAC of original/naked frame is...
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