• Author : Deepan Jayaraj


Arista Fabric Integration with Microsoft Network Load Balancing

Overview This article provides a brief introduction and configuration of Microsoft NLB with Arista L2LS (without VxLAN) and L3LS VxLAN fabric setup to avoid the most common issues during the deployments. NLB Introduction The Network Load Balancing (NLB) feature distributes traffic across several servers by using the TCP/IP networking protocol. By combining two or more computers that are running applications into a single virtual cluster, NLB provides reliability and performance for web servers and other mission-critical servers. Three modes of operation in NLB Unicast All the NICs assigned to a Microsoft NLB cluster share a common MAC address. The MAC...
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EVPN S-IRB in Default VRF (Type-2 & Type-5 routes)

Description This feature provides a mechanism to export default VRF routes into EVPN and advertise them as EVPN type-5 IP Prefix routes. Using Host route Injection (HRI), the /32 routes will be advertised as EVPN type-2 mac-ip routes. Platform compatibility DCS-7020R DCS-7260X/7260X3 DCS-7050/7050X/7050X2 DCS-7060X/7060X2 DCS-7160 DCS-7250 DCS-7500R/7500R2/7500E DCS-7300X/DCS-7320X Topology Note: Both SVI 10 & 20 Subnets are present on VTEP1 whereas in VTEP2 there is no SVI 20 only has SVI 10. SVI 10 is in non-default (vrf core) VRF. SVI 20 is in default VRF (which we are interested in this doc) Configuration Step 1) Configure the VNI for...
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Troubleshooting EVPN IRB with VXLAN

Overview This article provides a brief introduction to EVPN IRB with VXLAN along with basic debugging methods for the same. Introduction Ethernet VPN (EVPN) is an extension of the MP-BGP protocol introducing a new address family. EVPN is used as a control-plane for VXLAN environments to exchange information such as MAC addresses and ARP bindings along with VTEP flood list. Additionally,  IP prefixes can be exchanged in the overlay using Type-5 routes.  Platform Compatibility The below table captures the EVPN IRB support for a few Arista platforms: on the platforms listed below:   Platform Feature Support EOS Release 7050X/ 7300X/...
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Dot1q tagged LACPDU

Introduction This document provides details on how 802.1Q tagged LACP packets are handled on our Arista device. 802.1Q tagged LACP PDUs The LACP PDU frames were ingressing from other vendors into an Arista switch with an 802.1Q tag and designated as VLAN 0. 10:03:58.521076 58:ac:78:f2:8c:05 > 01:80:c2:00:00:02, ethertype 802.1Q (0x8100), length 128: vlan 0, p 0, ethertype Slow Protocols, LACPv1, length 110 10:03:59.421028 58:ac:78:f2:8c:05 > 01:80:c2:00:00:02, ethertype 802.1Q (0x8100), length 128: vlan 0, p 0, ethertype Slow Protocols, LACPv1, length 110 Natively, EOS discards tagged LACP PDUs as they are out of spec. These discards can be observed using the...
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LACP Rate Fast

Introduction The LACP rate fast feature is used to set the rate (once every second) at which the LACP control packets are sent from partner. The normal rate at which LACP packets are sent is 30 seconds. This document provides workflow of the LACP rate fast feature including the packet capture and some recommendations/concerns in MLAG setup. How it works When LACP is synchronizing between two device LACP PDUs are sent at a rate of 1 per second until both sides are synchronized. Once this is complete they are sent at a rate of 1 per 30 seconds. LACP Rate...
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